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

Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

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Author(s):
Eduardo Piza Pellizzer1 [1] ; Caroline Cantieri de Mello [2] ; Jéssica Marcela de Luna Gomes [3] ; Joel Ferreira Santiago Júnior [4] ; Cleidiel Aparecido Araújo Lemos [5] ; Fellippo Ramos Verri [6]
Total Authors: 6
Affiliation:
[1] Universidade Estadual Paulista. Department of Dental Materials and Prosthodontics, Araçatuba Dental School - Brasil
[2] Universidade Estadual Paulista. Department of Dental Materials and Prosthodontics, Araçatuba Dental School - Brasil
[3] Universidade Estadual Paulista. Department of Dental Materials and Prosthodontics, Araçatuba Dental School - Brasil
[4] Universidade do Sagrado Coração. Pró-Reitoria de Pesquisa e Pós-graduação - Brasil
[5] Universidade Estadual Paulista. Department of Dental Materials and Prosthodontics, Araçatuba Dental School - Brasil
[6] Universidade Estadual Paulista. Department of Dental Materials and Prosthodontics, Araçatuba Dental School - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Brazilian Dental Journal; v. 29, n. 4, p. 342-346, 2018-08-00.
Abstract

Abstract The aim of this is was evaluate the vertical and horizontal marginal adaptation of 3-unit fixed partial denture frameworks fabricated using different techniques and CAD/CAM systems. A total of 40 framework specimens were fabricated and divided into four groups as follows: lost-wax casting (G1); lost-wax casting with welding (G2); extraoral optical scanning of models (3S/DWOS) (G3); intraoral optical scanning (Cerec Bluecam/Sirona) (G4). A reference model was used to simulate a fixed partial denture with three elements (with a central pontic). The frameworks of G1 and G2 were cast in nickel-chromium (NiCr) alloy, whereas those of G3 and G4 were milled in zirconia. In all groups, vertical and horizontal marginal adaptation (over-contour and under-contour) was evaluated using a three-dimensional optical microscope (Quick Scope, Mitutoyo). The results showed higher vertical marginal misfit in G1 than in the other groups (p<0.001). Regarding horizontal marginal misfit, higher over-contour values occurred in G3 than in the other groups (p<0.001). G3 did not show under-contour at all, whereas the other groups did not differ from each other in this regard (p>0.05). Within the limitations of this study, it can be concluded that lost-wax casting with welding is a viable alternative to the use of CAD/CAM systems to fabricate frameworks of three-unit FPDs, since the techniques yielded similar vertical misfit values. Extra-oral CAD/CAM systems showed the highest horizontal misfit (over-contour) compared to other groups. (AU)

FAPESP's process: 11/19150-7 - CAD-CAM systems: precision evaluation of data acquisition and milling equipment
Grantee:Eduardo Piza Pellizzer
Support Opportunities: Regular Research Grants