Effect of Two Microshear Test Devices on Bond Strength and Fracture Pattern in Primary Teeth

Brazilian Dental Journal

Tamara Kerber Tedesco¹  Eugenio Jose Garcia¹  Fabio Zovico Maxnuck Soares¹  Rachel De Oliveira Rocha¹  Rosa Helena Miranda Grande¹ 

关键词: enamel;    dentin;    adhesive system;    microshear bond strength;    primary tooth;   

DOI  :  10.1590/0103-6440201302298

来源: SciELO

【 摘 要 】

This in vitro study evaluated the influence of two devices for application of shear load in microshear tests on bond strength and fracture pattern of primary enamel and dentin. Eighty primary molars were selected and flat enamel (40 teeth sectioned mesio-distally) and dentin (40 teeth sectioned transversally) surfaces were obtained. Both surfaces were polished to standardize the smear layer. Two-step etch-and-rinse adhesive systems (Adper Single Bond and XP Bond) were used. Polyethylene tubes was placed over the bonded surfaces and filled with composite resin. The microshear testing was performed after storage in water (24 h/37 °C) using two devices for application of microshear loads: a notched rod (Bisco Shear Bond Tester) or a knife edge (Kratos Industrial Equipment). Failure modes were evaluated using a stereomicroscope. Bond strength data were subjected to ANOVA and chi-square test to compare the failure mode distributions (α=0.05). No significant differences were observed between the groups for dentin and enamel bond strength or fracture patterns (p>0.05). The predominant failure mode was adhesive/mixed. In conclusion, the devices for application of shear loads did not influence the bond strength values, regardless of adhesive system and substrate.

【 授权许可】

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