Jung M
University of Giessen, Dental School, Department of Operative Dentistry and Endodontics, Germany.
Oper Dent. 1997 May-Jun;22(3):98-104.
Trimming composite restorations includes gross removal of excess material, contouring, and finishing. Many surfaces such as the lingual surface of anterior teeth or the occlusal surfaces of posterior teeth require the use of rigid rotating instruments. The purpose of our study was to assess the suitability of eight finishing diamonds, five tungsten carbide finishing burs, and one ceramically coated finishing instrument for trimming a small-particle hybrid composite material. A total of 70 specimens of Herculite XRV were treated with the different finishing instruments under simulated practice conditions, and surface roughness was recorded quantitatively using an optical laser pick-up. The resulting surfaces were examined qualitatively with the help of scanning electron microscopy (SEM). Cutting efficiency of the diamonds and burs was evaluated at a constant pressure of 2.5 N using 42 additional specimens of Herculite XRV. Significant differences were calculated using one-way ANOVA and pairwise contrasts by Tukey's multiple range test. The results showed that finishing diamonds were characterized by high cutting efficiency and relatively rough corresponding composite surfaces, whereas tungsten carbide finishing burs led to smooth composite surfaces but had little cutting efficiency. For gross removal and contouring of composite restorations, a 15-40 microns finishing diamond is recommended followed by a tungsten carbide bur for finishing the restoration.
修整复合树脂修复体包括大量去除多余材料、塑形和抛光。许多表面，如前牙舌面或后牙咬合面，需要使用刚性旋转器械。我们研究的目的是评估八种抛光金刚砂钻、五种碳化钨抛光车针和一种陶瓷涂层抛光器械对修整一种小颗粒混合复合树脂材料的适用性。在模拟实际操作条件下，使用不同的抛光器械对总共70个Herculite XRV标本进行处理，并使用光学激光传感器定量记录表面粗糙度。借助扫描电子显微镜（SEM）对所得表面进行定性检查。使用另外42个Herculite XRV标本，在2.5 N的恒定压力下评估金刚砂钻和车针的切割效率。使用单因素方差分析和Tukey多重范围检验进行两两对比计算显著差异。结果表明，抛光金刚砂钻的特点是切割效率高，相应的复合树脂表面相对粗糙，而碳化钨抛光车针则使复合树脂表面光滑，但切割效率较低。对于复合树脂修复体的大量去除和塑形，建议先使用15 - 40微米的抛光金刚砂钻，然后使用碳化钨车针完成修复体的抛光。
