Soh G, Henderson L J, Chantler P
Department of Operative Dentistry, National University of Singapore.
Singapore Dent J. 1988 Dec;13(1):1-3.
Previous studies have shown that dentine adhesives reduce or eliminate contraction gaps in composite restorations. This study examined the relationship between cavity site and contraction gaps when two dentine adhesives were used in combination with two composites. One hundred and fifty-two cavities, each measuring 2.0 mm diameter and 1.5 mm depth, were prepared on side surfaces of extracted teeth, with each surface classified into three levels: upper, middle and lower. The dentine adhesives and composites were randomly assigned to the cavities. Four pre-determined, diametrical measurements of contraction gaps were made for each restored cavity using a Nikon Measurescope. Measurements yielded overall mean contraction gaps of 0.229, 0.262, and 0.260 for upper, middle and lower levels on the crown; the differences between means were not statistically significant. Type of dentine adhesives and composites influenced the size of contraction gaps rather than cavity site.
先前的研究表明，牙本质粘结剂可减少或消除复合树脂修复体中的收缩间隙。本研究探讨了两种牙本质粘结剂与两种复合树脂联合使用时，窝洞部位与收缩间隙之间的关系。在离体牙侧面制备了152个窝洞，每个窝洞直径2.0 mm，深度1.5 mm，每个表面分为上、中、下三个水平。将牙本质粘结剂和复合树脂随机分配到窝洞中。使用尼康测量显微镜对每个修复窝洞进行四次预定的收缩间隙直径测量。测量得出牙冠上、中、下水平的总体平均收缩间隙分别为0.229、0.262和0.260；平均值之间的差异无统计学意义。牙本质粘结剂和复合树脂的类型对收缩间隙大小的影响大于窝洞部位。
