Prosthesis, Volume 7, Issue 2 (April 2025) – 21 articles

Purpose: This study aimed to evaluate the load-bearing capacity of three different millable lithium silicate derivatives compared with lithium disilicate ceramic when used as ultra-thin occlusal veneers on eroded molars. The null hypothesis stated that there would be no significant differences in load-bearing capacity (F_max). Material and Methods: Four groups were tested: three groups with lithium silicate derivatives—“Celt” (Celtra, Dentsply Sirona, Bensheim, Germany), “Vita” (Vita Suprinity PC, Vita Zahnfabrik, Bad Säckingen, Germany), and “Nice” (n!ce, Straumann, Basel, Switzerland)—and a control group with lithium disilicate ceramic, “Emax” (IPS e.max CAD, Ivoclar Vivadent) (n = 20 per group). Extracted molars (n = 80) were prepared to simulate erosion and restored with occlusal veneers designed and milled by using CAD/CAM technology. After thermo-mechanical aging, the specimens were subjected to static load testing until fracture. Failure types were recorded and analyzed. Statistical evaluation included the Wilcoxon rank-sum test for group comparisons and Weibull distribution modeling to assess fracture probabilities. Results: Thermo-mechanical aging caused restoration debonding in three specimens from the “Nice” and “Celt” groups, resulting in fatigue resistance of 100% for “Emax” and “Vita”, 90% for “Celt”, and 95% for “Nice”. The mean F_max values ranged from 892 N to 2087 N, with the “Vita” group demonstrating the highest values. Significant differences in stress values were observed among groups (p < 0.05). Cohesive failure was the most frequent failure mode. Conclusions: All tested lithium silicate derivatives demonstrated high load-bearing capacity and are suitable for ultra-thin occlusal veneers on eroded molars. Cohesive failures dominated, indicating reliable material performance and stable bonding under load. Full article

Background: Technological progress in the field of prosthetic dentistry has changed the workflow, optimizing times and increasing the possible choices of prosthetic rehabilitation. Methods: The adaptability of three resin plates to the plaster model was evaluated by visual evaluation and by filling out a questionnaire in which two areas present in three silicone impressions obtained with three different construction methods were selected, including the traditional method, CAD/CAM method for milling, and CAD/CAM method for addition. Results: The results showed that although silicone 3 obtained with the additive method had better performances in the selected areas, the p-value of 0.735 was >0.05, and therefore there are no statistically significant differences between the different silicone impressions. Furthermore, a poor agreement between the evaluators was found (k 0.184). Conclusions: This work conducted in vitro highlights an important aspect of the choice of material used for impressions in cases of prosthetic relining. More in-depth studies with larger samples and objective measurement methods will be needed to compare fit data across different prosthetic construction modalities. Full article

Background: Resin-bonded fixed dental prostheses (RBFDPs) have become an increasingly popular minimally invasive solution for replacing missing anterior teeth. However, their long-term success is influenced by factors such as bridge design and material selection. Methods: This systematic review and meta-analysis aimed to assess the impact of different bridge designs on the clinical performance and failure risks of anterior ceramic RBFDPs. A comprehensive search of electronic databases was conducted to identify clinical studies published in English up to January 2025. Nine studies, including randomized controlled trials, cohort studies, and clinical trials, met the inclusion criteria. Results: The analysis revealed that single-retainer RBFDPs demonstrated lower failure rates than two-retainer models (RR: 0.36, 95% CI: 0.17–0.75). Among failure types, fractures were significantly less common in cantilever designs compared to two-retainer designs (RR: 0.25, 95% CI: 0.09–0.73), while no significant differences were observed in debonding rates (OR: 0.40, 95% CI: 0.015–1.10). Conclusions: In terms of material selection, all-ceramic RBFDPs in cantilever designs exhibited significantly lower failure rates (RR: 0.12, 95% CI: 0.03–0.43), whereas metal-ceramic RBFDPs showed no significant difference in failure rates based on bridge design (RR: 0.56, 95% CI: 0.21–1.53). These findings suggest that all-ceramic cantilever RBFDPs may offer superior long-term outcomes, highlighting the importance of precise preparation and cementation protocols for clinical success. Full article

Background: Assessment of functional occlusion is crucial in orthodontics and prosthodontics. With scientific advancements, optical jaw tracking systems are increasingly used to evaluate mandibular kinematics. Objectives: To compare the performance of an optical jaw tracking system (Modjaw^®) and a traditional condylar position indicator (CPI) in identifying condylar position discrepancies within an orthodontic population. A secondary objective was to explore the association between condylar discrepancies and temporomandibular disorders (TMD). Methods: Measurements were collected from 132 patients consecutively recruited from the private practice of a coauthor, using Modjaw and CPI, analyzing discrepancies in the sagittal, vertical, and transverse planes. TMD presence was determined clinically and using the DC-TMD questionnaire. Receiver operating characteristic (ROC) curves and diagnostic metrics were used to evaluate the tools’ performance. Results: No correlation was found between CPI and Modjaw measurements. CPI did not effectively discriminate between patients with and without TMD, with areas under the curve (AUC) not statistically significant. In contrast, the AUCs for Modjaw were 0.683 for the vertical plane (p = 0.001), 0.654 for the sagittal plane (p = 0.004), and 0.777 for the transverse plane (p < 0.001). The cut-off values for TMD screening using Modjaw were established at 2 mm (vertical), 1 mm (sagittal), and 0.5 mm (transverse), exhibiting some specificity, especially in the transverse dimension, but very low sensitivity. Conclusions: No correlation was found between Modjaw and CPI for assessing condylar position discrepancies. While these discrepancies may aid orthodontic treatment planning, they lack sufficient sensitivity for reliable TMD diagnosis. Modjaw’s cut-off points may help exclude TMD risk in orthodontic patients. Full article

Introduction: Additive manufacturing has emerged as a promising solution for improving the accessibility and affordability of upper limb prostheses. Despite the growing need, traditional prosthetic devices remain costly and often inaccessible, particularly in underserved regions. This review examines the current landscape of 3D-printed upper limb prostheses, focusing on their design, functionality, and cost-effectiveness. It aims to assess the potential of 3D-printing upper limb prostheses in addressing current accessibility barriers. Methods: A two-phase approach was used to analyze the literature on 3D-printed upper limb prostheses. The first phase involved a literature search using keywords related to 3D printing and upper limbs prostheses. The second phase included data collection from online platforms such as Enabling the Future, Thingiverse, and NIH 3D Print Exchange. Studies focusing on the design, fabrication, and clinical application of 3D-printed prostheses were included. The results were organized into categories based on design characteristics, kinematic features, and manufacturing specifications. Results: A total of 35 3D-printed upper limb prostheses were reviewed, with the majority being hand prostheses. Devices were categorized based on their range of motion, actuation mechanism, materials, cost, and assembly complexity. The e-NABLE open-source platform has played a significant role in the development and dissemination of these devices. Prostheses were classified into cost categories (low, moderate, and high), with 64% of models costing under USD 50. Most designs were rated as easy to moderate in terms of assembly, making them accessible for non-specialist users. Conclusions: Three-dimensional printing offers an effective, low-cost alternative to traditional prosthetic manufacturing. However, variability in design, a lack of standardized manufacturing protocols, and limited clinical validation remain challenges. Future efforts should focus on establishing standardized guidelines, improving design consistency, and validating the clinical effectiveness of 3D-printed prostheses to ensure their long-term viability as functional alternatives to traditional devices. Full article

Objectives: The term ‘prosthesis’ in reference to breast implants is used to clarify its distinction from the general term ‘breast implant’, which is widely adopted by plastic surgeons. This terminology highlights the role of the implant as a functional tissue substitute, particularly in post-mastectomy reconstruction, rather than solely as a cosmetic enhancement. This distinction is relevant for understanding the long-term implications of implant-based reconstruction and the associated complications. The aim of this systematic review was to compile and analyze the current evidence on the long-term complications associated with breast implants. We explored how these complications vary depending on implant type, surgical techniques, patient-specific factors, and the indication for implantation (cosmetic vs. reconstructive). These indications were analyzed separately to avoid assumptions regarding their correlation with surgical techniques. Methods: A systematic search was conducted across PubMed, Web of Science, and Scopus for studies published up to December 2024, following PRISMA 2020 guidelines and the Cochrane Handbook for Systematic Reviews of Interventions. An initial search identified 1480 studies. After screening and applying inclusion criteria, 11 studies were selected for the final analysis. Studies included in this review reported long-term complications in human subjects, were published in English, and evaluated breast implants. The quality of the included studies was assessed using the ROBINS-E tool. Additionally, subgroup analyses examined differences based on implant type (silicone vs. saline), surgical techniques, and patient characteristics, such as age, comorbidities, and the duration of follow-up. Results: This review study was performed between September 2024 and December 2024. A total of 11 studies were included in the review. The included studies were published between 1997 and 2021, providing a long-term perspective on breast implant complications. The most frequently reported complications were capsular contracture, implant rupture, seroma, and infection, with capsular contracture being the most prevalent. Silicone implants were associated with a higher risk of rupture compared to saline implants. Techniques using textured implants and dual-plane placements were found to reduce the incidence of capsular contracture. Patient-related factors, such as age and smoking status, were identified as significant risk factors for complications, while longer follow-up periods revealed more late-onset complications. Conclusions: This review underscores the importance of understanding the long-term risks of breast implants and highlights the need for personalized surgical planning and thorough follow-up care. Future studies should focus on standardizing outcomes reporting and further evaluating the safety and effectiveness of new implant materials and surgical approaches. Full article

Background: Digital impression techniques for edentulous patients present unique challenges due to the absence of stable anatomical landmarks and variable soft tissue morphology. While intraoral scanners have shown promising results in dentate patients, their application in edentulous cases remains problematic, with reported accuracy deviations ranging from 60.6 ± 11.9 μm to 67.2 ± 6.9 μm compared to conventional methods. Material and Methods: This pilot study employed a within-subject, repeated-measures design comparing four scanning protocols in a fully edentulous patient (age: 42, BMI: 24.3 kg/m², Cawood and Howell Class III). Digital scans were performed using iTero Element 5D and Trios 5 scanners (n = 10 scans per group), with and without a modified technique incorporating standardized reference points (1 mm diameter, 5 mm intervals) and systematic soft tissue management. A conventional impression-derived digital model served as the reference standard. Accuracy assessment utilized best-fit alignment and root mean square (RMS) calculations through Geomagic Control X software (version 2020.1.1). Results: The modified technique demonstrated significantly improved accuracy (Groups C/D: 57.8–59.7 μm) compared to standard protocols (Groups A/B: 66.9–68.2 μm) (p < 0.001). Mean scanning times were reduced by 37% with the modified technique (2:10 ± 0:09 min vs. 3:24 ± 0:15 min). Inter-operator reliability showed excellent agreement (ICC = 0.92, 95% CI: 0.88–0.95). Soft tissue management significantly improved vestibular area accuracy (48.7 ± 6.3 μm vs. 72.4 ± 8.9 μm, p < 0.001). Conclusions: The proposed scanning strategy incorporating reference points and systematic soft tissue management significantly improved both accuracy and efficiency in digital impressions of edentulous arches. The technique showed excellent reproducibility and potential clinical applicability across different scanner systems. These findings warrant validation through larger-scale clinical trials to establish definitive protocols for digital impression-taking in edentulous patients. Full article

Background/Objectives: Digital workflows for implant-supported full-arch restorations remain challenging. This study evaluated the accuracy and precision of digital impressions using reverse scan body (RSB) prototypes and intraoral scanners (IOSs) for rehabilitating fully edentulous patients following the All-on-4 protocol. Secondary objectives included comparing accuracy between expert clinicians and beginners, as well as desktop scanners and various RSB designs. Methods: An in vitro study was conducted using a fully edentulous mandible model with four Osstem TSIII implants. A final-year dental student and an expert clinician captured digital impressions using IOSs and desktop scanners. Four groups were analyzed: (A) original scan bodies with the IOS, (B) short RSBs with the IOS, (C) RSBs with desktop scanners (short sandblasted, long sandblasted, long coated), and (D) a control group using original scan bodies with a desktop scanner. Root mean square (RMS) values measured dimensional differences, with statistical analysis performed using the Wilcoxon signed-rank test and one-way ANOVA (α = 0.05). Results: A total of 42 scans were analyzed. No significant difference was found between expert and student for original scan bodies using the IOS (p = 0.220), while RSB prototypes showed significant differences (p = 0.008). No significant accuracy differences were noted between original scan bodies and RSBs with the IOS, but IOSs outperformed desktop scanners. Among RSBs scanned with desktop scanners, no significant differences were observed between designs. Conclusions: RSB prototypes are a viable alternative to original scan bodies for fully digital workflows in All-on-4 rehabilitations, with IOSs offering superior accuracy. However, proper training is crucial for optimizing RSB accuracy. Variations in height and coating did not impact overall accuracy. Full article

Background/Objectives: With advancements in technology, three-dimensional (3D) printing has become widely used, offering many advantages. Recently, 3D printing has been utilized for the fabrication of permanent crowns. However, there is still a need for more information regarding the technology, materials, and factors that may affect the properties of 3D-printed permanent crowns. Methods: This review was conducted to collect and assess information regarding the performance of 3D printing technology for permanent crown fabrication. An electronic search was performed using various search engines (Scopus, PubMed, Google Scholar) up to December 2024, yielding 123 articles. After screening, 24 articles that specifically investigated 3D-printed crowns were included. Results: Based on the findings, two categories of materials for 3D-printed permanent crowns were identified: ceramic-based and resin-based. Among the technologies used, digital light processing (DLP) was the most common, reported in 11 studies, followed by stereolithography (SLA) in 7 studies, and lithography-based ceramic manufacturing (LCM) in 4 studies. Conclusions: Ceramic-based crowns demonstrated higher performance compared to resin-based crowns. However, resin-based crowns were found to be clinically acceptable. Ceramic-based crowns are recommended for permanent crown fabrication, while resin-based crowns require further investigation to address the limitations of the materials and technologies used. Full article

Objective: The aim of this meta-analysis was to investigate whether home-based physical therapy (HPT) is as safe and effective as the conventional inpatient/outpatient physical therapy (CPT) after total knee arthroplasty (TKA). Methods: Three databases (PubMed, Web of Science, and Cochrane) were systematically searched on 8 January 2024. Randomized controlled trials (RCTs) comparing HPT with CPT following TKA were included. The outcomes included Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), Knee Injury and Osteoarthritis Outcome Score (KOOS), Oxford Knee Score (OKS), 6 min walking test, range of motion (ROM), 36-Item Short Form Survey (SF-36), and visual analogue scale (VAS) for pain, and were analyzed at short-term (≤12 weeks) and mid/long-term follow-ups (>12 weeks). Results: Twenty RCTs (3706 patients) were included. Both groups experienced significant improvements, but no differences emerged when comparing all analyzed outcomes. WOMAC improvement was 36.2 points with HPT (p < 0.0001) vs. 39.2 with CPT (p < 0.0001); KOOS increased by 24.8 points with HPT (p < 0.0001) vs. 25.2 points with CPT (p < 0.0001); OKS improved by 16.1 points with HPT (p < 0.0001) vs. 16.3 points with CPT (p < 0.0001); ROM improved by 6.3° with HPT (p = n.s.) vs. 7.7° with CPT (p = 0.029); SF-36 improved by 3.3 points with HPT (p = n.s) vs. 7.4 points with CPT (p = n.s.); and VAS pain decreased by 2.5 points with HPT (p < 0.0001) vs. 3.0 points with CPT (p < 0.0001). Conclusions: HPT is a valid option for the post-operative rehabilitation of patients undergoing TKA, leading to results similar to CPT. This questions the need for a more complex and expensive management of these patients, considering the additional HPT benefits of healthcare cost reductions, early patient discharge, and less in-person physical therapy sessions, with equal patient final satisfaction. While this review offers a comprehensive representation of numerous studies, the research underlines significant heterogeneity in the reported data, thereby diminishing the overall robustness of the analysis, and future studies are needed to confirm the study results. Full article

Background/Objectives: Individuals with transradial limb loss or absence often retain the ability to pro-supinate their forearm, but the traditional design of the prosthesis precludes this motion from being used for direct prosthesis control. Methods: A prosthetic arm was created for a single user that employed a novel split inner socket to allow pro-supination of the residuum to control a powered prosthetic wrist rotator. A total of 14 subjects (13 able-bodied subjects and one prosthesis user) performed the Refined Clothespin Relocation Test. The user performed the test with their own and a novel research prosthesis, which allowed independent hand and wrist function. Movements of limb segments were recorded using a motion capture system and an analysis of limb segment angles and compensatory motion was made. Results: The research prosthesis reduced compensation in the trunk and head and reduced pain in some joints, while the time to complete the test increased. Conclusions: This method has the potential to create additional intuitive control channels for transradial prostheses. Full article

Standardizing socket design and maintaining a default socket alignment in transtibial prostheses are innovations that aim to simplify fitting procedures and reduce prosthetic service costs, particularly in low-income countries. Objectives: This study evaluated the Mercer Universal Prosthesis (MUP) with a standardized “neutral alignment” against custom-made conventional prostheses (CVPs). Methods: Twenty transtibial amputees (n = 20) completed gait assessments using their CVP and immediately after fitting with an MUP. Temporal–spatial and sagittal plane kinematics (hip, knee, and ankle angles) were analyzed, along with a gait symmetry index. Results: the MUP group reported a significant difference between the prosthetic and the intact limb for both hip and knee kinematics (p < 0.05), but there was no change in the CVP group. When compared with the sound limb in the MUP group, post hoc analysis showed that both hip flexion and the hip range of motion (ROM) in the MUP limb significantly increased by 5.7° and 7.3° (p = 0.002 and p < 0.001, respectively). Spatial and temporal gait parameters were comparable between the MUP and CVP groups, and gait symmetry showed no significant differences. The CVP showed greater symmetry in terms of hip (19%, p = 0.012) and knee flexion (8%, p = 0.026) compared to the MUP, while the MUP had higher plantarflexion symmetry (24.4%, p = 0.013). Conclusions: Immediately post fitting, MUP improved joint mobility in the prosthetic limb, potentially enhancing kinematics. While short-term benefits are evident, further research is needed to assess long-term gait adaptation and quality of life impacts. Full article

Background: Transtibial prosthetic sockets are critical components in the complete assembly of a prosthetic, as they form the major load-bearing parts by housing the residual limb of a prosthesis user. Conventional procedures for manufacturing these sockets require repeated iterations and manual casting, baking, and drying, which often lead to longer processing and waiting times. Additive Manufacturing (AM) enables the creation of bespoke designs with meticulous control over the socket’s shape, thickness, and material composition. Method: To design and propose an optimal socket design to a lower-limb prosthetic user based on their preference of activity such as walking, running, and jumping, we investigated seven materials—Polypropylene (PP) standard material for conventional socket fabrication, Polylactic-acid-plus (PLA+), Polyamide (PA) Natural, Polyamide-6-Glass-Fiber (PA6-GF), Polyamide-copolymer (CoPA), Polyamide-6-Carbon-Fiber (PA6-CF), and Polyamide-12-Carbon-Fiber (PA12-CF)—that have AM compatibility by subjecting them to heavy external loading and evaluating their von Mises stress–strain behavior. Result: Using Finite Element Analysis (FEA), we evaluated a single-material design and a combination design with two materials—one major (low cost) and one minor (higher cost)—to optimize a composition that would bear heavy external loads without yielding. A maximum load-bearing capacity of 3650 N was achieved with the combination of PLA+ and 31.54 vol% PA6-CF (30.23 weight%, 99.13 g), costing about USD 14 for the total socket material. Similarly, a combination of PLA+ with 31.54 vol% PA6-GF (30.76 weight%, 101.67 g) exhibited a maximum load-bearing capacity of 2528.91 N. Conclusions: The presence of high-strength CF and GF in minor compositions and at critical locations within the transtibial socket are the suggested reasons for these enhanced load-bearing capacities, due to which these sockets could be used for undertaking a wider range of activities by the prosthesis users. Full article

Introduction: Mandibular complete dentures often pose challenges due to anatomical and functional limitations. Impression techniques, including functional, mucostatic, compressive, selective pressure, and neutral zone methods, play a crucial role in achieving stability and retention. In 1999, Abe introduced the Suction Effective Mandibular Complete Denture (SEMCD) technique, revolutionizing mandibular denture retention by incorporating functional extensions and achieving a peripheral seal even in the presence of mobile soft tissues. Case report: An 87-year-old male presented to a private dental clinic with the chief complaint that his current lower complete denture lacked retention and stability. Intraoral examination revealed a severely resorbed mandibular edentulous ridge with movable retromolar pads and a prominent spongy lingual area. This case report describes the integration of Abe’s concepts into a digital workflow, using a single-step intraoral scanning technique and digital design software to fabricate a mandibular denture with enhanced retention and stability. Conclusions: This approach minimizes the number of clinical steps involved, improves patient comfort, and achieves predictable outcomes, highlighting the utility of digital technologies in modern prosthodontics. Full article

Background/Objectives: The subject of this work is the reconstruction of the inner mechanics of Götz von Berlichingen’s second iron hand. The complex inner mechanics were unknown until Christian von Mechel published a detailed description in 1815. In this artificial hand, each finger can be engaged individually in its three joints and the thumb in one joint. Methods: Based on this description, the individual components were reconstructed at an enlarged scale of 2:1 using computer-aided design (CAD) software and a three-dimensional (3D) printer for the mechanisms. In addition, a finite element method (FEM) analysis was carried out for the components exposed to the greatest stress in order to identify critical areas. Results: By making some adjustments to the mechanics, it was possible to reproduce the mechanisms on a scale of 2:1 on the basis of the index finger. However, when the model was rescaled to 1:1, the internal plastic components were too fragile. This problem was caused by the properties of the 3D printing materials and could be solved by manufacturing the springs from steel. Conclusions: This work aims to make a valuable contribution to the preservation and understanding of the historical artificial second iron hand of Götz von Berlichingen. It once again demonstrates the very precise and detailed craftsmanship of goldsmiths of that time. Full article

Background/Objectives: Corrosion resistance of dental alloys, indicated by metal ion release, is a significant concern. The aim of this study was to investigate the impact of various sandblasting methods on the corrosion resistance of Co-Cr-W alloy samples in an artificial saliva solution. Materials and Methods: Co-Cr-W samples, obtained by additive manufacturing (selective laser melting) and subjected to different processes, were evaluated using electrochemical corrosion tests on potentiostat equipment in Carter–Brugirard artificial saliva. All measurements were conducted at a temperature of 37 °C. The morphology of the samples was analyzed using scanning electron microscopy to highlight changes in roughness and the effects of the electrolyte solution on the surface of the samples. Results: The corrosion current density values decreased as surface processing increased, dropping from an average of 38.5 μA/cm² in non-sandblasted samples (group A) to 0.74 μA/cm² in samples sandblasted with both Al₂O₃ and glass particles (group C), while the corrosion rate of group A (434.8 mm/year) was significantly higher than that of group C (8.08 mm/year). Conclusions: The results demonstrated different behaviors between sandblasted and non-sandblasted samples, which could be attributed to surface morphology differences influencing the corrosion process. Full article

Background/Objectives: Three-dimensional scanning and printing techniques have gained prominence in the fabrication of upper limb prostheses. This paper provides an overview of various studies on the current utilization of 3D scanning and 3D printing techniques in upper limb prostheses. Methods: A scoping review of the literature was performed following the PRISMA-ScR guidelines in Scopus, PubMed, Google Scholar, and Web of Science, with a total of 274 papers included. A bibliometric analysis was conducted, analyzing the field via keyword co-occurrence visualized using VOSviewer software. Results: Keyword co-occurrence analysis identified four key areas, “prosthesis design and evaluation for people”, “prosthesis control and sensing technologies”, “robotics and mechanical prostheses design”, and “accessibility for prosthesis”. Temporal analysis identified three trends: a focus on fingers, advancement of control systems, and the rise of 3D scanning. In addition, qualitative analysis was conducted to discuss the areas and trends that were shown from the bibliometric analysis, highlighting several studies. Conclusions: This review shows the utilization and notable success of 3D printing and scanning techniques when making upper limb prostheses, with the contents of this article informing healthcare professionals and the general public about the field. Full article

Objectives: CAD-CAM technology has enabled clinicians to provide accurate and predictable restorations. Chairside time has been reduced and patient’s comfort has been improved. A fully digital workflow can be now predictably adopted in implant surgery and implant restorations. Methods: A male patient, 55 years old, was referred for the restoration of his edentulous mandible. Radiographs and clinical evaluation were assembled to plan implant placement. The flapless approach is preferred to provide for a mucosa-supported surgical guide and lessen the patient’s post-operative complications. In flapless cases, the operator does not have any direct overview of the surrounding soft tissues and underlying bone. In this case, a new, minimally invasive H-shaped incision technique was performed. A fully digital protocol is presented with a two-piece stackable surgical guide to confirm accurate implant placement. Results: A high-performance polymer framework (PEEK) combined with zirconia crowns completes the digitally designed edentulous restoration. Conclusions: Adopting this technique offers the clinician benefits in both the surgical and the restorative part. Full article

Objectives: The disinfection of fabricated prostheses is crucial to prevent cross-infection between dental laboratories and clinics. However, there is a lack of information about the effects of chemical disinfection on 3D-printed denture base resins. This study aimed to evaluate the impact of different disinfectants on the flexural strength, elastic modulus, micro-hardness, surface roughness (Ra), and change in color of 3D-printed and conventional heat-polymerized (HP) denture base resins (DBRs). Methods: A total of 240 specimens (80 bar-shaped (64 × 10 × 3.3 mm) and 160 disk-shaped (10 × 2 mm)) were made from HP and 3D-printed DBRs. For each resin, the specimens were divided into four groups (n = 10) according to the disinfectant solution. One remained in water without disinfection as a control group, while the other three groups were disinfected using 1% sodium hypochlorite, 2% glutaraldehyde, or 10% Micro 10+ for 30 min. The flexural strength, elastic modulus, micro-hardness, Ra, and color change were measured. The collected data were statistically analyzed using a two-way ANOVA and Tukey’s post hoc test (α = 0.05). Results: A significant decrease in flexural strength, elastic modulus, and hardness was found with sodium hypochlorite (p < 0.05). When comparing the resins per solution, the 3D-printed resin showed a significant decrease in flexural strength, elastic modulus, and hardness compared with PMMA (p < 0.001), while no change was found in the Ra of both resins with all disinfectants (p > 0.05). Disinfecting with sodium hypochlorite resulted in a significant increase in color change for both resins (p < 0.05); however, all the changes were within clinically acceptable limits. Sodium hypochlorite showed the highest color change, while 2% glutaraldehyde and 10% Micro 10+ showed no significant changes in the tested properties (p > 0.05). Conclusions: Neither resin showed a change in surface roughness with immersion in disinfectants. Sodium hypochlorite had an adverse effect on the flexural properties, hardness, and change in color of the PMMA and 3D-printed DBRs, while the other disinfectants had no effect on the tested properties. Full article

Background: This case report addresses the challenges of integrating orthodontic and prosthodontic treatment, particularly in clear aligner cases. The study introduces a novel milled-provisional crown with attachment (M-PCA) technique designed to enhance treatment efficacy and reduce orthodontic attachment debonding, a common issue in clear aligner therapy. Case Report: This is a case report that presents a 49-year-old female patient seeking orthodontic treatment for Class III malocclusion along with periodontal and prosthodontic challenges. The treatment plan involved a multidisciplinary approach, including using M-PCA for temporization during clear aligner therapy. Conclusions: The M-PCA approach demonstrated promising results, with no reported complications such as orthodontic attachment debonding throughout the treatment period. This innovation offers a significant advantage in managing orthodontic cases requiring provisional crowns, ensuring retention, and facilitating orthodontic treatment. Full article