Gamborgi Giovana Portella, Loguercio Alessandro D, Reis Alessandra
Department of Dental Materials and Operative Dentistry, School of Dentistry, University of Oeste de Santa Catarina, Joaçaba, SC, Brazil.
J Dent. 2007 May;35(5):371-6. doi: 10.1016/j.jdent.2006.11.005. Epub 2006 Dec 28.
To evaluate the influence of enamel border on regional resin-dentin microtensile bond strength (muTBS) over time.
Thirty human third molars had a flat dentine surface exposed. Two adhesive systems (Single Bond [SB] and ScotchBond Multi Purpose Plus [SBMP]) were applied and composite resin crowns (Filtek Z250) were constructed. Teeth were divided into three groups (n=5). Group A, specimens were sectioned to obtain sticks to be tested in tension (0.5mm/min) immediately. Group B specimens were stored without outer enamel in water for 6 months, before sectioning and testing. Group C, specimens were stored with outer enamel in water for 6 months, before sectioning and testing. In all groups, the origin of the sticks, periphery and inner regions was controlled. The data for each adhesive were subjected to a two-way repeated measure ANOVA (location versus storage conditions) and Tukey's test.
No significant degradation in muTBS was observed for SBMU in all conditions. For SB, a significant reduction on muTBS was observed in the specimens without enamel border (group B). The degradation was more pronounced in the specimens from the periphery.
The three-step etch-and-rinse system is less susceptible to water degradation effects; stable resin-dentin bonds can be achieved with two-step etch-and-rinse systems as long as there is a bonded enamel border.
评估釉质边缘对区域树脂-牙本质微拉伸粘结强度（μTBS）随时间的影响。
30颗人第三磨牙暴露平坦的牙本质表面。应用两种粘结系统（单组分粘结剂[SB]和多功能增强型3M ScotchBond粘结剂[SBMP]）并制作复合树脂全冠（Filtek Z250）。牙齿分为三组（n = 5）。A组，将标本切片以获得立即进行拉伸测试（0.5mm/分钟）的棒材。B组标本在切片和测试前，在水中无外层釉质保存6个月。C组，标本在切片和测试前，在水中有外层釉质保存6个月。在所有组中，控制棒材的来源、周边和内部区域。对每种粘结剂的数据进行双向重复测量方差分析（位置与保存条件）和Tukey检验。
在所有条件下，未观察到SBMP的μTBS有显著降解。对于SB，在没有釉质边缘的标本（B组）中观察到μTBS显著降低。周边标本的降解更明显。
三步酸蚀冲洗系统对水降解作用的敏感性较低；只要有粘结的釉质边缘，两步酸蚀冲洗系统就能实现稳定的树脂-牙本质粘结。
