Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks
The introduction of new digital technologies represents an important advance to fabricate metal–ceramic restorations. However, few studies have evaluated the influence of these technologies on the fit of the restorations. The aim of this study was to evaluate the effect of different manufacturing te...
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MDPI AG
2021-03-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/7/2988 |
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| author | Celia Tobar Verónica Rodríguez Carlos Lopez-Suarez Jesús Peláez Jorge Cortés-Bretón Brinckmann María J. Suárez |
| author_facet | Celia Tobar Verónica Rodríguez Carlos Lopez-Suarez Jesús Peláez Jorge Cortés-Bretón Brinckmann María J. Suárez |
| author_sort | Celia Tobar |
| collection | DOAJ |
| description | The introduction of new digital technologies represents an important advance to fabricate metal–ceramic restorations. However, few studies have evaluated the influence of these technologies on the fit of the restorations. The aim of this study was to evaluate the effect of different manufacturing techniques and pontic design on the vertical marginal fit of cobalt–-chromium (Co–Cr) posterior fixed partial dentures (FPDs) frameworks. Methods: Eighty stainless-steel dies were prepared to receive 3-unit FPDs frameworks with intermediate pontic (n = 40) and cantilever pontic (n = 40). Within each design, the specimens were randomly divided into four groups (n = 10 each) depending on the manufacturing technique: casting (CM), direct metal laser sintering (LS), soft metal milling (SM), and hard metal milling (HM). The frameworks were luted, and the vertical marginal discrepancy was assessed. Data analysis was made using Kruskal–Wallis and Mann–Whitney U tests (α = 0.05). Results: The vertical marginal discrepancy values of all FPDs were below 50 μm. The HM frameworks obtained the lowest misfit values in both designs. However, no differences were found among intermediate pontic groups or cantilevered groups. Likewise, when differences in a marginal discrepancy between both framework designs were analyzed, no differences were observed. Conclusions: The analyzed digital technologies demonstrated high precision of fit on Co–Cr frameworks and on both pontic designs. |
| first_indexed | 2024-03-10T12:52:28Z |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T12:52:28Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-b14360e0529048fcab7f7bb9137352ff2023-11-21T12:58:59ZengMDPI AGApplied Sciences2076-34172021-03-01117298810.3390/app11072988Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures FrameworksCelia Tobar0Verónica Rodríguez1Carlos Lopez-Suarez2Jesús Peláez3Jorge Cortés-Bretón Brinckmann4María J. Suárez5Department of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainDepartment of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainDepartment of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainDepartment of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainDepartment of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainDepartment of Conservative Dentristy and Bucofacial Prosthesis, Faculty of Odontology, University Complutense of Madrid, 28040 Madrid, SpainThe introduction of new digital technologies represents an important advance to fabricate metal–ceramic restorations. However, few studies have evaluated the influence of these technologies on the fit of the restorations. The aim of this study was to evaluate the effect of different manufacturing techniques and pontic design on the vertical marginal fit of cobalt–-chromium (Co–Cr) posterior fixed partial dentures (FPDs) frameworks. Methods: Eighty stainless-steel dies were prepared to receive 3-unit FPDs frameworks with intermediate pontic (n = 40) and cantilever pontic (n = 40). Within each design, the specimens were randomly divided into four groups (n = 10 each) depending on the manufacturing technique: casting (CM), direct metal laser sintering (LS), soft metal milling (SM), and hard metal milling (HM). The frameworks were luted, and the vertical marginal discrepancy was assessed. Data analysis was made using Kruskal–Wallis and Mann–Whitney U tests (α = 0.05). Results: The vertical marginal discrepancy values of all FPDs were below 50 μm. The HM frameworks obtained the lowest misfit values in both designs. However, no differences were found among intermediate pontic groups or cantilevered groups. Likewise, when differences in a marginal discrepancy between both framework designs were analyzed, no differences were observed. Conclusions: The analyzed digital technologies demonstrated high precision of fit on Co–Cr frameworks and on both pontic designs.https://www.mdpi.com/2076-3417/11/7/2988marginal adaptationfixed partial denturedental technologycobalt–chromium alloysscanning electron microscopy |
| spellingShingle | Celia Tobar Verónica Rodríguez Carlos Lopez-Suarez Jesús Peláez Jorge Cortés-Bretón Brinckmann María J. Suárez Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks Applied Sciences marginal adaptation fixed partial denture dental technology cobalt–chromium alloys scanning electron microscopy |
| title | Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks |
| title_full | Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks |
| title_fullStr | Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks |
| title_full_unstemmed | Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks |
| title_short | Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks |
| title_sort | effect of digital technologies on the marginal accuracy of conventional and cantilever co cr posterior fixed partial dentures frameworks |
| topic | marginal adaptation fixed partial denture dental technology cobalt–chromium alloys scanning electron microscopy |
| url | https://www.mdpi.com/2076-3417/11/7/2988 |
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