Abstract
This in vitro study aimed to evaluate the effect of flowable composite resin as a restorative material on regional tensile bond strength to cervical wedge shaped cavity walls. Wedge-shaped cavities were prepared in the buccal cervical dentin of eighteen extracted intact human molars. The teeth were divided into two groups according to the adhesive systems used (Clearfil Mega Bond, MB, (Kuraray), or One-up Bond F, OB, (Tokuyama)). After the application of the adhesive systems, the teeth were further subdivided into two groups, and the cavities were restored with a flowable resin composite (the flowable group, Palfique Estelite LV High Flow, Tokuyama) or a hybrid resin composite (the hybrid group, Palfique Estelite, Tokuyama). After 24h in water at room temperature, the teeth were serially sliced and alternately trimmed (0.7?-1.4mm) to test either the occlusal or gingival walls of the each bonded restoration, and micro-tensile bond strengths (μTBS) were determined. The data were analyzed by one-way and three-way ANOVA, and Fisher's PLSD test (p<0.05). For both adhesive systems, and both sides of the cavity walls, μTBS of the flowable group was higher than the hybrid group. Flowable resin composite used in this study could be recommended as the adequate restorative material for improved bonding to the wedge shaped cavity.
