Assessment of Microtensile Bond Strength of Different Resin Cements Used for Luting of Indirect MOD Resin Composite Inlays to Dentin after Aging in Different Media

Document Type : Original Article


1 Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt

2 Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.

3 Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt


Purpose: To assess the microtensile bond strength (µTBS) of self-adhesive and self-etch resin cements used for luting indirect MOD resin composite inlays to dentin after aging in distilled water and lactic acid. Materials and Methods: Forty-eight sound human molars were selected, disinfected and a standardized Class II MOD cavity was prepared in each molar to be restored with indirect resin composite inlay restoration (SR Nexo, Ivoclar Vivadent AGSchaan, Liechtenstein). The molars were divided into three groups (n=16) according to the type of resin cement used for luting the restorations: total etch resin cement (All-Bond 2/Choice), self-etch resin cement (Panavia F2.0) and self-adhesive resin cement (Maxcem). According to the aging medium, every group was subdivided into two subgroups (n=8). Half of the specimens from each subgroup (n=4) were immersed in the aging medium for 24h while the other half for 168h. Specimens were sectioned to produce beams with a cross-sectional area of 1 mm2. Microtensile bond strength was evaluated using a universal testing machine and modes of bond failure were assessed using a stereomicroscope. Data was analyzed using a Three-Way analysis of variance (ANOVA) Test and Tukey’s post hoc multiple comparison test. Results: Panavia F2.0 specimens stored in distilled water for 24h revealed the highest µTBS values. While, All-Bond 2/Choice specimens stored for 168h in lactic acid showed the weakest values. Adhesive failure (at resin cement/dentin) was the predominant failure pattern. Conclusions: Resin cement type and aging media/time had a substantial effect on the microtensile bond strength at cement/dentin interface.


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