Ayad Mohamed F, Maghrabi Abdulhamaid A, Saif Ragab E, García-Godoy Franklin
College of Dentistry, University of Tanta, Egypt.
Am J Dent. 2011 Jun;24(3):176-82.
To characterize the surface roughness of human dentin prepared with different rotary instruments and its influence on the micro-tensile bond strength (microTBS) of self-etch adhesives.
Dentin surfaces were created from mid-coronal sound dentin in extracted, human third molars. The teeth were ground with high-speed diamond, tungsten carbide finishing, and cross-cut carbide rotary instruments. Morphological changes obtained were investigated with a surface texture analyzer. Two additional specimens from each group were treated and prepared for scanning electron microscopy. Resin composite (Z 100) was bonded to the surfaces using Optibond FL (control), Adper Prompt L-Pop (strong), Clearfil SE Bond (mild), or Clearfil S3 Bond (ultra-mild). Rectangular micro-specimens were prepared using the slow-speed diamond saw and tested in tensile to determine the microTBS. The data were analyzed with one-way analysis of variance and Tukey's HSD test (alpha= 0.05).
Surface preparation resulted in significant differences for surface topography and micro-tensile bond strength (P< 0.001). The cross-cut carbide burs had significantly higher mean roughness readings (SD) for all parameters: Ra [8.6 (1.9) microm], Rq [10.9 (2.2) microm], and Ry [41.1 (2.1) microm], except for the mean Rz [12.1 (3.1) microm] value, which was recorded for diamonds. The other roughness parameters for the diamond rotary instruments were intermediate. Dentin surfaces completed with tungsten carbide finishing burs produced a smoother surface Ra [1.2 (0.5) microm)] Rq ([1.6 (0.6) microm], Ry [6.4 (2.6) microm)] and Rz [1.9 (0.6) microm)]. The etch-and-rinse adhesive (OptiBond FL) yielded high micro-tensile values (58.1-68.3 MPa), irrespective of the rotary instruments used. The micro-tensile bond strength values were comparable for self-etch adhesives (Adper Prompt L-Pop, Clearfil SE Bond, Clearfil S3 Bond) irrespective of the burs used. The microTBS values were significantly higher with tungsten carbide finishing burs and smooth dentin surfaces.
表征使用不同旋转器械制备的人牙本质表面粗糙度及其对自酸蚀粘结剂微拉伸粘结强度（microTBS）的影响。
从拔除的人第三磨牙的牙冠中部健康牙本质制备牙本质表面。用高速金刚石、碳化钨精修和交叉切割碳化钨旋转器械对牙齿进行打磨。用表面纹理分析仪研究获得的形态变化。每组另外两个标本进行处理并制备用于扫描电子显微镜检查。使用Optibond FL（对照）、Adper Prompt L-Pop（强力）、Clearfil SE Bond（温和）或Clearfil S3 Bond（超温和）将树脂复合材料（Z 100）粘结到表面。使用低速金刚石锯制备矩形微标本并进行拉伸测试以确定microTBS。数据采用单因素方差分析和Tukey's HSD检验进行分析（α = 0.05）。
表面处理导致表面形貌和微拉伸粘结强度存在显著差异（P < 0.001）。除了金刚石记录的平均Rz [12.1（3.1）微米]值外，交叉切割碳化钨车针在所有参数上的平均粗糙度读数（标准差）显著更高：Ra [8.6（1.9）微米]、Rq [10.9（2.2）微米]和Ry [41.1（2.1）微米]。金刚石旋转器械的其他粗糙度参数处于中间水平。用碳化钨精修车针完成的牙本质表面产生更光滑的表面Ra [1.2（0.5）微米]、Rq [1.6（0.6）微米]、Ry [6.4（2.6）微米]和Rz [1.9（0.6）微米]。无论使用何种旋转器械，酸蚀冲洗粘结剂（OptiBond FL）都产生高微拉伸值（58.1 - 68.3 MPa）。无论使用何种车针，自酸蚀粘结剂（Adper Prompt L-Pop、Clearfil SE Bond、Clearfil S3 Bond）的微拉伸粘结强度值相当。使用碳化钨精修车针和光滑牙本质表面时，microTBS值显著更高。
