He Zhengdi, Shimada Yasushi, Sadr Alireza, Ikeda Masaomi, Tagami Junji
Department of Restorative Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
J Adhes Dent. 2008 Dec;10(6):447-53.
The effects of incremental filling technique and flowable liner on the bond strength of resin composite in different sized cavities were investigated in this study.
Two sizes of cylindrical Class I cavities were prepared in bovine dentin (98.1 mm3 and 21.2 mm3). A light-curing resin composite (Clearfil Photocore) with a self-etching primer adhesive (Clearfil SE Bond) was used to bulk fill the cavities (C-factor 5), with and without flowable liner (Clearfil FLOW-FX) or incremental filling (2 layers, C-factor 3). As control, a 3-mm or 5-mm buildup was placed on the flat dentin surface (C-factor 0.2). After 24 h storage in 37 degrees C water, the microtensile bond strength was measured at a crosshead speed of 1 mm/min. Mode of failure in the fractured specimens was observed using a scanning electron microscope. The obtained results were statistically analyzed.
In large cavities, incrementally filled and lined cavities showed higher bond strength values than the bulk-filled subgroup (p < 0.05). However, in small cavities, neither the incremental technique nor flowable liner improved the bond strength.
Not only the filling techniques but also the cavity size affected the bond strength to the cavity floor in cylindrical Class I cavities.
本研究调查了增量填充技术和可流动衬层对不同尺寸窝洞树脂复合材料粘结强度的影响。
在牛牙本质中制备两种尺寸的I类圆柱形窝洞（98.1立方毫米和21.2立方毫米）。使用带有自酸蚀底漆粘结剂（Clearfil SE Bond）的光固化树脂复合材料（Clearfil Photocore）对窝洞进行整体填充（C因子为5），有或没有可流动衬层（Clearfil FLOW-FX）或增量填充（2层，C因子为3）。作为对照，在平坦的牙本质表面放置3毫米或5毫米的堆积物（C因子为0.2）。在37℃水中储存24小时后，以1毫米/分钟的十字头速度测量微拉伸粘结强度。使用扫描电子显微镜观察断裂试件的断裂模式。对所得结果进行统计学分析。
在大窝洞中，增量填充和衬层处理的窝洞显示出比整体填充亚组更高的粘结强度值（p < 0.05）。然而，在小窝洞中，增量技术和可流动衬层均未提高粘结强度。
不仅填充技术，而且窝洞尺寸都会影响I类圆柱形窝洞与窝洞底部的粘结强度。
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