Vertical and horizontal misfit analysis of 3-unit FDP fabricated with different techniques and CAD/CAM systems
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Data
2018-07-01
Autores
Pellizzer, Eduardo Piza [UNESP]
de Mello, Caroline Cantieri [UNESP]
Gomes, Jéssica Marcela de Luna [UNESP]
Santiago Júnior, Joel Ferreira
Lemos, Cleidiel Aparecido Araújo [UNESP]
Verri, Fellippo Ramos [UNESP]
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Resumo
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.
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Palavras-chave
CAD/CAM, Dental soldering, Marginal adaptation, Misfit, Welding
Como citar
Brazilian Dental Journal, v. 29, n. 4, p. 342-346, 2018.