Galun E A, Goodacre C J, Dykema R W, Moore B K, Sowinski L L
J Prosthet Dent. 1986 Sep;56(3):292-7. doi: 10.1016/0022-3913(86)90006-5.
This research quantitatively compared the retention and resistance of various designs of maxillary premolar partial veneer crown preparations. Crowns were evaluated with and without proximal boxes and occlusal pins. In the absence of boxes or grooves, pins markedly enhanced both retention and resistance. In the presence of proximal boxes, pins contributed only to retention and had no significant effect on resistance. If pins are used, the cement should be spiralled into the pin hole. As resistance is usually the more crucial parameter in preparation designs, it seems that wherever efficient axial modifications can be incorporated, the pinhole modification may be of little advantage.
本研究定量比较了上颌前磨牙部分贴面冠预备体不同设计的固位力和抗力。对有或无邻面箱和咬合针的冠进行了评估。在没有箱或沟的情况下，针显著增强了固位力和抗力。在有邻面箱的情况下，针仅有助于固位，对抗力无显著影响。如果使用针，应将粘固剂螺旋填入针孔。由于抗力通常是预备体设计中更关键的参数，因此似乎只要能纳入有效的轴向修改，针孔修改可能优势不大。
