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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 29, n. 4, p. 342-346, 2018-08-00.

Resumo

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)

• Processo FAPESP: 11/19150-7 - Sistemas CAD-CAM: avaliação da precisão de aquisição de dados e dos equipamentos de fresagem
• Beneficiário: Eduardo Piza Pellizzer
• Modalidade de apoio: Auxílio à Pesquisa - Regular