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BALESTRIN, EA. Dentin: Relationship between tubular density at different depths and the shear strength of four different adhesive systems. 2009. 161p. Thesis – School of Dentistry of Ribeirão Preto, São Paulo University, Ribeirão Preto. Dentin at various depths presents different tubular density and permeability, thus directly affecting the adhesion of bonding systems. Aim: to evaluate the relationship between tubular density and shear strength of four bonding systems at different dentin depths. Material and methods: upper and lower human molars were analyzed regarding dentin tubular density at different depths by scanning electron microscopy, as well as shear strength (ISO TR 11405 method) for the dependent variables depth (surface dentin, 0.5, 1.0, 1.5 and 2.0 mm), bonding system (total etch and self-etching) and tooth aspect (buccal or palatal/lingual). The bonding systems Single Bond Adper, Xeno III, Clearfil SE Bond e Adper Prompt L-Pop were selected. The analysis were performed in a sampledependent way and results were submitted to the ANOVA test. Results: scanning electron microscopy revealed an increase in tubular density accompanying the depth. Shear strength tests showed that upper molars present significant differences for the factors depth and bonding system, as well as for the interactions depth x bonding system, aspect x depth and aspect x bonding system. Lower molars revealed significance for the three dependent variables and for the interactions depth x bonding system and aspect x bonding system. The Xeno III bonding system presented average values higher than the other products, both in upper and lower molars, in deep dentin (1.0, 1.5 and 2.0), in a regular way. Conclusions: In general, as the dentinal depth increases, so does the tubular density. In human molars, the dependent variables dentin depth and bonding system influenced the shear strength. The self-etching bonding system Xeno III revealed potential maintenance of shear strength when used in dentin at different depths. As dentin depth increases, so does the tubular density, thus lowering shear strength; however, this relationship is dependent on the bonding system used.

Dentina: relação entre densidade tubular em diferentes profundidades e a resistência ao cisalhamento de quatro diferentes sistemas adesivos