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http://hdl.handle.net/1843/45437| Type: | Artigo de Periódico |
| Title: | Marginal fit and photoelastic stress analysis of cad-cam and overcast 3-unit implant-supported frameworks |
| Authors: | Anna Gabriella Camacho Presotto Cláudia Lopes Brilhante Bhering Marcelo Ferraz Mesquita Valentim Adelino Ricardo Barão |
| Abstract: | Statement of problem: Several studies have shown the superiority of computer-assisted design and computer-assisted manufacturing (CAD-CAM) technology compared with conventional casting. However, an advanced technology exists for casting procedures (the overcasting technique), which may serve as an acceptable and affordable alternative to CAD-CAM technology for fabricating 3-unit implant-supported fixed dental prostheses (FDPs). Purpose: The purpose of this in vitro study was to evaluate, using quantitative photoelastic analysis, the effect of the prosthetic framework fabrication method (CAD-CAM and overcasting) on the marginal fit and stress transmitted to implants. The correlation between marginal fit and stress was also investigated. Material and methods: Three-unit implant-supported FDP frameworks were made using the CAD-CAM (n=10) and overcasting (n=10) methods. The frameworks were waxed to simulate a mandibular first premolar (PM region) to first molar (M region) FDP using overcast mini-abutment cylinders. The wax patterns were overcast (overcast experimental group) or scanned to obtain the frameworks (CAD-CAM control group). All frameworks were fabricated from cobalt-chromium (CoCr) alloy. The marginal fit was analyzed according to the single-screw test protocol, obtaining an average value for each region (M and PM) and each framework. The frameworks were tightened for the photoelastic model with standardized 10-Ncm torque. Stress was measured by quantitative photoelastic analysis. The results were submitted to the Student t test, 2-way ANOVA, and Pearson correlation test (α=.05). Results: The framework fabrication method (FM) and evaluation site (ES; M and PM regions) did not affect the marginal fit values (P=.559 for FM and P=.065 for ES) and stress (P=.685 for FM and P=.468 for ES) in the implant-supported system. Positive correlations between marginal fit and stress were observed (CAD-CAM: r=0.922; P<.001; overcast: r=0.908; P<.001). Conclusions: CAD-CAM and overcasting methods present similar marginal fit and stress values for 3-unit FDP frameworks. The decreased marginal fit of frameworks induces greater stress in the implant-supported system. |
| Subject: | Dental implants Dental prosthesis |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | FAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | 10.1016/j.prosdent.2016.06.011 |
| URI: | http://hdl.handle.net/1843/45437 |
| Issue Date: | 22-Sep-2016 |
| metadata.dc.url.externa: | https://www.thejpd.org/article/S0022-3913(16)30279-7/fulltext#relatedArticles |
| metadata.dc.relation.ispartof: | The journal of Prosthetic Dentistry |
| Appears in Collections: | Artigo de Periódico |
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