Facilitating Green Supply Chain in Dental Care through Kansei Healthscape of Positive Emotions

Dentistry is highly energy- and resource-intensive with a significant environmental impact. To consolidate green dentistry supply chains, delivering the care of highest quality that meets client value should not be neglected. This study emphasized the importance of client-centered healthscape design for facilitating a green dentistry supply chain. A client-centered healthscape design, which promotes clients’ positive emotions and increases willingness to revisit the dentist, plays a critical role in realizing green dentistry supply chains in the long run. For this purpose, the relationship among dental healthscape design elements, client emotions, and revisit intentions was investigated using a Kansei engineering-based approach. The effects of dental healthscape elements on clients’ positive emotions and the effects of positive emotions on clients’ revisit intentions were holistically examined on the basis of the stimulus–organism–response model. Through this approach, 17 elements of design, ambience, and social interaction factors that comprise the dental healthscape and 20 Kansei words used to express clients’ positive emotions regarding dental service were identified. A questionnaire survey was used to assess Kansei and revisit intention in healthscape scenarios, composed of varied design elements. Primary data were collected from 600 individuals from 2017 to 2018 throughout Taiwan. Partial least squares was applied to holistically analyze the effects of dental healthscape elements on clients’ positive emotions and the effects of positive emotions on clients’ revisit intention to generate a Kansei model for the dental healthscape. All 20 Kansei words had significant positive effects on the dental revisit intention of clients. The five positive emotions most associated with increased revisit intention were thoughtful, hopeful, tender, comfortable, and cozy. The Kansei model of the dental healthscape provides references for healthscape design that maintains positive client emotions during the dental service and results in high revisit intention. This approach can realize an emotion-centered design for dental healthscapes that promotes preventive dental care, early treatment, and effective use of medical resources, and consequently contributes to green dentistry supply chains.


Introduction
A supply chain is a system of organizations, people, information, and resources involved directly or indirectly in different activities that produce value in the form of physical goods or services delivered from supplier to the ultimate consumer [1]. Services, unlike physical goods, are intangible, perishable, and heterogeneous, and often involve customers as active participants in the production process. The implication is that all services have customers as primary suppliers of inputs, which is the customer-supplier duality [2]. Converting or creating value for customers in services always involves the customers actively; customers are often co-producers. Customer-introduced variability Dentistry is highly energy-and resource-intensive with a significant environmental impact. Factors inherent in the profession, such as enormous electricity demands of electronic dental equipment, voluminous water requirements, environmental effects of biomaterials (before, during, and after clinical use), the use of radiation, and the generation of hazardous waste all contribute towards this [8]. Adoption of eco-design practices [9] and environmentally friendly measures has been emphasized and studied in the literature [8,12,13]. To consolidate green dentistry supply chains, delivering the care of highest quality which meets client value should not be neglected. For this purpose, the element of positive experience, which is formed by customizing treatment to client needs, and the element of safe care, by which clients are protected from physical, psychological, or emotional harm, should be added in the building of green clinical care [8].
Oral condition greatly affects physical health, mental health, and quality of life [19][20][21]. Barriers to dental care for many people include anxiety, cost considerations, perceived needs, and lack of access [22]. In Taiwan, since the implementation of national health insurance in 1995, citizens have had a high-quality, easily accessible, and low-expense medical care system. Although the promotion of preventive care, early treatment, and regular use of dental services have become easier, eliminating clients' anxiety and fear remains a challenge [23][24][25][26]. However, this strongly affects clients' perceived value. The main reason for people to visit the dentist is to relieve oral discomfort, but many people delay treatment when experiencing fear and anxiety [27,28]. This worsens the oral condition, increases the treatment complexity and time, and decreases ultimate patient satisfaction [23,29]. Consequently, more resources, chemicals, and drugs will be used, and waste will be generated, all of which are indirectly harmful to the environment.
Fear, as defined in the Cambridge dictionary, is an unpleasant emotion or thought that people have when they contemplate something potentially dangerous or painful. Anxiety is an uncomfortable feeling of nervousness about something that is happening or may happen, or it may be defined as an adverse or irrational reaction to an unknown future [30]. The fear of painful experiences may exacerbate the anxiety of visiting the dentist [31,32]. Research discovered that people with a high level of conscious anxiety appeared to be more susceptible to pain before, during, and after dental treatment [28]. Excessive negative emotional responses to specific procedures or the environment of dental treatment have made people reluctant to use dental services [33,34].
Emotions are generated when an individual assesses the personal meaning of some antecedent event, environment, relationship, or encounter. This appraisal process may be either conscious or Oral condition greatly affects physical health, mental health, and quality of life [19][20][21]. Barriers to dental care for many people include anxiety, cost considerations, perceived needs, and lack of access [22]. In Taiwan, since the implementation of national health insurance in 1995, citizens have had a high-quality, easily accessible, and low-expense medical care system. Although the promotion of preventive care, early treatment, and regular use of dental services have become easier, eliminating clients' anxiety and fear remains a challenge [23][24][25][26]. However, this strongly affects clients' perceived value. The main reason for people to visit the dentist is to relieve oral discomfort, but many people delay treatment when experiencing fear and anxiety [27,28]. This worsens the oral condition, increases the treatment complexity and time, and decreases ultimate patient satisfaction [23,29]. Consequently, more resources, chemicals, and drugs will be used, and waste will be generated, all of which are indirectly harmful to the environment.
Fear, as defined in the Cambridge dictionary, is an unpleasant emotion or thought that people have when they contemplate something potentially dangerous or painful. Anxiety is an uncomfortable feeling of nervousness about something that is happening or may happen, or it may be defined as an adverse or irrational reaction to an unknown future [30]. The fear of painful experiences may exacerbate the anxiety of visiting the dentist [31,32]. Research discovered that people with a high level of conscious anxiety appeared to be more susceptible to pain before, during, and after dental treatment [28]. Excessive negative emotional responses to specific procedures or the environment of dental treatment have made people reluctant to use dental services [33,34].
Emotions are generated when an individual assesses the personal meaning of some antecedent event, environment, relationship, or encounter. This appraisal process may be either conscious or unconscious, and it triggers a series of reactional tendencies, such as subjective experience, cognitive processing, and physiological changes [35]. Emotions play a significant role in promoting customer satisfaction and loyalty, both in product and service experience [36]. Negative emotions, such as fear and anxiety, lead to specific fight-or-flight responses, making an individual's thought-action repertoires narrower than those in a neutral state [35]. By contrast, the broaden-and-build theory of positive emotions suggests that positive emotions can broaden an individual's awareness; encourage novel, varied, and exploratory thoughts and actions; help build lasting personal resources; and generate indirect and long-term adaptive benefits [37]. Research has demonstrated that positive emotions can improve parasympathetic cardiac control, benefit physical health [38], distract people from their pain, extend past happiness, and build energy to face threats and uncertainties [39,40]. Fear leads to escapism and anger that may provoke attacks, but positive emotional responses can lead to positive evaluations of a clinical experience [41]. Positive emotions can transform negative memories produced by bad experiences, expand thought, and create a positive experience that can extend to future visits, in a clinical context [39]. On the basis of the broaden-and-build theory of positive emotions, maintaining or arousing clients' positive emotions can not only increase their willingness to share information and actively participate in treatment, but also enhance their experience and improve their satisfaction [39,40,42,43].
Dental care is highly customized, and individual clinical consultations are usually longer than those in other medical fields [44]. During the course of diagnosis and treatment, patients have more opportunities to interact with and be affected by their perceptions of the dental healthscape. Correspondingly, the dental healthscape provides opportunities to improve patients' impressions of the dental treatment process and reduce patients' negative emotions. Kotler [45] believes that the "atmospherics" can be used to define the service environment space, wherein it is carefully designed so that a consumer who is in it can get a special emotional feeling. Originating from the concept of the servicescape, the healthscape is defined as the physical environment of healthcare services and refers to the tangibles experienced through senses such as sight, smell, sound, taste, and touch; the healthscape is believed to affect client perceptions, attitudes, satisfaction, and behavior [46][47][48][49]. To justify the relationship among dental healthscape, clients' emotions and behavior, the stimulus-organism-response (SOR) model [50] can be the theoretical foundation. The SOR model suggests that the environment stimulates the organism, and the organism, accepting such stimuli, produces through an internal process the final reactions of approach or avoidance [50]. Many studies have focused on the effects of the servicescape on consumer emotions and perceptions toward services, mainly hedonic services [51][52][53][54][55]. The servicescape affects an individual's emotional response, which, in turn, drives the individual to react in various ways, and similar findings have been reported for the healthscape. Pai and Chary [47] discovered that in a teaching hospital in India, the healthscape had a stronger influence on patients' behavioral intention than did overall service quality. Hermawan and Yusran [46] observed that atmospheric factors of dental clinics in Indonesia positively influenced patients' emotions and behavioral intentions. Sag et al. [49] reviewed the limited literature on the servicescape in healthcare settings and indicated significant positive associations between the healthscape and patient perceptions, satisfaction, and emotions. However, the study of the effects of the dental healthscape on clients' emotions and behavior is limited. Healthscape design can drive creation of positive client emotions during dental care services. Healthscape design is highly influential, but it has rarely been the focus of research [56]. Lin and Mattila [53] suggested that, following the concept of Gestalt, customers generally receive a variety of stimuli from the restaurant servicescape and view every encounter holistically, considering multiple aspects in their experience evaluation. Customer experience is holistic, encompassing every contact with a firm, so all service encounters need to be seamlessly orchestrated [57]. Accordingly, this study assumed clients to consider multiple atmospheric cues, tangible elements, and services of the healthscape. A comprehensive study of the dental healthscape's effect on clients' emotions and consequent behavior is required and will contribute to the dental care field.
Negative memories arouse uneasiness and anxiety [27]. When entering a dental clinic, people's emotions can be magnified or attenuated by the atmospherics of the healthscape. Client involvement should be a primary concern in the design of dental service processes, and all care practices should incorporate emotional factors, rather than focusing solely on technical compliance [58]. However, producing this synergy is challenging. The design of medical services varies from that of a manufactured product; medical service design focuses on not only the design of the service itself but the combined effects of the care elements and delivery processes. A client's perception of service design is a complex system [58]. Although methods, such as quality function development, the Kano model, and conjoint analysis, can help understanding customers' explicit needs, none of these adequately translate the effect of or implicit need for design parameters [59]. Kansei engineering (KE), an ergonomic methodology for consumer emotion-oriented design, analyzes consumer psychology and translates the results into product development [60]. As part of the Eastern psychological vocabulary, Kansei represents factors such as needs, wants, preferences, emotions, affections, and feelings. KE has been applied in various circumstances, including to the industrial design of cars, refrigerators, kitchen systems, toilets, and mattresses [61]; tourism service design [62]; logistics [63]; and airlines [64]. An emotion-oriented design of the dental healthscape may play a crucial role in reducing a client's anxiety during the care process and leaving a positive impression, which promotes future willingness to visit. KE advances the understanding of the individual and the integrated effects of healthscape design elements on clients' Kansei perception.
A positive atmosphere in a healthscape is consequential because it arouses people's positive emotions and encourages dental visits for regular oral examinations, thus promoting oral health. In this study, the assumed causal links between the dental healthscape and clients' emotions and revisit intentions were based on the SOR model, as illustrated in Figure 2. The three dimensions of the servicescape proposed by Hightower [65]-the dimensions of the design, ambience, and social interaction-were selected to define the design properties of a dental healthscape. Clients view every encounter holistically and consider multiple aspects in their experiences and emotional evaluations [53,57]. These evaluations are the psychological responses of clients to the combined outcomes of all properties of the healthscape. Studying the effects of a single property without considering others is insufficient. KE is an appropriate methodology for the comprehensive study of the main and combined effects of multiple properties. The KE methodology was used to analyze the effects of dental healthscape design properties on clients' emotional and behavioral responses. The purposes of this study were to firstly identify a comprehensive set of positive Kansei that will attract clients to dental services; secondly, to identify the healthscape elements of the dental service environment and analyze their effects on clients' Kansei; and thirdly, analyze the effects of clients' Kansei on their revisit intention. The results are intended to provide knowledge regarding which Kansei most positively affects client revisit intention and to indicate which healthscape design elements create these notable Kansei for the dental service environment. This knowledge can contribute to delivering the care of highest quality which meets client values, thus consolidating green dentistry supply chains. should be a primary concern in the design of dental service processes, and all care practices should incorporate emotional factors, rather than focusing solely on technical compliance [58]. However, producing this synergy is challenging. The design of medical services varies from that of a manufactured product; medical service design focuses on not only the design of the service itself but the combined effects of the care elements and delivery processes. A client's perception of service design is a complex system [58]. Although methods, such as quality function development, the Kano model, and conjoint analysis, can help understanding customers' explicit needs, none of these adequately translate the effect of or implicit need for design parameters [59]. Kansei engineering (KE), an ergonomic methodology for consumer emotion-oriented design, analyzes consumer psychology and translates the results into product development [60]. As part of the Eastern psychological vocabulary, Kansei represents factors such as needs, wants, preferences, emotions, affections, and feelings. KE has been applied in various circumstances, including to the industrial design of cars, refrigerators, kitchen systems, toilets, and mattresses [61]; tourism service design [62]; logistics [63]; and airlines [64]. An emotion-oriented design of the dental healthscape may play a crucial role in reducing a client's anxiety during the care process and leaving a positive impression, which promotes future willingness to visit. KE advances the understanding of the individual and the integrated effects of healthscape design elements on clients' Kansei perception. A positive atmosphere in a healthscape is consequential because it arouses people's positive emotions and encourages dental visits for regular oral examinations, thus promoting oral health. In this study, the assumed causal links between the dental healthscape and clients' emotions and revisit intentions were based on the SOR model, as illustrated in Figure 2. The three dimensions of the servicescape proposed by Hightower [65]-the dimensions of the design, ambience, and social interaction-were selected to define the design properties of a dental healthscape. Clients view every encounter holistically and consider multiple aspects in their experiences and emotional evaluations [53,57]. These evaluations are the psychological responses of clients to the combined outcomes of all properties of the healthscape. Studying the effects of a single property without considering others is insufficient. KE is an appropriate methodology for the comprehensive study of the main and combined effects of multiple properties. The KE methodology was used to analyze the effects of dental healthscape design properties on clients' emotional and behavioral responses. The purposes of this study were to firstly identify a comprehensive set of positive Kansei that will attract clients to dental services; secondly, to identify the healthscape elements of the dental service environment and analyze their effects on clients' Kansei; and thirdly, analyze the effects of clients' Kansei on their revisit intention. The results are intended to provide knowledge regarding which Kansei most positively affects client revisit intention and to indicate which healthscape design elements create these notable Kansei for the dental service environment. This knowledge can contribute to delivering the care of highest quality which meets client values, thus consolidating green dentistry supply chains.

Methods
KE is a method to convert customers' ambiguous impressions about products into a detailed product design and to provide designers with guidance for product development in accordance with customers' Kansei. KE helps customers choose from a variety of designs that fit their Kansei. The methodology of KE includes a psychological evaluation experiment followed by multivariate analyses. According to Schutte et al. [66], implementation of KE begins with determining the research domain, which includes defining the intended target group, user type, market niche, and product group. The second step spans the Kansei semantic space, a collection of numerous Kansei words or expressions to describe the specific domain. The third step spans the property space by identifying product properties that represent the domain and selecting key features for further evaluation. In the fourth step, Kansei evaluation experiments are conducted to synthesize semantic and property spaces. This is commonly implemented through customer perception surveys in which customers evaluate product examples composed of key features in the property space using all of the Kansei words in the semantic space. Finally, the effects of the product features on the Kansei are determined from the survey data. Once the effects are validated, a recommendation model is generated to guide the Kansei design of a particular product.
The proposed application of a KE-based approach to dental healthscape design comprises six steps, which are illustrated in Figure 3 and detailed as follows. KE is a method to convert customers' ambiguous impressions about products into a detailed product design and to provide designers with guidance for product development in accordance with customers' Kansei. KE helps customers choose from a variety of designs that fit their Kansei. The methodology of KE includes a psychological evaluation experiment followed by multivariate analyses. According to Schutte et al. [66], implementation of KE begins with determining the research domain, which includes defining the intended target group, user type, market niche, and product group. The second step spans the Kansei semantic space, a collection of numerous Kansei words or expressions to describe the specific domain. The third step spans the property space by identifying product properties that represent the domain and selecting key features for further evaluation. In the fourth step, Kansei evaluation experiments are conducted to synthesize semantic and property spaces. This is commonly implemented through customer perception surveys in which customers evaluate product examples composed of key features in the property space using all of the Kansei words in the semantic space. Finally, the effects of the product features on the Kansei are determined from the survey data. Once the effects are validated, a recommendation model is generated to guide the Kansei design of a particular product.
The proposed application of a KE-based approach to dental healthscape design comprises six steps, which are illustrated in Figure 3 and detailed as follows. Step 1: Choice of design domain The dental healthscape was the design domain of this study. Individuals over 20 years old having the experience of receiving dental care services were the target population of this study.
Step 2: Spanning the semantic space We established a Kansei vocabulary space corresponding to clients' possible positive Kansei regarding dental services. The Kansei words were identified from dental books, magazines, and online reviews. The KJ method (i.e., affinity diagram) [67] was implemented to establish the Kansei vocabulary. In the KJ method, seven experts were invited: a literature professor, a human resources lecturer, a financial consultant, an online writer, a social worker, an advertising planner, and a dentist. The KJ method utilized expert discussion for removing inappropriate words and grouping words of similar meanings. Any words that did not fit into a group were left to one side, forming a group of Step 1: Choice of design domain The dental healthscape was the design domain of this study. Individuals over 20 years old having the experience of receiving dental care services were the target population of this study.
Step 2: Spanning the semantic space We established a Kansei vocabulary space corresponding to clients' possible positive Kansei regarding dental services. The Kansei words were identified from dental books, magazines, and online reviews. The KJ method (i.e., affinity diagram) [67] was implemented to establish the Kansei vocabulary. In the KJ method, seven experts were invited: a literature professor, a human resources lecturer, a financial consultant, an online writer, a social worker, an advertising planner, and a dentist. The KJ method utilized expert discussion for removing inappropriate words and grouping words of similar meanings. Any words that did not fit into a group were left to one side, forming a group of their own. Finally, a word was picked from each group to represent that group, and to express clients' specific emotions toward the dental service process.
Step 3: Spanning the property space To establish a space of design elements for the dental healthscape, we referred to an American Dental Association publication [68] and the clinical experience of dentists to select some common dental healthscape designs as examples. Hightower [65] conceptualized the perceived servicescape using three fundamental dimensions of the physical environment: (1) design factors, referring to the visible or tangible elements in a servicescape that stimulate perception directly; (2) ambience factors, including the background environmental elements that exist outside of immediate perception; and (3) social interaction factors, referring to the people involved in the servicescape. According to Hightower's method [65], our dental healthscape design examples were deconstructed into their design elements. For example, the dentist's attire is a factor of design, music is a factor of ambience, and the manner in which the dentist chats with clients is a factor of social interaction. Finally, various common attributes were set for each design element. For example, the element of dentist attire comprised three possible attributes: dark casual clothes, a conventional white physician gown, or a blue surgery gown. A specific scenario for the dental healthscape can be generated by combining all of the design elements, each of which is presented by one selected attribute.
Step 4: Synthesis of the semantic space and property space This step involved synthesizing the semantic and property spaces to establish a link between them. One attribute of each element was selected and combined with those of other elements to generate a specific stimulus in KE. Each stimulus was a possible healthscape scenario for dental service. Various stimuli were generated using an orthogonal design method. Attributes of each element were incompatible and appeared with approximately even frequency across all generated stimuli. The semantic differential (SD) scale was used to evaluate the Kansei [69][70][71], producing a direct measurement of clients' affective experience. Specifically, an SD questionnaire was presented with a randomly selected dental healthscape scenario (i.e., stimulus) using textual illustrations and photos, and respondents were asked to imagine being in the scenario and were then prompted to express their emotional response by rating each Kansei word. Each Kansei word was rated from 1 (the healthscape scenario does not make me such Kansei) to 5 (the healthscape scenario strongly makes me such Kansei). Additionally, respondents were asked to rate their revisit intention provoked by the stimulus from 1 (weak intention) to 5 (strong intention).
This synthesis of property space and semantic space required testing for validity. Exploratory factor analysis was used to validate the effectiveness of the space synthesis, focusing primarily on the adequacy of the Kansei words in the semantic space [66]. A Kansei word with significant load on at least one latent factor meant that the Kansei was indeed caused by the healthscape and should be retained. On the contrary, a Kansei word was removed only if it was with low loads on all latent factors. In such a case, we would return to Step 2 and update the semantic space.
Step 5: Analysis of the relationship between the semantic and property spaces This step used partial least squares (PLS) [71,72] to analyze the questionnaire data and identify the relationships of Kansei with revisit intention and the design elements of dental healthscapes. PLS generalizes and combines features from principal component analysis and multiple regression and is often used to examine interrelationships among multiple independent and dependent variables, especially when the independent variables are numerous and highly collinear. In addition, variables are not required to follow a normal distribution for PLS. Prediction through PLS is achieved by extracting the orthogonal latent factors with the best predictive power from the independent variables [71][72][73].
Two relationship models were constructed: In the first model, the strength of a client's revisit intention is the dependent variable, and the client Kansei ratings are the independent variables. This model highlights the influence of each Kansei on clients' willingness to revisit. In the second model, the rating of each Kansei is the dependent variable, and design elements are the independent variables. Through this model, the effect of each design element on each Kansei can be determined.
Step 6: Development of the design ideas Step 5 determined how the healthscape elements should be concerned and which attributes should be retained or avoided to help clients maintain positive emotions while receiving dental service and to increase their revisit intentions. This knowledge can be used to develop client-centered healthscapes. With consideration given to the three dimensions of design, ambience, and social interaction [65], 17 design elements of the dental healthscape (E1-E17) were selected, each of which had two or three attributes, resulting in a total of 39 attributes (A1-A39), as displayed in the left column of Table 1.

Healthscape Stimuli for the Questionnaire Survey
Through an orthogonal design, 24 dental healthscape stimuli were created, as exhibited in the right column of Table 1. Each stimulus was formed by combining the 17 elements with a selected attribute-1 meant the stimulus included the attribute, whereas 0 meant it did not include the attribute.

Sampling and Data Collection
Individuals over 20 years old having the experience of dental treatment were the target population of this study. Participants were enrolled through convenience sampling and recruited from the Internet and social media. Prior to participating in the survey, the definition of the dental healthscape was explained, and the eligibility of the participants was confirmed. Overall, 600 participants, 25 for each stimulus, were surveyed during the period from July 2017 to May 2018. Each participant was asked to conduct Kansei evaluations on only one stimulus. Finally, 555 valid questionnaire responses (validity rate = 92.5%) were included in the subsequent analysis. The demographic characteristics of the participants are presented in Table 2.  Table 3 shows the factor analysis results using principle component analysis with varimax rotation of factors to analyze the data from the 555 questionnaires. The Kaiser-Meyer-Olkin measure of sampling adequacy was 0.972, and the p-value of Bartlett's test of sphericity was 0.000. Two factors with eigenvalues higher than 1 were extracted, explaining 73.258% of the total variance. The factor loading of each Kansei word to the factor to which it belonged was greater than 0.5, indicating that all 20 Kansei words were valid for the semantic space. Although some words (e.g., hopeful, relieved, obliging, helpful, tender, and friendly) had the problem of cross-loading, this only demonstrated that people's emotions may not be explained by one factor alone and did not affect the appropriateness of using them for expressing client emotions. In addition, the Cronbach's α value and composite reliability of each factor were both higher than 0.9, indicating internal consistency (reliability) in the Kansei evaluations. Factor 1 contained 11 Kansei words, most of which were related to the emotions caused by environment. Factor 2, which contained nine Kansei words, was mostly related to the emotions caused by dental staff.

Relationship between the Semantic Space and Property Space
Using the first relationship model (Y revisit intention = f (client Kanseis) ), the PLS results revealed that all 20 Kanseis had a positive effect on the dental revisit intention of clients (Bootstrap t-value > 2.57, p < 0.01). The five Kanseis most strongly related to revisit intention were thoughtful (K19), hopeful (K20), tender (K4), comfortable (K11), and cozy (K15), as listed in Table 4.
Using the second relationship model (Y Kansei = f (design elements) ), PLS identified 17 attributes that had significant effects on the Kanseis (Bootstrap t-value > 2.57, p < 0.01). Six attributes belonged to the dimension of design: "dentist wears blue surgery gown" (E3A7), "dentist's name is shown" (E4A8), "dentist's name is not shown" (E4A9), "using demo picture or sample for treatment explanation" (E5A10), "without demo pictures or samples" (E5A11), and "dentist wears a mouth mask only" (E6A14). Three attributes belonged to the dimension of ambience: "with music" (E11A24), "without music" (E11A25), and "without disinfection action in front of clients" (E12A28). Eight attributes belonged to the dimension of social interaction: "dentist chats with client" (E13A29), "dentist does not chat with client" (E13A30), "dentist tells client before any operation" (E14A31), "dentist does not tell client before any operation" (E14A32), "client opens mouth less than 20 minutes each time" (E15A33), "client opens mouth more than 20 minutes each time" (E15A34), "assistant is always at chair side" (E16A35), and "no assistant is next to the dental unit" (E16A37). The cross-loadings included in Table 5 quantify the effects of these significant attributes on each of the 20 Kanseis.

Discussion
In this study, all 20 Kanseis had significant effects on the clients' revisit intentions. This highlights the importance of maintaining positive Kansei in dental services. Studies have demonstrated that clients can benefit from regular oral care and immediate treatment more when the positive atmosphere of the dental healthscape reduces their fear and anxiety [27,28,74]. Also, this creates the elements of positive experience and physical, psychological, or emotional safe care for the building of green clinical care. To achieve positive emotions, 10 healthscape elements with 17 attributes had significant effects on the them. On the basis of the results shown in Tables 4 and 5, Figure 4 visualizes the healthscape element-Kansei-revisit intention relationships which are then discussed in this section.

Discussion
In this study, all 20 Kanseis had significant effects on the clients' revisit intentions. This highlights the importance of maintaining positive Kansei in dental services. Studies have demonstrated that clients can benefit from regular oral care and immediate treatment more when the positive atmosphere of the dental healthscape reduces their fear and anxiety [27,28,74]. Also, this creates the elements of positive experience and physical, psychological, or emotional safe care for the building of green clinical care. To achieve positive emotions, 10 healthscape elements with 17 attributes had significant effects on the them. On the basis of the results shown in Table 4 and Table  5, Figure 4 visualizes the healthscape element-Kansei-revisit intention relationships which are then discussed in this section. The five Kanseis had the strongest positive impacts on revisit intentions: thoughtful, hopeful, tender, comfortable, and cozy. Thoughtful was identified as the most noteworthy Kansei for clients involved in the dental healthscape. This emphasizes the importance of enhancing patient-centered care, in which a healthcare provider must understand the biopsychosocial context of patients and provide care in accordance with their cultural values, requirements, and preferences [75][76][77]. A thoughtful treatment plan and a process with clear treatment goals helps patients to feel more hopeful [78]. Hopeful was also a Kansei increasing clients' revisit intention. Hopeful is an exceptional positive emotion that builds resilience and optimism [39]. A hopeful atmosphere motivates a client to participate actively in dental service. A study of orofacial pain suggested that a resilience-based hope intervention was beneficial for reducing pain sensitivity [79]. Previous research has indicated that patient perceptions of the physician's compassion had a positive effect on healthcare [80]. Empathy is a critical dimension for measuring service quality [81]. Tenderness is a basic constituent of empathy The five Kanseis had the strongest positive impacts on revisit intentions: thoughtful, hopeful, tender, comfortable, and cozy. Thoughtful was identified as the most noteworthy Kansei for clients involved in the dental healthscape. This emphasizes the importance of enhancing patient-centered care, in which a healthcare provider must understand the biopsychosocial context of patients and provide care in accordance with their cultural values, requirements, and preferences [75][76][77]. A thoughtful treatment plan and a process with clear treatment goals helps patients to feel more hopeful [78]. Hopeful was also a Kansei increasing clients' revisit intention. Hopeful is an exceptional positive emotion that builds resilience and optimism [39]. A hopeful atmosphere motivates a client to participate actively in dental service. A study of orofacial pain suggested that a resilience-based hope intervention was beneficial for reducing pain sensitivity [79]. Previous research has indicated that patient perceptions of the physician's compassion had a positive effect on healthcare [80]. Empathy is a critical dimension for measuring service quality [81]. Tenderness is a basic constituent of empathy and especially related to caregiving [82]. Linsher et al. [83] suggested that weakness evokes tender feelings even when the context is not immediate in nature. The present study determined that tender was one of the Kanseis most positively related to clients' revisit intention. Comfort is a positive concept that can increase people's health-seeking behavior [84]. Spake et al. [85] provided evidence that comfort has a substantial effect on consumer satisfaction, trust, and commitment with service providers. In this study, the comfortable Kansei increased clients' revisiting intention. A cozy atmosphere, which was identified important in this analysis, helps to reduce stress and induce psychological well-being when people encounter an unfamiliar environment and feel anxious about an upcoming event [86]. To create specific Kansei for clients, Table 5 reveals the effects of healthscape elements in detail; these effects can serve as references for dental healthscape design.
Several results regarding the healthscape elements of the design dimension were noteworthy. Compared with the conventional white physician gown, a blue surgery gown was the most closely related to the clean Kansei; this result is different from results of previous studies [87,88]. In Taiwan, a blue surgery gown is often seen in the special examination room or intensive care unit and gives people an impression of a high degree of medical hygiene. Furthermore, displaying the dentist's name helps clients identify the dentist. Having full access to the dentist's information contributed the most to the clients' steady Kansei. Similarly, medical demonstrations and sample models to patients have been identified as valuable tools in the healthscape [51,89]. This study confirmed these results and furthermore discovered that using demo pictures or samples for treatment explanation contributed highly to the healthful Kansei of clients. This finding may explain why people who were anxious about visiting dentists preferred knowing the causes and procedures of dental treatment by using cartoons or X-ray films rather than using pictures of real teeth [32]. "Dentist wears a mouth mask only" most negatively affected the clean Kansei. Conversely, "dentist wears a large face-mask" signaled good infection control [86].
Ambience is a critical concern of the design of the dental service process [68]. For example, playing music has been demonstrated to reduce the anxiety of people in waiting rooms [86,[88][89][90]. Music also decreases blood plasma cortisol levels and reduces negative emotions [70]. This study confirmed that music in the healthscape creates positive emotions and determined that music mostly affected the cozy and encouraging Kansei. A study found that parents' encouragement stimulated children's engagement in healthy behavior [91]. Similarly, our study indicated that music stimulated a client's dental visit intention. In addition, the attribute of "without disinfection action in front of clients" most negatively affected the healthful Kansei, indicating that deliberately allowing clients to observe disinfection actions is beneficial.
Several results regarding the healthscape elements of the social interaction dimension are discussed as follows. A client sitting in the dental chair rarely knows what will happen in the dental procedure. If the dentist does not provide an explanation, the client feels helpless [31,89,92]. The results of our study indicated that the dentist chatting with the client most affected the friendly Kansei, and telling the client before performing an operation most affected the informed Kansei. Clients tend to feel better if preparatory information is tailored and comprehensive [32,89]. We believe that these dentist-client interactions improve the dentist-client relationship, reduce the client's anxiety about receiving dental services [32,89,92], and create positive social bonds between the client and service provider [81]. In particular, dialog between the dentist and client before the procedure, throughout the process, and even after care is an effective communication method. The attribute of "open mouth less than 20 minutes each time" strongly affected the relieved Kansei, as demonstrated in previous studies [74,88]. Clients were allowed to express their feelings, doubts, and thoughts to the dentist by raising a hand, which possibly alleviated the anxiety. No assistant next to the dental unit had the most negative effect on the obliging Kansei. An assistant helps the dentist control infection, assuage client anxiety, and ensure safety; thus, an assistant facilitates high-quality care [90]. Having an assistant chairside made clients feel warm and obliging, improving client satisfaction.
The design of the dental office and practice relates to the dentist's brand [68]. By understanding the Kansei of clients, client-centered dental healthscape design can be implemented. A dental healthscape can be built that magnifies key positive Kanseis to eliminate anxiety, rejection, and other negative emotions in clients and increase their motivation to seek dental services. Importantly, this contributes to the effective and appropriate use of medical resources, reducing waste and harmful emissions which affect the environment.

Conclusions
Dentistry is highly energy-and resource-intensive with a significant environmental impact. Having the nature of service industries, dental service is a highly interactive experience between care providers and receivers [93]. Communication and participation influence client satisfaction and perceived value [94]. Enhancing client perceived value and motivating clients' positive emotions in the medical process is the best way to promote preventive dental care, early treatment, and effective use of medical resources, which consequently reduces the harm to the environment in the long run, and contributes to green dentistry supply chains.
Treatment is beneficial when clients voluntarily and honestly provide relevant information, including their current health status, expected outcomes, and affordable risks [42,43]. The willingness of clients to visit dentists affects their pursuit of preventive dental and periodontal care, early treatment, and regular oral examinations, affecting their physical health, psychological condition, and quality of life [95]. In Taiwan, the satisfactory health insurance system and high quality of medical care have overcome most barriers in accessing medical care. However, psychological barriers such as fear and anxiety remain.
Several methods for reducing dental anxiety have been proposed, including explanation of the treatment steps, administering drugs, and improving the clinical environment [32,74]. Research indicated that patients with anxiety prefer nonpharmacological intervention because of the low perceived medical risks [96]. Client-centered design of the healthscape is a method for avoiding pharmacological intervention. This is also a green practice that is important for reducing resource use and maintaining environmental sustainability.
On the theoretical basis of the SOR model, this study applied KE to understand the effects of dental healthscape elements on clients' Kansei and the subsequent effects on dental revisit intention. Kansei, inspired by Japanese philosophy and culture, illustrates the emotions and experiences of people in specific environments [59]. This study examined the design of client-centered dental healthscapes through KE to devise a space in which clients generate and maintain positive emotions when they visit. Positive emotions present new possibilities and provide clients with a wide range of thoughts and actions [39]. In addition, this study investigated the physical environment and client-dentist interactions of the dental healthscape. Consistent with the Gestalt framework [19,53], the findings of this study indicate that clients holistically evaluate dental visit experiences. Design factors (e.g., the dentist's name is shown), ambience factors (e.g., music), and social interaction factors (e.g., the dentist chats with clients and tells them before performing any operation) were linked to the client Kansei and dental revisit intentions. These results provide references for healthscape design to help clients maintain positive emotional states during care and increase dental revisit intention, benefiting the promotion of preventive dental care, early treatment, and regular use of dental services.
This study makes several theoretical contributions. First, KE is an ergonomic methodology of affectional design for products and services. This study demonstrates its effectiveness in empirical studies of the SOR model. Second, little comprehensive research on the emotions of clients in the dental healthscape exists. However, understanding the effects of dental healthscape elements on clients' Kansei and the subsequent effects on dental revisit intention is critical for promoting dental health. This study fills that particular research gap. Third, the clients' Kansei and evaluations of visit experiences are stimulated by the healthscape holistically. Studying the effects of a single element without considering its interactions with others is insufficient. Clients' experience is holistic, encompassing every contact with the healthscape [57]. This study examined the combination of all design elements of the healthscape, including the physical environment, service delivery process, and social interaction factors. This is the major advantage of using a KE-based method. Finally, this study provides a method for health service providers to build a client-centered care practice, which improves both health and quality of life. Compared with the sedative anesthesia method of using drugs, this study proposes the reduction of the clients' anxiety state and the boosting of positive emotions by improving the environmental atmosphere of the dental healthscape, which is green.
Some limitations of this study indicate future research directions. First, in addition to healthscape, there are other internal and external factors of the dentistry supply chain that affect client value and green practices; however, they were not considered in this study. Second, textual illustrations and photos were used to present stimuli in the questionnaire. The use of these materials may have provided insufficient stimulation and weakened the formation of Kansei. Third, the clinical techniques of the dentists were not considered in this study; these potentially influence Kansei and thus should not be ignored. Finally, this study did not consider demographics; different groups of people have dissimilar needs.