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Dear Colleagues,

In recent years, oral rehabilitation has witnessed significant advancements in material, technical and technological aspects. These remarkable achievements have led to numerous benefits, such as enhanced diagnostic accuracy, precise treatment planning, an improved predictability and longevity of rehabilitation treatments, increased safety and efficiency of procedures, and the overall enhancement of the patient experience and acceptance. Given the rapid pace of these advancements, it is important to publish a Special Issue that aims to keep researchers informed about the latest breakthroughs in the field of dentistry. The topics covered in this Special Issue include, but are not limited to, new developments in endodontic and restorative materials, such as bioactive systems, CAD-CAM technology, artificial intelligence in dentistry and its clinical applications. We strongly encourage the submission of translational research in the dentistry area. Original studies describing novel therapeutic approaches or materials and reviews on the above topics are welcome.

Dr. Jaime Portugal
Dr. Cristina Bettencourt Neves
Guest Editors

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18 pages, 14835 KiB

Open AccessArticle

Influence of Food Pigments and Thermal Aging on the Color Stability of Denture Base Resins

by Beatriz Costa, Cristina Bettencourt Neves, João Carlos Roque, Vitor Anes and Virgínia Santos

Appl. Sci. 2025, 15(3), 1503; https://doi.org/10.3390/app15031503 - 1 Feb 2025

Viewed by 955

Abstract

Color stability of acrylic resins is essential for preserving the aesthetic appearance of denture bases over time. This study explores how food pigments and thermal changes affect the color stability of commonly used denture base resins. Four acrylic resins were tested: three heat-cured acrylic resins with different characteristics (Zhermack^® Villacryl H Plus V2, H Plus V4, and H Rapid FN V4) and one self-cured acrylic resin (Zhermack^® Villacryl S V4). To simulate the oral environment, the resins underwent 1000 thermal cycles between 5 °C and 55 °C, followed by a 7-day immersion period in beverages such as coffee, red wine, a caramel-colored soft drink (cola), and distilled water (control), forming sixteen group of specimens (n = 5). Color changes (∆E) were measured using the VITA Easyshade V^® spectrophotometer, following the CIEDE2000 standard. The findings revealed that thermal aging caused noticeable color changes in all resins (p < 0.001). Red wine led to the most intense discoloration, followed by coffee. The caramel-colored soft drink caused moderate staining, while distilled water had a negligible effect. The type of polymerization did not affect the degree of discoloration, as no significant differences were found between the resins after exposure to beverages (p > 0.05). Overall, this study highlights how both internal and external factors impact the appearance of acrylic resins. Thermal aging can accelerate polymer degradation, while pigments in beverages cause visible staining. Among the tested beverages, red wine proved to be the most aggressive due to its high pigment concentration and low pH. These findings emphasize the need for improved material formulations to enhance the longevity and aesthetic performance of dentures. Full article

(This article belongs to the Special Issue Advances in Oral Rehabilitation: Materials, Techniques and Clinical Applications: 2nd Edition)

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11 pages, 2322 KiB

Open AccessArticle

Comparative Analysis of Mechanized Versus Conventional Polishing Protocols for Denture Base Acrylic Resins

by Margarida Martins Quezada, Carlos Fernandes, Javier Montero, André Correia and Patrícia Fonseca

Appl. Sci. 2025, 15(2), 605; https://doi.org/10.3390/app15020605 - 9 Jan 2025

Viewed by 648

Abstract

Surface roughness is primarily determined by the inherent characteristics of a material, the specific polishing protocol and the manual operator’s dexterity. This research intends to conduct a comparative analysis between a conventional and mechanized polishing protocol concerning surface roughness and its impact on surface topography. Thirty samples were included in this in vitro study: six samples for each type of acrylic resin. All specimens underwent a polishing protocol by a conventional method and a mechanized approach with a controlled polishing tool (CPT). Profilometric measures were extracted: arithmetic mean height (Pa), skewness (Psk) and kurtosis (Pku). The Pa values acquired through both the mechanized and conventional polishing techniques are significantly lower compared to the control group. The mechanized polishing notably yielded higher roughness compared to the control group. Relatively consistent skewness and lower-to-moderate values of kurtosis were found across resin types. Differences in the dispersion and pattern for Pa were not detected between the polishing protocols. The CPT protocol reliably maintains consistent skewness and kurtosis values. The conventional protocol remains significant due to the variations observed in the Pa values obtained. Full article

(This article belongs to the Special Issue Advances in Oral Rehabilitation: Materials, Techniques and Clinical Applications: 2nd Edition)

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