{"title":"采用铸造、选择性激光烧结、软密铣削等工艺制备的植入式钴铬棒的配合分析。","authors":"Elif Yiğit, Volkan Şahin","doi":"10.4047/jap.2025.17.4.210","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>This <i>in vitro</i> study evaluated the fit of implant-supported bars fabricated using different computer-aided manufacturing (CAM) techniques.</p><p><strong>Materials and methods: </strong>A mandibular model with four dental implants (Nobel Replace Conical Connection, 3.5 mm × 11.5 mm) was fabricated using photoelastic resin. Sixteen Co-Cr implant-supported bars were produced using four CAM techniques: casting milled wax (CMW), selective laser sintering (SLS), dense milling (DM), and soft milling (SM) (n = 4). Fit was assessed through photoelastic stress analysis and digital scanning with a topographic digitizer (BreuckmannSmartScan). A standardized coordinate system was used for fit analysis. Data were analyzed using the Kruskal-Wallis test, with Dunn-Bonferroni for multiple comparisons (α = .05).</p><p><strong>Results: </strong>Photoelastic analysis showed that bars fabricated with DM exhibited the lowest stress levels, while SM showed moderate stress. Fit was significantly influenced by Δy-z, Δd<sub>in</sub>, and Δd<sub>out</sub> (<i>P</i> < .01), whereas Δhex and Δx-z had no significant effect (<i>P</i> > .05). The highest mean Δy-z value was observed in CMW (0.68 ± 0.28°) and the lowest in SLS (0.01 ± 0.34°). CMW had the highest Δd<sub>in</sub> (-160.44 ± 61.17 µm) and DM the lowest (-5.46 ± 11.80 µm). DM showed the highest Δd<sub>out</sub> (46.23 ± 39.32 µm), while SM had the lowest (-55.04 ± 35.06 µm), with significant differences among the techniques.</p><p><strong>Conclusion: </strong>In conclusion, full-arch implant supported Co-Cr bars fabricated using the different CAM techniques exhibited clinically acceptable passive fit.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"17 4","pages":"210-223"},"PeriodicalIF":2.5000,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12411299/pdf/","citationCount":"0","resultStr":"{\"title\":\"Fit analysis of implant-supported Co-Cr bars fabricated using casting, selective laser sintering, soft and dense milling techniques.\",\"authors\":\"Elif Yiğit, Volkan Şahin\",\"doi\":\"10.4047/jap.2025.17.4.210\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>This <i>in vitro</i> study evaluated the fit of implant-supported bars fabricated using different computer-aided manufacturing (CAM) techniques.</p><p><strong>Materials and methods: </strong>A mandibular model with four dental implants (Nobel Replace Conical Connection, 3.5 mm × 11.5 mm) was fabricated using photoelastic resin. Sixteen Co-Cr implant-supported bars were produced using four CAM techniques: casting milled wax (CMW), selective laser sintering (SLS), dense milling (DM), and soft milling (SM) (n = 4). Fit was assessed through photoelastic stress analysis and digital scanning with a topographic digitizer (BreuckmannSmartScan). A standardized coordinate system was used for fit analysis. Data were analyzed using the Kruskal-Wallis test, with Dunn-Bonferroni for multiple comparisons (α = .05).</p><p><strong>Results: </strong>Photoelastic analysis showed that bars fabricated with DM exhibited the lowest stress levels, while SM showed moderate stress. Fit was significantly influenced by Δy-z, Δd<sub>in</sub>, and Δd<sub>out</sub> (<i>P</i> < .01), whereas Δhex and Δx-z had no significant effect (<i>P</i> > .05). The highest mean Δy-z value was observed in CMW (0.68 ± 0.28°) and the lowest in SLS (0.01 ± 0.34°). CMW had the highest Δd<sub>in</sub> (-160.44 ± 61.17 µm) and DM the lowest (-5.46 ± 11.80 µm). DM showed the highest Δd<sub>out</sub> (46.23 ± 39.32 µm), while SM had the lowest (-55.04 ± 35.06 µm), with significant differences among the techniques.</p><p><strong>Conclusion: </strong>In conclusion, full-arch implant supported Co-Cr bars fabricated using the different CAM techniques exhibited clinically acceptable passive fit.</p>\",\"PeriodicalId\":51291,\"journal\":{\"name\":\"Journal of Advanced Prosthodontics\",\"volume\":\"17 4\",\"pages\":\"210-223\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12411299/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Advanced Prosthodontics\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.4047/jap.2025.17.4.210\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/8/19 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"DENTISTRY, ORAL SURGERY & MEDICINE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Advanced Prosthodontics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.4047/jap.2025.17.4.210","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/8/19 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
Fit analysis of implant-supported Co-Cr bars fabricated using casting, selective laser sintering, soft and dense milling techniques.
Purpose: This in vitro study evaluated the fit of implant-supported bars fabricated using different computer-aided manufacturing (CAM) techniques.
Materials and methods: A mandibular model with four dental implants (Nobel Replace Conical Connection, 3.5 mm × 11.5 mm) was fabricated using photoelastic resin. Sixteen Co-Cr implant-supported bars were produced using four CAM techniques: casting milled wax (CMW), selective laser sintering (SLS), dense milling (DM), and soft milling (SM) (n = 4). Fit was assessed through photoelastic stress analysis and digital scanning with a topographic digitizer (BreuckmannSmartScan). A standardized coordinate system was used for fit analysis. Data were analyzed using the Kruskal-Wallis test, with Dunn-Bonferroni for multiple comparisons (α = .05).
Results: Photoelastic analysis showed that bars fabricated with DM exhibited the lowest stress levels, while SM showed moderate stress. Fit was significantly influenced by Δy-z, Δdin, and Δdout (P < .01), whereas Δhex and Δx-z had no significant effect (P > .05). The highest mean Δy-z value was observed in CMW (0.68 ± 0.28°) and the lowest in SLS (0.01 ± 0.34°). CMW had the highest Δdin (-160.44 ± 61.17 µm) and DM the lowest (-5.46 ± 11.80 µm). DM showed the highest Δdout (46.23 ± 39.32 µm), while SM had the lowest (-55.04 ± 35.06 µm), with significant differences among the techniques.
Conclusion: In conclusion, full-arch implant supported Co-Cr bars fabricated using the different CAM techniques exhibited clinically acceptable passive fit.
期刊介绍：
This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics.
This journal publishes
• Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants.
• Review articles by experts on controversies and new developments in prosthodontics.
• Case reports if they provide or document new fundamental knowledge.
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