Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium.
Dent Mater J. 2011;30(1):7-13. doi: 10.4012/dmj.2010-085. Epub 2011 Jan 26.
Dentin is a variable substrate with properties that change considerable in a single surface. The purpose of this study was to evaluate the bonding effectiveness to these different dentin locations and evaluate these differences over time. After bonding procedures with five different adhesives, small micro-tensile bond strength (µTBS) beams were prepared and dichotomously divided in 'center' and 'periphery' dentin specimens. After 1 week, 3, 6 and 12 months of water storage the µTBS of specimens of each group was determined, enabling a paired study design. The bond strengths of both etch&rinse adhesives were insensitive to regional variability. For the two-step self-etch adhesives, a marked increase in bond strengths was observed with increasing amount of intertubular dentin. Regional variability did not affect the long-term bonding effectiveness for any of the adhesives tested. In conclusion, only for the mild self-etch adhesives, µTBS to 'periphery' dentin was higher than for the 'center' specimens.
牙本质是一种性质多变的底物，其特性在单个表面上会发生很大变化。本研究的目的是评估对这些不同牙本质部位的粘结效果，并随时间评估这些差异。在使用五种不同的粘结剂进行粘结程序后，制备了小型微拉伸粘结强度（µTBS）梁，并将其二分法分为“中心”和“周围”牙本质标本。在 1 周、3 个月、6 个月和 12 个月的水储存后，确定每组标本的 µTBS，从而实现配对研究设计。两种酸蚀-冲洗粘结剂的粘结强度对区域性变化不敏感。对于两步自酸蚀粘结剂，随着管间牙本质含量的增加，粘结强度明显增加。对于测试的任何一种粘结剂，区域性变化都不会影响长期粘结效果。总之，只有轻度自酸蚀粘结剂的“周围”牙本质的 µTBS 高于“中心”标本。
