Journal of Prosthetic Dentistry最新文献

{"title":"Influence of pretreatment strategies on the tensile bond strength of 3D printed composite resins for definitive cementation to dentin","authors":"Lukas Montenbruck DMD ,&nbsp;Jörg Lüchtenborg Dipl Ing, PhD ,&nbsp;Moataz Elgezawi BDS, MSc, PhD ,&nbsp;Andreas Keßler DMD, MSc, PhD ,&nbsp;Dalia Kaisarly BDS, MSc, PhD","doi":"10.1016/j.prosdent.2025.04.043","DOIUrl":"10.1016/j.prosdent.2025.04.043","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Little is known about factors influencing the bond strength of additively manufactured materials in dentistry. The impact of diverse pretreatment strategies on the bond strength of 3-dimensionally (3D) printed composite resins indicated for definitive cementation to dentin has scarcely been investigated.</div></div><div><h3>Purpose</h3><div>The aim of this study was to evaluate the adhesive bond strength of two 3D printed definitive fixed restoration materials to dentin by using different pretreatment protocols.</div></div><div><h3>Material and methods</h3><div>Composite resin rods (2×2×10 mm, <em>n</em>=20/group) were 3D printed with 3Delta Crown and saremco print CROWNTEC. Half of the rods were airborne-particle abraded (APA), the other half of the rods were untreated. All rods were chemically conditioned with 1 of 3 adhesives (Adhese Universal, Heliobond, Monobond Plus). Dentin rods (2×2×5 mm) were cut from bovine teeth, pretreated with Adhese Universal, and bonded to the composite resin rods with Variolink Esthetic LC. The specimens were thermocycled (10 000 cycles) before testing for tensile bond strength (TBS) and the assessment of the failure mode. Surface roughness (SR) and degree of conversion (DC) were examined with laser scanning microscopy and Raman spectroscopy. Data were statistically analyzed with 1-, 2-, and 3-way analyses of variance (ANOVAs) and Weibull analysis (α=.05).</div></div><div><h3>Results</h3><div>TBS values ranged from 6.57 to 10.58 MPa, without significant differences among the groups (<em>P</em>&gt;.05). All groups demonstrated a comparable Weibull modulus and predominant adhesive failure. SR increased significantly (<em>P</em>&lt;.05) upon APA, and the DC ranged from 70.1% to 71.9%.</div></div><div><h3>Conclusions</h3><div>Regardless of the 3D printable material, SR was increased by APA, and the DC was around 70%. Different mechanical and chemical pretreatments appear to exert relatively little influence on TBS.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 842.e1-842.e11"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144111184","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 using a self-etching primer to repair resinous CAD-CAM materials: An in vitro study","authors":"Tatiana Chamba DDS ,&nbsp;Camila Falconí-Páez DDS, MS ,&nbsp;Alejandra Nuñez DDS, MS, PhD ,&nbsp;Camilo Pulido DDS, MS, PhD ,&nbsp;Paulina Aliaga-Sancho DDS ,&nbsp;Newton Fahl Jr DDS, MS ,&nbsp;Cesar Augusto Galvão Arrais DDS, MS, PhD ,&nbsp;Andrés Dávila-Sánchez DDS, MS, PhD","doi":"10.1016/j.prosdent.2025.05.004","DOIUrl":"10.1016/j.prosdent.2025.05.004","url":null,"abstract":"<div><h3>Statement of problem</h3><div>A consensus is lacking regarding the optimal surface treatment for repair protocols that ensures reliable bonding to computer-aided design and computer-aided manufacture (CAD-CAM) resin composite in intraoral applications.</div></div><div><h3>Purpose</h3><div><span>The purpose of this in vitro study was to compare the microshear bond </span>strength promoted by 3 bonding strategies to repair commercially available CAD-CAM resin composites.</div></div><div><h3>Material and methods</h3><div>Three CAD-CAM resin composites (Cerasmart, Brilliant, Tetric CAD) and a hybrid ceramic (Vita Enamic) were pre-aged for 5000 thermal cycles and allocated into groups according to surface repair treatments: hydrofluoric acid<span><span> etch, silane<span>, and Monobond Etch &amp; Prime, airborne-particle abrasion and Monobond Etch &amp; Prime, or only Monobond Etch &amp; Prime. Transparent Ø8×0.5-mm polyethylene tubes were placed on the treated surfaces and were filled with flowable resin composite. Half of the specimens (n=4) were microshear bond strength tested after 24 hours and the other half after thermal cycle testing, and the </span></span>surface topography was examined. Data were analyzed with 2-way repeated measures ANOVA and the Bonferroni test (α=.05)</span></div></div><div><h3>Results</h3><div>After 24 hours, for the Cerasmart, Tetric CAD, and Brilliant resin specimens, the Monobond Etch &amp; Prime strategy presented the lowest microshear bond strength values (<em>P&lt;</em>.003). In the Vita Enamic group, no differences were found among groups after 24 hours. After 10 000 cycles, values decreased in all groups (<em>P</em>&lt;.05). The airborne-particle abrasion with Monobond Etch &amp; Prime strategy promoted the highest values.</div></div><div><h3>Conclusions</h3><div>Airborne-particle abrasion combined with a single component self-etching primer provided a simplified clinical alternative for repairing resin-containing CAD-CAM materials.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 843.e1-843.e10"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144111181","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":"Comparison of marginal and internal fit of 10-unit fixed dental prostheses fabricated from cobalt chromium alloys or zirconia ceramics using digital workflows","authors":"Vera Malina Hupe DMD ,&nbsp;Florian Beuer DMD, PhD (Prof) ,&nbsp;Guido Sterzenbach DMD, PhD ,&nbsp;Ufuk Adali DMD","doi":"10.1016/j.prosdent.2025.05.008","DOIUrl":"10.1016/j.prosdent.2025.05.008","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Long-span fixed dental prostheses (FDPs) can be challenging to fabricate with adequate marginal and internal fit. The performance of restorations fabricated from cobalt chromium or zirconia using a completely digital workflow requires further evaluation to ensure clinical acceptability.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate and compare the marginal and internal fit of 10-unit FDPs fabricated from cobalt chromium or zirconia by using digital scanning and computer-aided design and computer-aided manufacturing (CAD-CAM).</div></div><div><h3>Material and methods</h3><div>Twenty-four complete arch digital scans of a typodont model with 6 prepared teeth were acquired to design and mill 12 cobalt chromium and 12 zirconia 10-unit FDP frameworks. For each framework, measurements from all 6 abutments and from both buccolingual and mesiodistal sections were pooled, yielding 1 mean value per measurement area per specimen. Marginal, chamfer, internal, and overall cement gaps were evaluated with the silicone replica technique. Trueness was defined as the difference between the measured gap and the preset cement spacer. Data were analyzed with 2-sample <em>t</em> tests on the pooled specimen means (α=.05).</div></div><div><h3>Results</h3><div>Mean gap measurements for cobalt chromium versus zirconia were (gap value ±standard deviation) as follows: marginal, 68.7 ±14.6 µm versus 53.3 ±11.8 µm; chamfer, 66.8 ±10.6 µm versus 58.1 ±10.8 µm; internal, 77.7 ±6.5 µm versus 95.8 ±9.4 µm; and overall cement gap, 74.2 ±8.2 µm versus 81.3 ±9.7 µm. The zirconia restorations exhibited a significantly smaller marginal gap (<em>P</em>=.01), whereas the cobalt chromium frameworks showed a significantly smaller internal gap (<em>P</em>&lt;.001), with the chamfer gap being statistically similar (<em>P</em>=.061). Zirconia demonstrated significantly higher trueness in the marginal area (<em>P</em>=.01), while the internal gap trueness did not differ significantly between the 2 materials (difference 1.9 µm, <em>P</em>=.56). Both materials remained below the 120 µm clinical threshold for acceptable fit.</div></div><div><h3>Conclusions</h3><div>A digital workflow yielded precise, clinically acceptable fit for 10-unit restorations fabricated from both cobalt chromium and zirconia. Zirconia demonstrated significantly higher marginal trueness, whereas the internal gap trueness did not differ significantly between the 2 materials. Optimizing cement spacer settings and evaluating deviations from the planned spacer are crucial for an accurate assessment of fit.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 761.e1-761.e8"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144159695","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":"In vitro evaluation of disinfection efficacy and physical properties of polyether impression material after ultraviolet-C radiation with different exposure times and distances","authors":"Tamonwan Chada DDS ,&nbsp;Aetas Amponnawarat DDS, MS, DScD ,&nbsp;Krid Kamonkhantikul DDS, PhD ,&nbsp;Woraporn Homsiang DDS, PhD","doi":"10.1016/j.prosdent.2025.05.029","DOIUrl":"10.1016/j.prosdent.2025.05.029","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Polyether<span> impression material may be susceptible to water absorption when exposed to chemical disinfectants, and ultraviolet-C (UV-C) radiation could serve as an alternative disinfection method. However, studies on the disinfection efficacy and physical properties of polyether material after UV-C radiation are lacking.</span></div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the disinfection efficacy, contact angle, and linear dimensional change of polyether impression material after exposure to UV-C radiation at varying times and distances.</div></div><div><h3>Material and methods</h3><div><span>Disk-shaped polyether specimens were fabricated and divided into 12 groups based on 2 distances (8 cm and 16 cm) and 6 disinfection methods: no UV (UV0), UV radiation for 2.5, 5, 10, or 30 minutes (UV2.5, UV5, UV10, and UV30), and a 10-minute immersion in 0.5% sodium hypochlorite (NaOCl). Disinfection efficacy against </span><span><em>Streptococcus mutans</em></span> and <em>Candida albicans</em>, contact angle, and linear dimensional change were evaluated. Data were analyzed using the 2-way ANOVA with exposure times and distances as main factors, followed by the Tukey honestly significant difference test (α=.05).</div></div><div><h3>Results</h3><div>For both microbes, the UV2.5, UV5, and UV10 groups at 8 cm exhibited a significant reduction in the number of residual microbial cells compared with those at 16 cm (<em>P</em>&lt;.001). Conversely, the UV0, UV30, and NaOCl groups showed no significant differences (<em>P</em><span>&gt;.05). Complete microbial eradication was achieved after 10 minutes of UV-C radiation at 8 cm and 30 minutes at 16 cm. Comparing exposure times, the number of residual </span><em>Streptococcus mutans</em> and <em>Candida albicans</em> cells significantly decreased as UV-C exposure time increased for both distances (<em>P</em>&lt;.001). All groups exhibited no significant differences in contact angle compared with the UV0 group at either distance (<em>P</em>&gt;.05), except for the UV30 group at 8 cm and the UV5, UV10, and UV30 groups at 16 cm. The percentage of dimensional change in all groups ranged from 0.11% to 0.31%, all of which were below the International Organization for Standardization specification limit of 1.5%.</div></div><div><h3>Conclusions</h3><div>A 10-minute UV-C radiation at 8 cm effectively disinfected polyether impression material, comparable with a 10-minute immersion in 0.5% NaOCl. A 30-minute UV-C radiation at either 8 or 16 cm effectively disinfected polyether impression material, enhanced surface wettability, and maintained dimensional stability.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 844.e1-844.e8"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144248434","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":"Editorial Review Board","authors":"","doi":"10.1016/S0022-3913(25)00634-1","DOIUrl":"10.1016/S0022-3913(25)00634-1","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Page A1"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926797","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":"Analysis of the marginal gap and internal fit accuracy of 3D printed zirconia crowns using the triple scan protocol","authors":"Rogina M. Hassan BDS ,&nbsp;Rewaa G. AboELHassan BDS, MS, PhD ,&nbsp;Amir Shoukry Azer BDS, MS, PhD","doi":"10.1016/j.prosdent.2025.04.036","DOIUrl":"10.1016/j.prosdent.2025.04.036","url":null,"abstract":"<div><h3>Statement of problem</h3><div><span>Zirconia restorations must achieve micrometer-level accuracy in both marginal and internal fit to ensure an adequate fit with the </span>abutments and to reduce the likelihood of clinical failure. Limited research exists on the fit accuracy of 3-dimensionally (3D) printed zirconia crowns, hindering the confirmation of additive manufacturing’s effectiveness in producing zirconia restorations.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to analyze the marginal gap and internal fit of zirconia crowns fabricated through 3D printing compared with those manufactured by traditional milling.</div></div><div><h3>Material and methods</h3><div><span>A mandibular typodont tooth was prepared to receive a monolithic zirconia crown, and 24 epoxy resin<span><span><span> replicas were obtained and scanned with a dental laboratory scanner. Using a computer-aided design (CAD) software program (Dental CAD 3.0; evoked GmbH), 24 identical zirconia crowns were designed and sent for additive (LithaCon 210 3y; Lithoz GmbH) and subtractive (Nacera Zirconia; Dental Direkt) manufacturing. The triple scan protocol was used to evaluate the marginal gap and internal fit of all zirconia specimens. All scans were obtained using a laboratory </span>optical scanner (Medit T710; Medit Corp). The resulting STL files of each specimen were superimposed and analyzed using a 3D analysis software program (Medit Design v.2.1.4; Medit Corp). </span>Heat maps were generated to represent all deviations. An independent (nonpaired) </span></span><em>t</em> test was performed to compare the fit of crowns fabricated with both techniques (α=.05).</div></div><div><h3>Results</h3><div>The 3D printed zirconia crowns exhibited a significantly higher marginal gap (87.7 ±7.4 µm) compared with the milled crowns (57.5 ±7.0 µm) (<em>P</em>&lt;.05). Similarly, the internal gap was greater in the 3D printed group (107.4 ±4.9 µm) than in the milled group (86.6 ±7.6 µm) (<em>P</em>&lt;.05).</div></div><div><h3>Conclusions</h3><div>While 3D printed zirconia crowns demonstrated higher marginal and internal gap values compared with the milled crowns, both types were within clinically acceptable limits.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 758.e1-758.e7"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144132584","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 ceramic type, cement shade, and ceramic thickness on the optical properties of the definitive restoration and the ability to mask a metal substructure","authors":"Hamidreza Rajati Haghi DDS ,&nbsp;Amir H. Nejat DDS, MS, MDS, CDT ,&nbsp;Hossein Dashti DDS ,&nbsp;Delaram Ghaemi DDS ,&nbsp;Faeze Saeedi DDS ,&nbsp;Sina Yarmoradian DDS","doi":"10.1016/j.prosdent.2025.05.015","DOIUrl":"10.1016/j.prosdent.2025.05.015","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The influence of ceramic type, cement shade, and ceramic thickness on the final color of the restoration and its masking ability is unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to investigate the effect of the ceramic type and translucency parameters, ceramic thickness, and cement shade on the color of the definitive restoration and its masking ability.</div></div><div><h3>Material and methods</h3><div><span><span>A total of 120 ceramic specimens were fabricated in different thicknesses and divided into 10 groups: high translucency zirconia (HTZ 0.8, 1.2, 1.6 and 2 mm) (ZX2 98; Dental Direct), porcelain-fused-to-zirconia (PFZ1.5 and 2 mm) (DD Bio ZW iso color High </span>Strength<span><span>; Dental Direkt), monolithic low translucency lithium disilicate (LT 1 and 1.5 mm) (e.max; Ivoclar AG), bilayered glass-ceramic with a high opaque lithium disilicate (HO 1.5 and 2 mm) (e.max; Ivoclar AG). The color and translucency of the specimens were measured based on the L*a*b values and remeasured after applying resin cement evaluation pastes (Panavia V5 Try in paste; Kuraray Dental) in 3 colors: A2, opaque (O), or white (W) over 2 background materials (nickel </span>chromium alloy or composite resin shade A2). The VITA Classic shade guide was used as the reference L*a*b value to evaluate the color matching capability of different ceramic-cement combinations. Color change (ΔE</span></span>_ab) was measured, and the perceptibility threshold (PT) was set at 2.6 and the acceptability threshold (AT) at 5.5.</div></div><div><h3>Results</h3><div>The mean ΔE of the specimens ranged from 0.4 to 4.5. The type of ceramic significantly affected the color and translucency parameter (<em>P</em>&lt;.001). In all groups, translucency decreased significantly with the increasing thickness of the ceramic (<em>P</em>&lt;.001). According to the perceptibility threshold, the color of the nickel chromium background could be concealed by all 2 shades of cement (A2, opaque, and white). Nevertheless, the LT 1-mm, LT 1.5-mm, HTZ 0.8-mm, and HTZ 1.2-mm groups exhibited noticeable color changes when opaque cement was applied. Specimens with lower translucency parameters had better color matching with the A2 color. The HTZ 0.8-mm A2, LT 1-mm A2, and HTZ 0.8-mm W groups showed the least color match, with mean ΔE values of 12.4, 11.9, and 11.3, respectively. However, the PFZ 2-mm O and PFZ 2-mm W groups exhibited the best color match, with mean ΔE values of 1 and 1.4.</div></div><div><h3>Conclusions</h3><div>The thickness of the ceramic had a significant effect on its translucency. Moreover, the translucency of the ceramic influenced its masking ability and had a direct correlation with the color change in the presence of cement. Ceramic materials with an opaque framework had lower translucency but better color matching with the reference shade.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 760.e1-760.e7"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144225791","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":"A completely digital workflow for PEEK removable partial dentures: A preliminary clinical study","authors":"Yongcheng Ge MS ,&nbsp;Ting Zhao DDS, PhD ,&nbsp;Sizheng Fan MS ,&nbsp;Pengyuan Liu MS ,&nbsp;Prof Xiaoqiu Liu DDS, PhD","doi":"10.1016/j.prosdent.2025.05.028","DOIUrl":"10.1016/j.prosdent.2025.05.028","url":null,"abstract":"<div><h3>Statement of problem</h3><div><span><span>The full-process digital polyetheretherketone (PEEK) </span>removable partial denture (RPD) has the potential to significantly improve patient treatment comfort and work efficiency. However, a comparison of the fit, </span>mastication efficiency, clinical efficacy, and patient satisfaction between completely digital and semidigital workflows for PEEK RPDs is needed to assess its benefits.</div></div><div><h3>Purpose</h3><div>The purpose of this preliminary clinical study was to compare the differences in the fit, mastication efficiency, clinical efficacy, and patient satisfaction between completely digital and semidigital workflows for PEEK RPDs.</div></div><div><h3>Material and methods</h3><div><span>Twenty participants with partial edentulism<span> were included in the study. Each received two types of RPD, one fabricated using a completely digital workflow and the other using a semidigital workflow. The completely digital group used intraoral scanning with a 3Shape scanner to obtain digital scans, followed by computer-aided design and computer-aided manufacturing (CAD-CAM) of the dentures. The semidigital group involved traditional polyvinyl siloxane<span> (PVS) impressions, gypsum casts, and the subsequent CAD-CAM processing of the dentures. PVS was used to replicate the gap between the oral mucosa and the RPD baseplate tissue in both groups, and 3-dimensional (3D) deviation analysis was used for measurements. Mastication efficiency was measured using the absorbance method, and patient satisfaction was evaluated via a questionnaire. </span></span></span><em>T</em> tests were conducted to compare the fit, mastication efficiency, clinical efficacy, and patient satisfaction between the two groups (α=.05).</div></div><div><h3>Results</h3><div>A significant difference in the fit was found between the baseplate tissue and oral mucosa at the distal extension of the RPD between the completely digital and semidigital PEEK RPDs (<em>P</em>=.038<em>, P</em>=.023), while no significant difference was observed at the nondistal extension end (<em>P</em>=.445<em>, P</em>=.331). No significant difference in mastication efficiency was found between the two groups (<em>P</em>=.448). The completely digital group reported higher comfort levels than the semidigital group (<em>P</em>&lt;.001). No significant differences in overall denture satisfaction were found between the two groups at 1, 2, and 3 months after restoration (<em>P</em>=.730<em>, P</em>=.463<em>, P</em>=.526).</div></div><div><h3>Conclusions</h3><div>Both completely digital and semidigital workflows for PEEK RPDs achieve good fit. The completely digital PEEK RPD significantly enhances patient comfort and work efficiency, making it a suitable option for broader application.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 791.e1-791.e8"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144234406","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":"Fabrication of facially guided CAD-CAM complete dentures: A dental technique","authors":"Guillermo Galván Lobo DDS ,&nbsp;Manel Cruz Vida CDT ,&nbsp;Nancy E. Hartrick DDS ,&nbsp;Guillermo Galván Guerrero DDS","doi":"10.1016/j.prosdent.2023.10.018","DOIUrl":"10.1016/j.prosdent.2023.10.018","url":null,"abstract":"<div><div><span>An alternative protocol is presented to design computer-aided design and computer-aided manufacturing (CAD-CAM) complete dentures and </span>overdentures<span><span> using a facially guided digital design. The facially guided design protocol with CAD-CAM facilitated communication between the clinician and dental laboratory technician. A monolithic denture and overdenture were fabricated guided by preliminary dentures with 3-dimensionally (3D) printed denture bases and milled </span>wax teeth.</span></div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 591-596"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138291253","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 geometric heterogeneity using an auxiliary device on the accuracy of complete arch implant scanning: An in vitro study of different clinical simulations","authors":"Aly Abdelrehim BDS, MSc ,&nbsp;Eshamsul Sulaiman BDS, MFD.RCS, MClinDent ,&nbsp;Hazrina Sofian BCompSc, MCompSc, PhD ,&nbsp;Nosizana Mohd Salleh DDS, PhD","doi":"10.1016/j.prosdent.2023.10.014","DOIUrl":"10.1016/j.prosdent.2023.10.014","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Intraoral scanning of implants supporting complete arch prostheses is limited because of the lack of geometric heterogeneity and unique reference points, creating inherent errors in the image stitching process by the scanner software program.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the significance of geometric heterogeneity on complete arch implant scanning by using a novel auxiliary geometric device. Three different clinical simulations were tested to assess its significance. The study also assessed whether scans produced using the auxiliary device would meet a clinically acceptable threshold.</div></div><div><h3>Material and methods</h3><div><span><span>A total of 60 scans (n=20) were performed using an intraoral scanner in 3 different clinical simulations: 2 parallel implants, 4 parallel implants, and 4 implants with a 30-degree posterior </span>angulation of the distal implants. Scanning alternated between using the auxiliary geometric scanning device (test groups; 4IP+, 4IA+, 2IP+) and not using the device (control groups; 4IP-, 4IA-, 2IP-). A reference scan for each model was prepared from a high precision laboratory scanner. The scans were analyzed for accuracy in 3-dimensional deviation, interimplant distance deviation, and angular deviation by using an inspection software program. The effect of the auxiliary device was statistically analyzed by comparing scans of the same group using the paired </span><em>t</em><span> test for normally distributed data and the Wilcoxon Signed Rank test when data were not normally distributed (α=.05).</span></div></div><div><h3>Results</h3><div>Significant effects of the auxiliary geometric device were found in 3-dimensional, distance and angular deviations (<em>P</em>&lt;.05). Scans performed using the device were significantly more accurate in most implant positions (<em>P</em>&lt;.05). Linear and angular deviations were clinically acceptable for all test groups. However, the deviations were above the clinically acceptable threshold for the control groups.</div></div><div><h3>Conclusions</h3><div>Using an auxiliary geometric device significantly improved scanning accuracy and produced scans with clinically acceptable deviations, while standard digital scans exceeded the accepted clinical threshold.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"134 3","pages":"Pages 765-773"},"PeriodicalIF":4.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138047212","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}