Al-Omari W M, Mitchell C A, Cunningham J L
Jordan University of Science and Technology, Department of Restorative Dentistry, Irbid, Jordan.
J Oral Rehabil. 2001 Jul;28(7):645-50. doi: 10.1046/j.1365-2842.2001.00722.x.
The aim of dental adhesive restorations is to produce a long lasting union between the restoration and the tooth structure. This bond depends on many variables including the geometry of the preparation and the type of bonding agent or luting cement. It is therefore suggested that the topography of the tooth surface may influence the wettability and the bonding quality of adhesive systems. This study measured the surface roughness and wettability of enamel and dentine after preparation with different dental burs. The mesial and distal surfaces of 15 extracted sound human premolar teeth were prepared with a tungsten carbide crown bur, a diamond bur and a tungsten carbide finishing bur and finished in enamel or dentin, respectively. The prepared surfaces were analysed with a surface profilometer and scanning electron microscopy (SEM). The contact angle of distilled water on each of the prepared surfaces was used as the measure of wettability. The differences in average surface roughness (Ra) were significant between the rotary instrument groups, as revealed by a two-way ANOVA test. No differences were detected between enamel and dentine surfaces prepared with the same type of dental bur. The smoothest surfaces were those completed with tungsten carbide finishing burs. The diamond bur preparations were intermediate in the roughness assessment and the tungsten carbide crown burs gave the roughest surfaces. There were no significant differences in the contact angle measurements for the various groups. It was concluded that the surface roughness of enamel and dentine prepared by different rotary instruments had no significant influence on the wettability of distilled water on these surfaces.
牙科粘结修复的目的是在修复体与牙体组织之间形成持久的结合。这种粘结取决于许多因素，包括窝洞预备的几何形状以及粘结剂或粘结水门汀的类型。因此，有人提出牙面的形貌可能会影响粘结系统的润湿性和粘结质量。本研究测量了使用不同牙科车针预备后釉质和牙本质的表面粗糙度和润湿性。用碳化钨冠部车针、金刚石车针和碳化钨修整车针分别对15颗拔除的健康人前磨牙的近中面和远中面进行预备，并分别在釉质或牙本质中完成。用表面轮廓仪和扫描电子显微镜（SEM）对预备后的表面进行分析。将蒸馏水在每个预备表面上的接触角用作润湿性的度量。双向方差分析测试显示，旋转器械组之间的平均表面粗糙度（Ra）差异显著。用同类型牙科车针预备的釉质和牙本质表面之间未检测到差异。最光滑的表面是用碳化钨修整车针完成的表面。金刚石车针预备的表面粗糙度处于中间水平，碳化钨冠部车针预备的表面最粗糙。各组的接触角测量结果无显著差异。得出的结论是，不同旋转器械预备的釉质和牙本质的表面粗糙度对蒸馏水在这些表面上的润湿性没有显著影响。
