Standlee J P, Caputo A A, Hanson E C
J Prosthet Dent. 1978 Apr;39(4):400-5. doi: 10.1016/s0022-3913(78)80156-5.
The retentive capacity of three preformed endodontic dowel designs was compared at two lengths and two diameters, with three different cements. The greatest single factor influencing retention of these devices was the design used. Of the types tested in this study, the most retentive were threaded, parallel-sided dowels screwed into tapped channels. Serrated, parallel-sided dowels cemented in matched cylindrical channels provided intermediate retention, and smooth-sided tapered posts were the least retentive. Another major factor in retention was the length of imbedment into dentin. An increase in dowel imbedment depth usually corresponded to increased retention. The effect of cement type was significant only with tapered dowels. Zinc phosphate cement was most retentive, carboxylate cement exhibited intermediate retention, and the epoxy cement was least retentive. For the other post designs, cement type had no significant effect on retentive capacity. Finally, variations in dowel diameter had no significant effect on retentive ability.
在两种长度和两种直径下，使用三种不同的粘结剂，比较了三种预制根管桩的固位能力。影响这些装置固位的最大单一因素是所使用的设计。在本研究测试的类型中，固位力最强的是拧入攻丝通道的螺纹平行边桩。粘结在匹配圆柱通道中的锯齿状平行边桩提供中等固位力，而光滑边锥形桩的固位力最小。固位的另一个主要因素是桩在牙本质中的埋入长度。桩埋入深度的增加通常对应于固位力的增加。粘结剂类型的影响仅在锥形桩中显著。磷酸锌粘结剂的固位力最强，羧酸盐粘结剂表现出中等固位力，而环氧树脂粘结剂的固位力最弱。对于其他桩设计，粘结剂类型对固位能力没有显著影响。最后，桩直径的变化对固位能力没有显著影响。
