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Effect of Resin Luting Film Thickness on Fracture Resistance of a Ceramic Cemented to Dentin
Author(s) -
Prakki Anuradha,
Cilli Renato,
Da Costa Alcides U.,
De Paiva Gonçalves Sergio E.,
Lia Mondelli Rafael F.,
Pereira Jose C.
Publication year - 2007
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2006.00168.x
Subject(s) - materials science , ceramic , dentin , composite material , fracture (geology) , cement , universal testing machine , dentistry , ultimate tensile strength , medicine
Purpose : The aim of this study was to evaluate the fracture resistance of ceramic plates cemented to dentin as a function of the resin cement film thickness.Materials and Methods : Ceramic plates (1 and 2 mm thicknesses) were cemented to bovine dentin using resin composite cement. The film thicknesses used were approximately 100, 200, and 300 μm. Noncemented ceramic plates were used as control. Fracture loads (N) were obtained by compressing a steel indenter in the center of the ceramic plates. ANOVA and Tukey tests (α= 0.05) were used for each ceramic thickness to compare fracture loads among resin cement films used.Results : Mean fracture load (N) for 1‐mm ceramic plates were: control—26 (7); 100 μm—743 (150); 200 μm—865 (105); 300 μm—982 (226). Test groups were significantly different from the control group; there was a statistical difference in fracture load between groups with 100 and 300 μm film thicknesses ( p < 0.01). Mean fracture load for 2‐mm ceramic plates were: control—214 (111); 100 μm—1096 (341); 200 μm—1067 (226); 300 μm—1351 (269). Tested groups were also significantly different from the control group ( p < 0.01). No statistical difference was shown among different film thicknesses.Conclusions : Unluted specimens presented significantly lower fracture resistance than luted specimens. Higher cement film thickness resulted in increased fracture resistance for the 1‐mm ceramic plates. Film thickness did not influence the fracture resistance of 2‐mm porcelain plates.