Journal of Advanced Prosthodontics最新文献

{"title":"Factors associated with successful removable partial denture treatment: an analysis of clinical outcomes and post-insertion events.","authors":"Navodika Yaparathna, Ruvini Hattiarachchi, Iresha Udayamalee, Chamilka Bandaranayake, Santosh Kumar Tadakamadla, Steve An, Menaka Abuzar","doi":"10.4047/jap.2026.18.3.227","DOIUrl":"10.4047/jap.2026.18.3.227","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this research was to evaluate the clinical, functional, and esthetic outcomes of removable partial dentures (RPDs), as well as post-insertion events, and to identify the potential factors and their multifactorial interactions that influence overall RPD success, using real-world, evidence-based support better evidencebased clinical practice in RPD treatment.</p><p><strong>Materials and methods: </strong>A retrospective analysis was performed using data from a university dental clinic's electronic patient management system. Ten outcomes and 23 variables related to patient, oral status, denture, and clinical process were assessed using bivariate tests and logistic regression.</p><p><strong>Results: </strong>The study included 317 patients aged 34 - 90 years (mean age 69.7), with most patients aged 56 - 75 years (53.63%). Significant predictors of RPD success included the arch receiving the prosthesis, the opposing arch configuration, and the number of post-insertion visits. Single-arch dentures showed higher success. Lower RPDs opposed by complete maxillary dentures and cases involving RPDs in both arches showed reduced success. Maxillary RPD success decreased as the number of missing maxillary teeth increased and more pre-insertion visits were required. The Kennedy classification influenced outcomes only in the maxilla, with Class II and III demonstrating higher success than Class I. No other assessed variables showed significant associations, although descriptive patterns suggested variation across age groups.</p><p><strong>Conclusion: </strong>These findings highlight the multifactorial nature of RPD success, the predictive value of post-insertion events, and the need to assess the maxilla and mandible both separately and together, as different factors influence success in each arch.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 3","pages":"227-240"},"PeriodicalIF":2.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13346852/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148426109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From accuracy to clinical meaning in prosthodontic research.","authors":"In-Sung Luke Yeo","doi":"10.4047/jap.2026.18.2.67","DOIUrl":"10.4047/jap.2026.18.2.67","url":null,"abstract":"","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"67-69"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136564/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Denture trueness and subjective retention analysis of digital monolithic dentures.","authors":"Eman Assem Ibrahim, Kenda Ibrahim Hisham Hanno, Eman Alrafah, Ahmed Mohamed Abdelhamid","doi":"10.4047/jap.2026.18.2.80","DOIUrl":"10.4047/jap.2026.18.2.80","url":null,"abstract":"<p><strong>Purpose: </strong>The aim is to evaluate the trueness and displacement of tooth position as well as subjective retention of the monolithic complete denture (CD).</p><p><strong>Materials and methods: </strong>Twenty-two completely edentulous patients received (n = 22) conventional heat polymerized acrylic CDs. The conventional dentures were scanned with desktop scanner (Medit T710; MEDIT corp.), and the files were sent for milling of monolithic discs (Ivotion, Ivoclar vivadent AG). The files of the scanned monolithic dentures were superimposed with reference scans of conventional dentures to evaluate trueness by using analytic software (Geomagic control X 2020). The amount and direction of tooth displacement were measured by superimposing the scanned monolithic and conventional dentures to the scanned reference waxed trial dentures through points on denture teeth. Retention was subjectively evaluated. Data were analyzed.</p><p><strong>Results: </strong>For the maxillary and mandibular arches, there was a statistically significant difference in the intaglio and cameo surfaces between the conventional and monolithic CDs. As for the deviation of the teeth position, there was a statistically significant difference between the conventional and monolithic CDs in both maxillary and mandibular teeth. Regarding subjective retention, mandibular monolithic CDs differed significantly from conventional CDs.</p><p><strong>Conclusion: </strong>A difference was observed between the conventional heat polymerized and monolithic CDs at intaglio, cameo surfaces, and tooth position displacement. More deviation was induced by the cameo surfaces than by the intaglio surfaces, and the shell geometry did not the conventional CD. Practitioner evaluations indicated that monolithic dentures demonstrated superior retention relative to conventional dentures.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"80-91"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136586/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing adhesive protocols for CAD-CAM restorations: Is simplification a reliable alternative to conventional silane application?","authors":"Soner Sismanoglu","doi":"10.4047/jap.2026.18.2.131","DOIUrl":"10.4047/jap.2026.18.2.131","url":null,"abstract":"<p><strong>Purpose: </strong>This <i>in vitro</i> study compared the bond strength and surface morphology of CAD-CAM restorative materials treated with different silane-based strategies, evaluating the influence of material type and artificial aging.</p><p><strong>Materials and methods: </strong>Five CAD-CAM materials were evaluated: leucite-reinforced glass ceramic (LEU), lithium disilicate (LDS), zirconia-reinforced lithium silicate (ZLS), polymer-infiltrated ceramic network (PICN), and resin nanoceramic (RNC). A total of 315 specimens (63 per material) were assigned to five groups: conventional silane application (G1, positive control), silane-containing universal adhesive (G2), single-step cementation with silane-containing self-adhesive resin cement (G3), self-etching ceramic primer (G4), and no silane application (G5, negative control). Two resin cylinders were bonded to each specimen and tested either immediately or after 10,000 thermal cycles. Micro-shear bond strength testing was performed, failure modes were analyzed microscopically, and representative specimens were examined by scanning electron microscopy. Statistical analysis was conducted using linear mixed-effects models with post-hoc Tukey tests and planned contrasts (α = .05).</p><p><strong>Results: </strong>Material type, bonding strategy, aging, and their interactions significantly affected bond strength (<i>P</i> < .001). The conventional protocol (G1) consistently yielded the highest values across all materials, while negative controls showed the lowest. Simplified strategies demonstrated intermediate values that were generally lower than G1 but remained within clinically acceptable ranges (15 - 25 MPa). Thermal cycling reduced bond strength in all groups, although the relative ranking of protocols was preserved. SEM analysis revealed material-dependent surface characteristics.</p><p><strong>Conclusion: </strong>The conventional three-step silane protocol remains the most reliable approach for durable bonding, while simplified strategies may represent acceptable alternatives depending on the material.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"131-144"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136565/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differential effects of abutment contamination within an internal hexagonal connection on preload formation and load-dependent preload loss.","authors":"Minji Sun, Jihoon Shin, Yeseul Park, June Sung Shim, Jaeyoung Kim","doi":"10.4047/jap.2026.18.2.145","DOIUrl":"10.4047/jap.2026.18.2.145","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this <i>in vitro</i> study was to quantitatively evaluate the effect of surface contamination within an internal hexagonal implant-abutment connection on preload formation and preload loss under cyclic loading conditions.</p><p><strong>Materials and methods: </strong>Internal hexagonal implant-abutment assemblies were divided into three groups according to the degree of surface contamination: no contamination (CT0), partial contamination (CT3), and extensive contamination (CT6). Reverse torque values were measured after initial tightening to assess preload formation (pre-RTV). Specimens were then subjected to cyclic loading, after which post-loading reverse torque values were recorded (post-RTV), and absolute torque loss (ΔRTV) was calculated. Surface alterations were qualitatively assessed using scanning electron microscopy (SEM). Statistical analyses were performed to compare torque-related outcomes among groups.</p><p><strong>Results: </strong>Pre-RTV were significantly lower in the contaminated groups than in the uncontaminated control (<i>P</i> < .001), with no significant difference between CT3 and CT6. After cyclic loading, post-RTV decreased progressively with increasing contamination (<i>P</i> < .001). ΔRTV was significantly greater in CT6 than in CT0 and CT3 (<i>P</i> < .001), whereas no significant difference was observed between CT0 and CT3. SEM revealed localized surface wear at line angles in contaminated specimens, whereas uncontaminated specimens exhibited minimal surface alteration.</p><p><strong>Conclusion: </strong>Surface contamination within an internal hexagonal implant-abutment connection adversely affects joint stability through two distinct mechanical stages. While the presence of contamination primarily compromises initial preload formation, extensive contamination accelerates preload loss under cyclic loading. These findings suggest that even subtle contamination, often overlooked clinically, may have meaningful implications for implant-abutment stability.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"145-154"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136577/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of subgingival finish line reproduction in intraoral scanning versus conventional impressions: a randomized crossover clinical study with/without gingival retraction.","authors":"Prajakta Raghudas Volvaikar, Kennedy Mascarenhas, Meena Ajay Aras, Aradhana Nagarsekar, Mitalee Mopkar, Ridhima Gaunkar, Anushka Kunkolienkar","doi":"10.4047/jap.2026.18.2.92","DOIUrl":"10.4047/jap.2026.18.2.92","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the competence of intraoral scanners in recording subgingival finish lines compared with conventional impressions, with and without gingival retraction.</p><p><strong>Materials and methods: </strong>A randomized crossover, clinical trial was conducted on 15 participants. Mandibular first molars were prepared for full-coverage crowns, and four impression techniques were performed: digital without retraction (DWR), digital with retraction (DR), conventional without retraction (CWR), and conventional with retraction (CR). A 1-week washout separated digital and conventional methods. STL files were generated and superimposed using a best-fit algorithm. Measurements were made at three sites (B-buccal, M-mesial, D-distal) for finish line width(1), depth(2), and gingival retraction(3).</p><p><strong>Results: </strong>Significant intergroup differences were noted in B3, M1, M3, and D3. In these subgroups, DWR consistently demonstrated lower reproducibility. In B3, DR and CR were significantly better than DWR. In M1 and D3, DR, CWR, and CR showed significantly superior reproduction compared to DWR. In M3, CR showed significantly better results than DWR. Other parameters were comparable across groups.</p><p><strong>Conclusion: </strong>Digital and conventional impressions demonstrated higher reproducibility for shallow subgingival finish lines when gingival retraction was done. Without gingival retraction, finish line reproduced by conventional impressions was more defined than digital, underscoring the importance of retraction for reliable digital capture of subgingival margins.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"92-102"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136547/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trueness and the amount of clinical adjustment for zirconia crowns fabricated by digital light processing at different build angles: a within-patient clinical study.","authors":"Gyeong-Min Kim, KeunBaDa Son, Yoon-Jeong Shin, So-Yeun Kim, Gyu Ri Kim, Kyoung-Jun Jang, Jun Ho Hwang, Jong Hoon Lee, Hyun Deok Kim, Kyu-Bok Lee","doi":"10.4047/jap.2026.18.2.103","DOIUrl":"10.4047/jap.2026.18.2.103","url":null,"abstract":"<p><strong>Purpose: </strong>This clinical study evaluated the effect of build angle (0°, 45°, and 90°) in digital light processing (DLP) printing on the trueness and chairside adjustment of zirconia crowns and compared these outcomes with conventionally milled crowns.</p><p><strong>Materials and methods: </strong>Ten patients each received one milled zirconia crown and three DLP-printed zirconia crowns fabricated at 0°, 45°, and 90° build angles (40 crowns total; four crowns per patient). Trueness was calculated as the root mean square (RMS) surface deviation between intraoral scans of the crowns and the CAD design. Occlusal and intaglio adjustments were quantified as the RMS deviation between pre- and post-adjustment scans. Data were analyzed using linear mixed-effects models with manufacturing method as a fixed effect and patient as a random intercept to account for within-patient clustering. Post hoc comparisons were performed using Tukey-adjusted pairwise contrasts of estimated marginal means (α = .05).</p><p><strong>Results: </strong>Manufacturing method significantly influenced trueness in the primary linear mixed-effects model (χ² = 20.689, <i>P</i> = .001). Tukey-adjusted contrasts showed lower RMS for the 0° group (49.0 µm) than for the 45° group (63.3 µm; <i>P</i> = .033), 90° group (70.5 µm; <i>P</i> = .003), and milled group (66.2 µm; <i>P</i> = .012). Manufacturing method also affected occlusal adjustment (χ² = 13.904, <i>P</i> = .003) and intaglio adjustment (χ² = 28.624, <i>P</i> < .001). The milled group required more occlusal adjustment than the 0° group (<i>P</i> = .011), and greater intaglio adjustment than all DLP-printed groups (all <i>P</i> ≤ .004).</p><p><strong>Conclusion: </strong>Compared with milling, DLP-printed zirconia crowns demonstrated greater trueness (lower RMS) and required less chairside adjustment. Under the tested conditions, a 0° build angle was associated with the lowest trueness RMS and the least adjustment requirements.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"103-115"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136545/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative accuracy of complete-arch intraoral scans using full-scan and segmental-and-merge strategies.","authors":"Yoon-Jeong Shin, Kyu-Bok Lee, So-Yeun Kim, Cheong-Hee Lee","doi":"10.4047/jap.2026.18.2.116","DOIUrl":"10.4047/jap.2026.18.2.116","url":null,"abstract":"<p><strong>Purpose: </strong>Full-arch intraoral scanning often suffers from cumulative stitching errors. Segmental scanning using overlapping segments followed by digital merging has been proposed as a potential solution, but quantitative evidence remains limited. This study aimed to evaluate the accuracy of three intraoral scanning strategies-full-arch, 3-segment merging, and 5-segment merging-in both wired and wireless intraoral scanners (IOSs) using combined linear-distance and surface-based analyses.</p><p><strong>Materials and methods: </strong>A maxillary typodont with three 2-mm metallic reference spheres was scanned using two IOSs (Medit i700 and i700 Wireless). Each scanner acquired 10 full-arch, 3-segment, and 5-segment scans; segmental scans were merged in Exocad. Accuracy was assessed in Geomagic Control X as: (1) trueness and precision of three inter-sphere distances (right molar-incisor, left molar-incisor, inter-molar) and (2) global surface root-mean-square (RMS) deviation and the percentage of points within ± 100 µm. Group differences were analyzed using Kruskal-Wallis and Dwass-Steel-Critchlow-Fligner tests.</p><p><strong>Results: </strong>Across both IOSs, the 3-segment strategy consistently demonstrated the lowest linear deviation and variability, particularly for the inter-molar distance, while full-arch scans exhibited the greatest errors. Segmental scanning strategies resulted in significantly lower global RMS deviation and higher in-tolerance percentages than full-arch scans (RMS decreased from ~68 - 74 µm to 55 - 60 µm; in-tolerance increased from ~87 - 89% to > 93%). No significant differences in trueness, precision, RMS deviation, or in-tolerance percentage were observed between the wired and wireless scanners.</p><p><strong>Conclusion: </strong>Segmental-and-merge scanning strategy enhances the accuracy of complete-arch IOS acquisition and is unaffected by wired versus wireless data transmission.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"116-130"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136575/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147846026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of three post systems on the fracture resistance of teeth with extensive coronal structure loss and internal resorption.","authors":"Melis Oya Ateş, Esma Dinger, Kubra Degirmenci, Furkan Yılmaz, Dilaycan Uğureli","doi":"10.4047/jap.2026.18.2.70","DOIUrl":"10.4047/jap.2026.18.2.70","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to evaluate the effect of three different post systems on the fracture resistance of maxillary incisors with simulated internal root resorption and extensive coronal structure loss.</p><p><strong>Materials and methods: </strong>A total of 100 freshly extracted maxillary incisors were randomly divided into five groups (n = 20): glass fiber post, polyetheretherketone (PEEK) post, Ribbond post, positive control, and negative control. Internal resorption cavities were prepared 6 mm above the apex in each tooth, and the canals were filled using the single-cone technique with Sure-Seal Root bioceramic sealer. PEEK posts were digitally designed based on the dimensions of the glass fiber posts and fabricated in a dental laboratory. All posts were cemented using Panavia V5 resin cement according to the manufacturer's instructions. The specimens were tested under static loading at a 45° angle using a universal testing machine until fracture occurred. Data were analyzed using one-way ANOVA and Tamhane's post hoc test (<i>P</i> < .05).</p><p><strong>Results: </strong>The highest mean fracture resistance was observed in the negative control group (1559.4 ± 209.1 N), while the lowest was in the positive control group (492.9 ± 73.4 N). Among the post-applied groups, the PEEK post group exhibited a significantly higher fracture resistance (907.4 ± 104 N) compared to the others (<i>P</i> < .001).</p><p><strong>Conclusion: </strong>Although all post systems increased the fracture resistance, none reached the strength of intact teeth. PEEK posts yielded the highest fracture resistance under the present experimental conditions.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 2","pages":"70-79"},"PeriodicalIF":2.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13136571/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of scan body geometric configuration and library design on digital implant impression accuracy.","authors":"Hong Seok Moon, Ahreum Choi, Kyung Chul Oh, Minji Sun, Jaeyoung Kim","doi":"10.4047/jap.2026.18.1.55","DOIUrl":"10.4047/jap.2026.18.1.55","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this <i>in vitro</i> study was to evaluate how variations in scan body geometry, specifically body height and the length of the flat indexing surface (FIS), affect linear and angular accuracy when combined with truncated or full-geometry library files.</p><p><strong>Materials and methods: </strong>Nine scan body geometries were fabricated by combining three body heights (4, 5, and 6 mm) with three FIS lengths (1, 2, and 3 mm). Digital impressions were superimposed onto truncated or full-geometry library files. Linear deviation (ΔD) and angular deviation (ΔA) were calculated by comparing aligned scan bodies with coordinate measuring machine references. Linear and angular deviations were compared between library types using the Mann-Whitney U test, and differences among body heights and FIS lengths were evaluated using the Kruskal-Wallis test with Dunn's post-hoc test (α = .05).</p><p><strong>Results: </strong>Linear deviation remained within a comparable range, and most geometry-library comparisons did not show a significant difference from body height, FIS length, or library morphology (<i>P</i> > .05). Angular deviation demonstrated geometry-dependent behavior, increasing only in the 4-mm body paired with larger FIS lengths, particularly when full-geometry libraries were used. No significant angular differences were observed in the 5-mm or 6-mm body groups.</p><p><strong>Conclusion: </strong>Digital implant registration remained stable across most configurations. Shortened scan bodies performed reliably when FIS dimensions were preserved. Angular accuracy was more sensitive to geometry-library interactions, with truncated libraries improving stability.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"18 1","pages":"55-66"},"PeriodicalIF":2.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12956435/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147357690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}