Bo Yang BDS, MDS, PhD , Xueling Li BDS, MDS , Yanshan Li BDS, MDS , Ling Yang BDS, MDS, PhD
{"title":"Application of virtual technology to maximize esthetics and function in the restoration of anterior traumatic dental injuries","authors":"Bo Yang BDS, MDS, PhD , Xueling Li BDS, MDS , Yanshan Li BDS, MDS , Ling Yang BDS, MDS, PhD","doi":"10.1016/j.prosdent.2023.09.025","DOIUrl":"10.1016/j.prosdent.2023.09.025","url":null,"abstract":"<div><div><span>The restoration of multiple teeth with traumatic injury in the esthetic zone is complex. For the present patient, an intraoral scanner, a facial scanner, a jaw motion analyzer, and </span>cone beam computed tomography were applied to collect patient data and establish a virtual dental patient. The virtual technology increased the accuracy of tooth- and implant-supported crowns in both appearance and occlusion.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 535-541"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49678762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Additive manufacturing of CAD-CAM complete arch fixed implant restorations supported by six implants: Prosthetic screw stability and marginal precision under masticatory simulation","authors":"Daniele Valente Velôso DDS, MSc, PhD , Thaís Barbin DDS, MSc, PhD , Letícia Del Rio Silva DDS, MSc, PhD , Valentim A.R. Barão DDS, MSc, PhD , Marcelo Ferraz Mesquita DDS, MSc, PhD , Guilherme Almeida Borges DDS, MSc, PhD","doi":"10.1016/j.prosdent.2025.04.042","DOIUrl":"10.1016/j.prosdent.2025.04.042","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Titanium frameworks for implant-supported fixed prostheses can be fabricated through subtractive or additive manufacturing using computer-aided design and computer-aided manufacturing (CAD-CAM) systems. However, the accuracy achieved by these technologies remains uncertain.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate complete arch maxillary fixed prostheses supported by 6 implants using CAD-CAM frameworks manufactured by milling and 3D printing technologies, selective laser melting (SLM), and electron beam melting (EBM) on the marginal fit and screw loosening torque before and after masticatory simulation.</div></div><div><h3>Material and methods</h3><div>Ti-6Al-4V frameworks were manufactured by milling, SLM, and EBM technologies (<em>n</em><span>=5) and were subsequently ceramic veneered. The surface topography of the framework was assessed by scanning electron microscopy and laser scanning confocal microscopy. One-way analysis of variance (ANOVA) was used to evaluate surface area. The specimens were further evaluated for the dependent variables (marginal fit and screw loosening torque) before and after masticatory simulation. Two-way repeated measures ANOVA and the Pearson correlation were performed (α=.05).</span></div></div><div><h3>Results</h3><div>Topographical analysis demonstrated that the milling group had a smooth surface (surface area: 1.17 ±0.02 µm<sup>2</sup>) with regular regions, while additive manufacturing groups showed a dendritic profile with higher surface area (SLM: 1.23 ±0.05 µm<sup>2</sup>; EBM: 1.21 ±0.03 µm<sup>2</sup>; <em>P</em><.05). A 2-way ANOVA found no interaction between technology and time (<em>P</em>>.05) for both dependent variables. Marginal fit showed no further significant differences regarding either the manufacturing technology or the evaluation time. Masticatory simulation reduced screw loosening torque (<em>P</em>=.032). Regarding manufacturing technology, milling resulted in a higher screw loosening torque compared with SLM (<em>P</em>=.01); however, no difference was observed between EBM and either SLM or milling (<em>P</em>>.05). A moderate correlation (<em>P</em>=.02) between marginal fit and screw loosening torque was observed only at baseline for the pooled CAD-CAM (milling, SLM, and EBM) specimens.</div></div><div><h3>Conclusions</h3><div>CAD-CAM complete arch fixed prostheses on 6 implants made by milling, SLM, and EBM exhibited marginal fit values below the acceptable error limits. Regarding prosthetic screw loosening torque, the pooled milled frameworks showed better values compared with SLM. After masticatory simulation, prosthetic screw stability decreased in all prostheses.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 783.e1-783.e9"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144127983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lea S. Prott DMD , Pablo J. Atria DDS, MSc, PhD , Caroline V. Maluf DDS, PhD , Markus B. Blatz DMD, PhD , Julian Conejo DDS, MSc
{"title":"In vitro comparison between complete arch abutment-level implant impressions with photogrammetry, grammetry, and intraoral scanning","authors":"Lea S. Prott DMD , Pablo J. Atria DDS, MSc, PhD , Caroline V. Maluf DDS, PhD , Markus B. Blatz DMD, PhD , Julian Conejo DDS, MSc","doi":"10.1016/j.prosdent.2025.05.009","DOIUrl":"10.1016/j.prosdent.2025.05.009","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Photogrammetry (PG) has emerged as a promising recording technique for fabricating implant-supported prostheses. However, the existing evidence on the accuracy of dental PG devices is still limited.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the trueness and precision of a newly introduced advanced PG device (MicronMapper; SIN 360) by comparing it with grammetry and intraoral scanning.</div></div><div><h3>Material and methods</h3><div>Four implants (BioHorizons) were placed in an edentulous mandibular model. Multi-unit abutments (BioHorizons) were positioned and tightened to 30 Ncm. A digital reference cast (Control group) was obtained by scanning the model with a laboratory scanner (inEosX5; Dentsply Sirona). Three test groups were evaluated: PS (Primescan), PS-OS (Primescan and OptiSplint), and PG (MicronMapper; SIN 360). Test files were superimposed with the reference file (trueness) and pairwise within groups (precision) using a 3D evaluation software program (Geomagic Control X). Root mean square (RMS) values were calculated. Analysis of variance (ANOVA) was used to analyze differences in RMS values among groups (α=.05), followed by the Tukey post hoc test.</div></div><div><h3>Results</h3><div>For trueness, group PG showed the lowest mean ±standard deviation RMS values (20.5 ±0.6 µm), followed by PS-OS (30.9 ±16.8 µm) and PS (56 ±0.7 µm). A statistically significant difference was found between groups PG and PS (<em>P</em><.001), as well as PS-OS and PS (<em>P</em>=.004). For precision, the lowest RMS values were detected in group PG (6 ±1.2 µm), followed by PS (9.5 ±3.3 µm) and PS-OS (23.3 ±22.3 µm). No statistically significant differences were detected among the test groups in terms of precision (<em>P</em>=.192).</div></div><div><h3>Conclusions</h3><div>Photogrammetry obtained the best accuracy. Grammetry improves the trueness; however, it appears to have no positive impact on the precision of complete arch implant recordings.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 782.e1-782.e7"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144127966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adam Hamilton BDSc, DCD, FRACDS , Samuel Akhondi DMD , Kevser Pala DMD , Diandra Luz DDS , German O. Gallucci Dr med dent, PhD
{"title":"Using postoperative CBCT to enhance preoperative planning integration in complete arch implant rehabilitation","authors":"Adam Hamilton BDSc, DCD, FRACDS , Samuel Akhondi DMD , Kevser Pala DMD , Diandra Luz DDS , German O. Gallucci Dr med dent, PhD","doi":"10.1016/j.prosdent.2025.04.047","DOIUrl":"10.1016/j.prosdent.2025.04.047","url":null,"abstract":"<div><div>In biorestoratively driven implant treatment planning, the initial prosthetic design is determined before implant placement. However, in patients with a terminal dentition, the loss of vertical dimension after tooth extraction and the absence of reference teeth complicate the alignment of the prosthetic design with the postextraction clinical situation, as well as precise occlusal registration and optimal tooth positioning. This article introduces a novel workflow that employs an additional cone beam computed tomography (CBCT) scan after implant placement to enhance data alignment, prosthetic rehabilitation, and occlusal registration for complete arch immediate loading of dental implants. By integrating preoperative and postoperative CBCT scans and utilizing stable bony landmarks as reference structures, this method effectively transfers preoperative planning into the postoperative intraoral environment. Unlike removable appliances or fiduciary markers, which are prone to misalignment, this technique ensures accurate prosthesis insertion with minimal adjustments, is adaptable to various workflows, including freehand implant placement, and provides a reliable and versatile solution to optimizing the outcomes of implant-supported prostheses.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 580-585"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144225722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Diego Guimarães Saraiva DDS, MSD , Luis Felipe Jochims Schneider DDS, MSD, PhD , Juliana Nunes da Silva Meirelles Doria Maia DDS, MSD, PhD , Luise Gomes da Motta DDS, MSD, PhD , Larissa Maria Assad Cavalcante DDS, MSD, PhD
{"title":"Effect of surface treatment protocols on the maintenance of a light-activated characterization coating for 3D printable composite resin","authors":"Diego Guimarães Saraiva DDS, MSD , Luis Felipe Jochims Schneider DDS, MSD, PhD , Juliana Nunes da Silva Meirelles Doria Maia DDS, MSD, PhD , Luise Gomes da Motta DDS, MSD, PhD , Larissa Maria Assad Cavalcante DDS, MSD, PhD","doi":"10.1016/j.prosdent.2025.05.026","DOIUrl":"10.1016/j.prosdent.2025.05.026","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Effective methods for improving the maintenance of light-activated characterization coatings for 3-dimensionally (3D) printable composite resin need to be investigated, and an appropriate working protocol must be established.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to determine the effect of treatment protocols on the maintenance of characterization coating in 3D printed dental restorations by focusing on preserving color stability and gloss retention to support clinical longevity.</div></div><div><h3>Material and methods</h3><div>Fifty disk-shaped (Ø12×2 mm) specimens were prepared with a 3D printable composite resin and divided into 10 groups (n=5) according to the surface treatment (aluminum oxide airborne-particle abrasion, phosphoric acid, silane, or adhesive). They were coated with a light-activated characterization and a sealant. Color stability, surface roughness, and gloss tests were conducted before and after a toothbrushing abrasion simulation (20 000 cycles). Color change (ΔE00, based on the CIE2000 standard) was measured using a spectrophotometer, surface roughness (Ra) with a profilometer, and gloss (GU) with a glossmeter. Two-way repeated measures analyses of variance (ANOVA) followed by Tukey post hoc tests (α=.05) were used to analyze the results for roughness and gloss before and after toothbrush abrasion. One-way ANOVA followed by the Tukey post hoc test was used for color difference.</div></div><div><h3>Results</h3><div><span>Before the brushing simulation, the group that used the complete surface treatment protocol exhibited the lowest Ra values. After brushing, no statistically significant differences were observed (</span><em>P</em>>.05). Groups to which adhesive had not been applied and those treated exclusively with characterization and sealant exhibited the highest gloss values before the simulation. However, no difference in gloss values was found among the groups after brushing, except for the control group, which showed the lowest values. High color changes were observed in groups where adhesive or silane was applied separately without abrasion beforehand.</div></div><div><h3>Conclusions</h3><div>Overall, the surface treatments applied resulted in lower roughness and higher gloss. However, they led to treatments with reduced color stability compared with those without the characterization agent.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 840.e1-840.e7"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144302417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Se Hun Chung PhD , Kathryn Chamberlain PhD , Keith Winwood PhD , Trevor J. Coward PhD
{"title":"Evaluation of methodologies and additive efficacy on maxillofacial color longevity research: A systematic review and meta-analysis","authors":"Se Hun Chung PhD , Kathryn Chamberlain PhD , Keith Winwood PhD , Trevor J. Coward PhD","doi":"10.1016/j.prosdent.2025.05.011","DOIUrl":"10.1016/j.prosdent.2025.05.011","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The lifespan of maxillofacial silicone elastomer-based prostheses can be as short as 6 months, primarily because of sunlight-induced color degradation. Efforts to enhance color stability have led to incorporating additives that include nanoparticles, opacifiers, and ultraviolet (UV) blockers. However, variability in testing methods and the absence of standardized protocols have led to inconsistent findings, underscoring the need for uniform testing to evaluate the color stability of these materials effectively.</div></div><div><h3>Purpose</h3><div>The purpose of this systematic review and meta-analysis was to assess the methodologies used in maxillofacial color longevity research and to synthesize findings on the effectiveness of additives in enhancing the color stability of pigmented silicone formulations exposed to solar radiation.</div></div><div><h3>Material and methods</h3><div>This systematic review, adhering to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, evaluated the impact of additives on color stability under solar radiation. Searches across PubMed, Web of Science, Embase, Scopus, and Cochrane databases (up to October 2024) followed the Population, Intervention, Comparator, Outcomes (PICO) criteria, limited to English-language studies. Articles were evaluated using a modified Consolidated Standards of Reporting Trials (CONSORT) guideline and quality-assessed with the Newcastle-Ottawa Scale, with high-quality studies (scoring 6 to 9) eligible for meta-analysis. A random-effects model in the RevMan Web tool was used, with heterogeneity assessed via the I² test and results presented in forest plots with 95% confidence intervals.</div></div><div><h3>Results</h3><div>A lack of standardized protocols persists in methodologies concerning specimen dimensions and pigmentation formulations, despite established weathering methods for both outdoor and artificial conditions. The meta-analysis demonstrated consistent improvements in color stability with additives under artificial weathering (<em>P</em><.001), while no significant improvement was observed during a 3-month period of outdoor weathering (<em>P</em>=.120). High heterogeneity across studies was observed, largely associated with variability in silicone pigmentation formulations.</div></div><div><h3>Conclusions</h3><div>Additives including nanoparticles, opacifiers, and UV blockers enhance the color stability of maxillofacial prostheses; however, the inherent stability of pigments remains a critical factor. Future research should focus on developing standardized testing methods tailored to maxillofacial applications, ensuring representativeness for prostheses and accounting for silicone formulation parameters relative to UV penetration.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 850-863"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144225719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amanda de Menezes Porto DDS , Matheus Vieira Nascimento DDS, MSc , Bruna Albuquerque Garcia DDS, MSc, PhD , Karina Matthes de Freitas Pontes Assoc Prof, DDS, MSc, PhD , Fábio Wildson Gurgel Costa DDS, MSc, PhD , Wagner Araújo de Negreiros DDS, MSc, PhD
{"title":"Marginal adaptation of tooth-supported fixed restorations fabricated using digital scanning versus conventional impression techniques: An overview of systematic reviews","authors":"Amanda de Menezes Porto DDS , Matheus Vieira Nascimento DDS, MSc , Bruna Albuquerque Garcia DDS, MSc, PhD , Karina Matthes de Freitas Pontes Assoc Prof, DDS, MSc, PhD , Fábio Wildson Gurgel Costa DDS, MSc, PhD , Wagner Araújo de Negreiros DDS, MSc, PhD","doi":"10.1016/j.prosdent.2025.05.044","DOIUrl":"10.1016/j.prosdent.2025.05.044","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Marginal adaptation is critical for oral health and the longevity of fixed prostheses. Conventional impression techniques frequently face challenges in accurate margin reproduction and soft tissue management. Although digital scanning offers enhanced speed, ease, and precision, whether these advantages translate into better marginal adaptation remains unproven.</div></div><div><h3>Purpose</h3><div>The purpose of this study was to analyze systematic reviews comparing the marginal adaptation of tooth-supported fixed restorations fabricated using digital scanning versus conventional impression making.</div></div><div><h3>Material and methods</h3><div>A comprehensive literature search, without language restrictions, was conducted in the PubMed, Scopus, Web of Science, EMBASE, and Google Scholar databases. The review included systematic reviews, with or without meta-analyses, evaluating primary studies on digital scanning and conventional impression making for marginal adaptation of fixed prostheses in in vivo and in vitro settings.</div></div><div><h3>Results</h3><div>Of the 18 selected articles, 11 included meta-analyses. Four of 10 articles in vivo and 4 of 7 articles in vitro reported better marginal adaptation with digital scanning. For zirconia, digital techniques outperformed conventional methods in 4 of 5 in vivo studies (SMDs from -0.89 to 27.2) and in all in vitro studies. For lithium disilicate and cobalt chromium restorations, no significant differences emerged. Regarding prosthesis types, 4 of 6 in vivo studies and 3 of 5 in vitro studies favored digital scanning for single-unit crowns. For partial fixed prostheses, 2 of 3 studies in both in vivo and in vitro settings supported digital superiority. No study reported that the conventional technique was better. However, most articles were rated \"critically low\" or \"low\" in quality by Assessing the Methodological Quality of Systematic Reviews (AMSTAR) 2, highlighting methodological limitations.</div></div><div><h3>Conclusions</h3><div>Digital scanning delivered equivalent or better marginal adaptation than conventional impression making, excelling with zirconia and for single or partial fixed prostheses. No evidence favored conventional methods, positioning digital scanning as a practical choice despite challenges like cost and saliva interference. Future studies should address methodological flaws to bolster evidence.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 629.e1-629.e13"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144560412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liwei Wu BS , Jiayang Zhang BS , Toru Ogawa DDS, PhD , Wanqian Zheng BS , Ke Cai BS , Yeting Yang BS , Sheng Zheng DDS, PhD
{"title":"Marginal and internal fit of zirconia crowns fabricated by advanced custom jetting and digital intraoral scanning: An in vitro study","authors":"Liwei Wu BS , Jiayang Zhang BS , Toru Ogawa DDS, PhD , Wanqian Zheng BS , Ke Cai BS , Yeting Yang BS , Sheng Zheng DDS, PhD","doi":"10.1016/j.prosdent.2025.05.042","DOIUrl":"10.1016/j.prosdent.2025.05.042","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Advanced custom jetting (ACJ) is an innovative high-precision 3-dimensional (3D) printing process for zirconia crowns, and digital scanning has gained widespread adoption in dentistry. However, the impact of different recording methods (conventional silicone versus digital scanning) on the marginal and internal fit of ACJ-fabricated zirconia crowns after cementation under simulated clinical conditions on extracted teeth remains unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate and compare the effects of silicone impressions and digital scanning, as well as subtractive manufacturing (SM) and ACJ, on the marginal and internal fit of zirconia crowns under simulated clinical conditions.</div></div><div><h3>Material and methods</h3><div>Thirty-six mandibular first molars were prepared by a prosthodontist and randomly assigned to 3 groups. The crowns were fabricated using 3 methods: silicone impression combined with SM (SS), digital scanning combined with SM (DS), and digital scanning combined with ACJ (DA). After cementing the crowns, the specimens were placed in a water bath for 24 hours. A sectioning technique was used to select and polish the 3 central sections of each specimen. Marginal, axial, angular, and occlusal fits were measured and analyzed using the MANOVA statistical test (α=.05).</div></div><div><h3>Results</h3><div>Statistically significant differences in marginal, angular, and occlusal discrepancies were observed among the 3 groups (<em>P<</em>.001). The DA group exhibited the lowest marginal (47.5 ±17.2 µm), angular (68.8 ±23.2 µm), and occlusal (87.7 ±40.1 µm) discrepancies, while the SS group displayed the highest values (79.9 ±31.2 µm, 144.4 ±56.9 µm, and 206.7 ±63.7 µm, respectively). For axial discrepancies, the DA group showed significantly lower values (52.9 ±16.8 µm) compared with the SS group and DS group (<em>P<</em>.001). These findings indicate that the DA group achieved better marginal and internal fit than the SS group and the DS group.</div></div><div><h3>Conclusions</h3><div>ACJ demonstrated better marginal and internal fit than SM techniques. The DA group consistently exhibited the lowest discrepancy values, underscoring the combined potential of ACJ and digital scanning in achieving high precision zirconia crowns.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 759.e1-759.e7"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144564919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluating risk factors associated with poor removable prosthesis hygiene in community-dwelling elders: A cross-sectional study","authors":"Tong Wah Lim BDS, MClinDent, MProsRCS , Michael Francis Burrow BDS, DDSc, MDS, PhD , Colman McGrath BA, BDentSc, MSc, PhD","doi":"10.1016/j.prosdent.2023.09.033","DOIUrl":"10.1016/j.prosdent.2023.09.033","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Removable dental prosthesis cleanliness is multifactorial, and key clinical and nonclinical factors associated with prosthesis hygiene should be identified to inform practice, particularly given the dearth of studies relating specifically to prosthetic factors and prosthesis cleanliness.</div></div><div><h3>Purpose</h3><div>The purpose of this cross-sectional clinical study was to evaluate removable dental prosthesis cleanliness among community-dwelling elders by using a semi-automated planimetric assessment and to determine factors associated with removable prosthesis cleanliness.</div></div><div><h3>Material and methods</h3><div>The cross-sectional study was conducted among community-dwelling elders wearing removable prostheses. Digital images of plaque on removable prostheses were made after staining with a plaque-disclosing agent by using a single-lens reflex camera with a standardized arrangement. The area of plaque coverage was quantified by using a semi-automated planimetric assessment method. Participant profiles were recorded, including sociodemographic and prosthesis-related variables. Variations in removable prosthesis cleanliness were determined in bivariate and regression analyses with the forward Wald test (α=.05).</div></div><div><h3>Results</h3><div>A total of 97 community-dwelling elders attending a hospital dental clinic were recruited (41 men and 56 women). The mean percentage of prostheses covered with plaque was 24.8%, and 42 (43.3%) were deemed ‘unclean’ (plaque coverage>25%). Bivariate analyses identified numerous prosthesis-related factors associated with prosthesis cleanliness (<em>P</em><span><span><.05) including prosthesis age, prosthesis material, prosthesis retention and stability, prosthesis fit, and presence of </span>denture stomatitis<span>. Logistic regression analysis indicated that prosthesis fit was the key factor associated with prosthesis cleanliness, accounting for sociodemographic and other prosthesis-related factors (</span></span><em>P</em><.001). Prostheses that were classified as completely ill-fitting were 12 times more likely to be unclean (OR=12.03; 95% CI 3.33–43.41) than those in the well-fitting group.</div></div><div><h3>Conclusions</h3><div>Among a community-dwelling sample of older individuals attending a teaching hospital, approximately half had unclean prostheses as identified by the semi-automated planimetric method. Prosthesis fit was a key factor associated with prosthesis cleanliness. The findings have implications for maintaining removable prosthesis hygiene in the community.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 723-729"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136094528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of stabilization of patients on the accuracy and scanning time of maxillary dentate quadrants: A clinical study","authors":"Elia Daccache DDS , Carole Abi Ghosn Yared DDS, MSc, PhD , Lara Nasr DDS, MS, MPH , Ghida Laawand BDS, MSc , Hani Tohme DDS, MSc, PhD","doi":"10.1016/j.prosdent.2023.09.022","DOIUrl":"10.1016/j.prosdent.2023.09.022","url":null,"abstract":"<div><h3>Statement of problem</h3><div>As intraoral scanning has gained widespread acceptance as an alternative to conventional impression-making, numerous studies have evaluated the influence of operator-related factors and patient-related factors on scanning accuracy. While several authors have noted patient movements as a clinical limitation of scanning technologies, research providing empirical data or testing this hypothesis is lacking.</div></div><div><h3>Purpose</h3><div><span>The purpose of this clinical study was to assess the effect of using the Zero Motion Scanning Band, a silicone occlusal </span>mouth prop, and an OptraGate lip retractor for stabilizing the head and jaw on the accuracy (trueness and precision) and scanning time of digital quadrant scans.</div></div><div><h3>Material and methods</h3><div>A conventional impression was made of the maxillary right quadrant with polyvinyl siloxane<span> material and then digitized using a calibrated extraoral scanner to create the reference file. Two different groups were created: no scanning aids (NSA) and with scanning aids (WSA). For the NSA group, scans were made without considering the participant’s movements. For the WSA group, scans included the Zero Motion Scanning Band, a silicone occlusal mouth prop, and an OptraGate lip retractor. Sixty-four scans were captured with an intraoral scanner (TRIOS 3) for each group, and the scanning time was recorded. Using an inspection and metrology software program, scans of each group were superimposed on the reference file to determine 3-dimensional (3D) deviations. The Kolmogorov-Smirnov test evaluated the normality of the distribution of variables, and the Mann-Whitney U test was selected for data analysis of non-normally distributed variables, including 3D deviations and scanning time (α=.05).</span></div></div><div><h3>Results</h3><div>Significant differences for trueness and scanning time mean values were observed under different scanning conditions: with and without head and jaw positioning (<em>P</em><.05). The modified scan protocol exhibited higher trueness, with smaller mean root mean square values of 38.4 ±2.7 µm compared with 40.8 ±3.1 µm in the nonmodified group. However, precision did not display a statistically significant difference with varying scanning conditions (<em>P</em>>.05).</div></div><div><h3>Conclusions</h3><div>The use of the Zero Motion Scanning Band, a lip retractor, and a silicone occlusal mouth prop on the contralateral side of the scanned quadrant significantly improved the trueness and scanning time of the quadrant digital scan. Further evaluation of head and jaw stabilizing tools is recommended in more complex clinical scenarios, such as complete arch digital scans and scanning implant-supported restorations.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 678-685"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136127179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}