Journal of Prosthetic Dentistry最新文献

Statement of problem: The staining and discoloration of computer-aided design and computer-aided manufacture (CAD-CAM) and heat-polymerized denture base resins caused by cleaners and liquids influence material selection and patient instructions; systematic reviews, however, are lacking.

Purpose: The purpose of this systematic review was to evaluate whether CAD-CAM denture base resins exhibit more staining and discoloration compared with heat-polymerized resins after immersion in liquids and cleaners.

Material and methods: This review followed the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. Searches were conducted in the PubMed, Scopus, Web of Science, Embase, Google Scholar databases, and from the reference lists of articles found. The articles were screened by title and abstract, followed by full-text evaluation. Studies assessing the color change of milled or printed resins compared with heat-polymerized resins after immersion in liquids or cleaners were included. The risk of bias was evaluated using the Joanna Briggs Institute tool for quasi-experimental studies.

Results: Of the 1183 articles identified, 15 were included in this review. Printed resins showed higher staining and discoloration after immersion in cleaners and liquids, followed by heat-polymerized and milled resins.

Conclusions: Printed CAD-CAM resins showed more staining and discoloration, and milled resins showed lower stainability after immersion in liquids and cleaners when compared with heat-polymerized resins.

Complete arch implant-supported restorations require the accurate digital acquisition of implant position, soft tissue anatomy, and interarch relationships. Traditional photogrammetry systems, while accurate, are often limited by cost, equipment complexity, and lack of portability. This manuscript describes a novel scanning workflow for fabricating implant-supported prostheses in which a smartphone-based photogrammetry system (PGAPP) was used to record implant positions. The photogrammetry file was aligned automatically with the intraoral soft tissue scan through the shared geometry of the scan bodies. The technique simplified data acquisition, increased clinical accessibility, and provided a cost-effective digital alternative for fabricating complete arch implant-supported prostheses in clinical practice.

Statement of problem: Metrics-based reviews that analyze all publications on bulk-fill composite resins to identify publication characteristics and trends are lacking.

Purpose: The purpose of this study was to analyze the trends and main characteristics of articles related to bulk-fill techniques and composite resins in dentistry.

Material and methods: The search was conducted in November 2024 on the Web of Science. Three researchers selected the articles and excluded conference papers. The following data were extracted from the included articles: citations; publication year and journal; study design and topic; authorship and institutions, country, continent, and keywords. Collaboration networks were generated using the VOSviewer software program. The altmetric data were measured by consulting the Dimensions database. The correlation between the data was determined by the Spearman test.

Results: A total of 801 articles were included. The number of citations ranged from 0 to 270 and the articles had been published between 1988 and 2024. Most studies were laboratory-based (n=692) and evaluated restoration quality and polymerization stress (n=268), primarily high-viscosity composite resins (n=463) in adult patients (n=774). The country with the highest number of articles was Brazil (n=172), while the continent with the most publications was Asia (n=268). The most prominent author was Giannini (n=31) and co-authorship maps showed collaborations between groups of authors. According to Dimensions, significant mentions were identified mainly in news outlets and Mendeley readers, with the altmetric attention score ranging from 1 to 126.

Conclusions: This study identified an emerging trend in bulk-fill composite resin research in restorative dentistry. The greatest number of studies was published in Brazil, with a strong focus on laboratory studies aiming to investigate restoration quality and polymerization stress in high-viscosity composite resins of interest to Mendeley readers. Further clinical, observational, and systematic review studies are recommended.

Statement of problem: Grinding is often required for the clinical adjustments of zirconia restorations; nevertheless, the effects of following regeneration firing processes on additively manufactured zirconia are still unclear.

Purpose: The purpose of this in vitro study was to evaluate the effects of grinding and regeneration firing (RF) on the phase transformation and biaxial flexural strength (BFS) of additively or subtractively manufactured 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP).

Material and methods: A total of 108 disk-shaped (Ø15×1.5 mm) 3Y-TZP specimens (n=54) were fabricated using either subtractive manufacturing (SM) or additive manufacturing (AM) techniques. Grinding was performed using a 150-μm-grit diamond rotary instrument with a high-speed handpiece, and RF was carried out at 1000 °C for 15 minutes in a sintering furnace. The crystalline phases were analyzed using X-ray powder diffraction (XRD). All specimens were loaded until fracture using a universal testing machine for a biaxial flexural strength test at a crosshead speed of 1 mm/minute. Microstructure and fracture surfaces were examined using scanning electron microscopy. BFS data were statistically analyzed using 1-way ANOVA, followed by the Tukey post hoc test for pairwise comparisons. (α=.05). The Weibull modulus and characteristic strength were calculated to assess the reliability of strength data.

Results: Tetragonal-to-monoclinic phase transformation was detected in ground specimens of both AM and SM groups, whereas only the tetragonal phase was observed in their corresponding RF groups. The highest BFS (1427.2 MPa) was observed in ground AM specimens (P<.001). Grinding and RF did not significantly affect the BFS of SM zirconia (P=.927 and P=.999, respectively) but significantly increased the BFS of AM zirconia (P<.001). RF increased the Weibull modulus in both AM (from m=6.98 to 12.25) and SM (from m=5.91 to 8.35) zirconia.

Conclusions: The implementation of RF after grinding is crucial, particularly for AM zirconia, to improve mechanical strength and structural reliability.

This presentation combines a conceptual overview with a real clinical application. A 24-year-old woman, referred for esthetic enhancement, received porcelain veneers using the Bright Corus protocol. The outcome was biologically respectful, esthetically harmonious, and anatomically precise, with minimal human intervention and a high degree of predictability. This treatment exemplified how artificial intelligence-driven digitally assisted dentistry can enhance the reliability of restorative procedures by orchestrating a unified, precision-guided workflow.

Statement of problem: Denture hygiene is essential for oral health as acrylic resin roughness affects Candida albicans adhesion. Cleaning methods may alter surface properties, warranting further research to determine the most effective long-term approach.

Purpose: The aim of this in vitro study was to compare the effect of different denture cleaning procedures on the surface roughness and Candida adhesion of acrylic resins.

Material and methods: A total of 120 resin specimens were divided into 12 subgroups (n=10), including 3 materials, a heat-polymerized acrylic resin (Meliodent), an autopolymerized acrylic resin (Meliodent Rapid Repair), and a hard reline material (GC Reline Hard) and 4 cleaning methods, distilled water (control group), Corega alkaline peroxide-containing effervescent tablet, brushing, and electrolyzed water. Surface roughness values of the resin specimens were measured using a contact profilometer device before cleaning and after 7, 30, and 90 days. Candida adhesion was measured and colony forming units (CFU/mL) were assessed. Statistical analysis was performed by using 3-way ANOVA followed by the Bonferroni correction for the surface roughness data and the Kruskal-Wallis test for Candida colonization (α=.05).

Results: The surface roughness values of the 3 different acrylic resin materials decreased significantly 30 and 90 days after applying the denture cleaning procedures (P<.001). The denture cleaning procedure affected the surface roughness of heat-polymerized (P<.001) and autopolymerized resins after 90 days (P=.002). The surface roughness of the hard reline materials were affected by different cleaning procedures at all time intervals. Candida adhesion was significantly lower in all type of acrylic resin materials after immersion in alkaline peroxide-based cleansing tablets (P<.001).

Conclusions: According to the findings of this study, when evaluating surface roughness, the cleaning procedure with electrolyzed water may be an alternative to mechanical cleaning but should be improved in terms of removing Candida adhesion. Chemical cleaning with denture cleaning tablets was found to be optimal for long-term usage.