de Souza-Zaroni Wanessa Christine, Delfino Carina Sinclér, Ciccone-Nogueira Juliane Cristina, Palma-Dibb Regina Guenka, Corona Silmara Aparecida Milori
Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Av. do Café, S/N Monte Alegre, Cep, 14040-904 Ribeirao Preto, SP, Brazil.
J Mater Sci Mater Med. 2007 Oct;18(10):2003-9. doi: 10.1007/s10856-007-3121-7. Epub 2007 Jun 9.
This study evaluated the effect of cavity preparation using air abrasion or carbide bur on bond strength to enamel treated with a self-etching primer (Tyrian SPE) or a phosphoric acid etchant. Twenty-four molars were divided into three groups: high-speed; standard handpiece (ST air abrasion) or supersonic handpiece (SP air abrasion) of the same air-abrasive system. The enamel surfaces were treated with one of the two etchants and the same adhesive agent One Step Plus, and then composite buildups were done with Filtek Z250. After 24 h at 37 degrees C, beams (0.8 mm2) were obtained and subjected to tensile stress in a universal testing machine (0.5 mm/min). The data were submitted to analysis of variance and Tukey's test (P < 0.05). For the conditioning agents, it was observed that the specimens conditioned with phosphoric acid presented superior results than the specimens that used Tyrian SPE. For the preparation techniques, it was verified that the SP air abrasion groups showed the highest bond strengths and carbide-bur groups presented the lowest bond strengths when the specimens were conditioned with Tyrian SPE. It can be concluded that the influence of the cavity preparation method was dependent on the conditioning system used, only when using carbide-bur preparation technique.
本研究评估了使用空气磨蚀或硬质合金车针进行窝洞预备对经自酸蚀底漆（Tyrian SPE）或磷酸酸蚀剂处理的牙釉质粘结强度的影响。将24颗磨牙分为三组：高速组；同一空气磨蚀系统的标准手机（ST空气磨蚀）或超声手机（SP空气磨蚀）组。牙釉质表面用两种酸蚀剂之一和相同的粘结剂One Step Plus处理，然后用Filtek Z250进行复合树脂修复。在37℃下放置24小时后，制备出梁（0.8平方毫米）并在万能试验机上施加拉伸应力（0.5毫米/分钟）。数据进行方差分析和Tukey检验（P<0.05）。对于酸蚀剂，观察到用磷酸处理的标本比使用Tyrian SPE的标本表现出更好的结果。对于预备技术，验证了当标本用Tyrian SPE处理时，SP空气磨蚀组显示出最高的粘结强度，而硬质合金车针组的粘结强度最低。可以得出结论，窝洞预备方法的影响仅在使用硬质合金车针预备技术时取决于所使用的酸蚀系统。
