The influence of blade type and feeding force during resin bonded dentin specimen preparation on the microtensile bond strength test

• Main Authors: Apinya Limvisitsakul, Suppason Thitthaweerat, Pisol Senawongse
• Other Authors: Mahidol University, Faculty of Dentistry
• Format: Article
• Published: 2022
• Subjects: Engineering
• Online Access: https://repository.li.mahidol.ac.th/handle/123456789/76985
• Institution: Mahidol University

This paper presents the effect of blade type and feeding force during resin-bonded dentin specimen preparation on the microtensile bond strength (µTBS) test. Forty resin-bonded flat middle dentin specimens were divided into four groups. The specimens of each group were sectioned according to type of blade and feeding force as follows: fine grit/20 N, fine grit/40 N, medium grit/20 N, and medium grit/40 N to obtain resin-dentin sticks with a cross-sectional area of 1.0 mm2 . Four sticks from the center of each tooth were subjected to the µTBS test. Five remaining sticks of each group were selected for surface topography observation under a scanning electron microscope (SEM). As a result, the bond strength of the medium-grit group was higher than that of the fine-grit group (p < 0.001), whereas the feeding force had no influence on bond strength values (p = 0.648). From the SEM, sticks prepared with the fine-grit blade showed a smoother surface integrity and fewer defects on the specimen edges in comparison with the sticks prepared with the medium-grit blade. The grit type of the blade is one of the considerable factors that may affect the bond strength and the surface integrity of resin-dentin specimens for microtensile testing.