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. 2017 Apr;9(2):110-117.
doi: 10.4047/jap.2017.9.2.110. Epub 2017 Apr 6.

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

Roodabeh Koodaryan  1 , Ali Hafezeqoran  1 , Amin Khakpour Maleki  2
Affiliations

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

Roodabeh Koodaryan et al. J Adv Prosthodont. 2017 Apr.

Abstract

Purpose: This laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis.

Materials and methods: 4 × 4 flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames (4 × 4 × 1.5 mm) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0.5 mm/min. Debonded specimens were randomly allocated into 2 subgroups (n = 13) according to the dentin cleaning procedures for recementation. The residual cement on bonded dentin surfaces was eliminated with either pumice slurry (p) or tungsten carbide bur (c). The restorations were rebonded with the same cement and were subjected to shear test. Data failed the normality test (P < .05), thus were analyzed with Mann Whitney U-test, Wilcoxon signed rank test, and two-way ANOVA after logarithmic transformation (α = .05).

Results: The initial shear bond strength of group P was significantly higher than group U (P = .001). Pc and Uc groups presented higher bond strength after recementation compared to the initial bond strength. However, it was significant only in Pc group (P = .034).

Conclusion: The specimens recemented with Panavia F2.0 provided higher bond strength than RelyX Ultimate cement. Moreover, a tungsten carbide bur was a more efficient method in removing the residual resin cement and increased the bond strength of Panavia F2.0 cement after recementation.

Keywords: Dentin surface cleaning; Resin bonded restorations; Resin cement; Shear bond strength.

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Figures

Fig. 1
Fig. 1. Schematic diagram of the study design.
Fig. 2
Fig. 2. Frequency of failure patterns after initial debonding in groups P and U (A) and after second debonding in groups Pp, Pc, Up and Uc (B).
Fig. 3
Fig. 3. Images of SEM (×2000) after cleaning the surface with pumice and tungsten carbide bur; Pp (A), Pc (B), Up (C), and Uc (D).
See this image and copyright information in PMC

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