Garman T A, Binon P P, Averette D, Talman R G
J Prosthet Dent. 1980 Mar;43(3):298-302. doi: 10.1016/0022-3913(80)90405-9.
A laboratory study has shown that the first-half of self-shearing 2-in-1 self-threading pins, sizes 0.031 inch and 0.024 inch, fail to reach full channel depth when placed with either a hand wrench or an Auto Klutch handpiece. The average discrepancy of penetration is about 0.75 mm. This discrepancy in seating results in a significant excess pin length extending into the tooth preparation, which compromises the strength characteristics of the amalgam restoration.
一项实验室研究表明，尺寸为0.031英寸和0.024英寸的自剪切式二合一自攻丝钉在上半部分使用手动扳手或自动离合机头放置时，无法达到全根管深度。平均穿透差异约为0.75毫米。这种就位差异导致大量多余的钉长度延伸到牙体预备中，这会损害汞合金修复体的强度特性。
