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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Misfit of pure titanium frameworks: Effect of veneer coverage and spark erosion process

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Author(s):
Nakaoka, Marcia Mika [1] ; Costa Nunez-Pantoja, Juliana Maria [1] ; Ferreira Koyama Takahashi, Jessica Mie [1] ; Xediek Consani, Rafael Leonardo [1] ; Mesquita, Marcelo Ferraz [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ACTA ODONTOLOGICA SCANDINAVICA; v. 69, n. 4, p. 238-242, JUL 2011.
Web of Science Citations: 5
Abstract

Objective. The purpose of this study was to evaluate the influence of veneer application on the misfit level of implant-supported frameworks. Materials and Methods. Thirty commercially pure titanium (Tritan, Dentaurum, Pforzheim, Germany) frameworks were fabricated from a metallic index containing five Branemark-type multi-unit abutments. Analogs of the abutments were positioned into the framework to manufacture an index for each framework, which permitted the evaluation of the marginal gap caused only by the veneer coverage. The frameworks were grouped (n = 10) in the following manner: (G1) heat-cured acrylic resin (Classico, Classico, Sao Paulo, Brazil); (G2) light-cured resin (Versyo.com, Heraeus Kulzer, Brazil); and (G3) porcelain (Triceram, Dentaurum, Pforzheim, Germany). Marginal refinement with spark erosion was then conducted. The marginal gap was verified before and after the veneer coverage and the spark erosion procedure, following the single screw test protocol (tightening force of 10 Ncm). Data were submitted to an analysis of variance (ANOVA) in a split-plot design for repeated measurements followed by a Tukey test (p = 0.05). Results. The veneer application was associated with a significant increase in the mean misfit values of all groups. The lowest values were presented by G2. After the spark erosion process, the mean misfit value decreased only on G3. Conclusions. Heat-cured acrylic resin and porcelain produced the highest values of marginal gaps, whereas light-cured acrylic resin produced the lowest. In addition, the spark erosion process was effective only in the marginal gap of the porcelain application group. (AU)