Turner C H
J Oral Rehabil. 1982 May;9(3):193-202. doi: 10.1111/j.1365-2842.1982.tb01009.x.
A retrospective study of 5-year-old post-retained crowns made using a matched reamer/sprue technique, was carried out. Standardized radiographs enabled the length of post within the root to be compared with the maximum available length, and this was related to the success of the restoration. Six posts (11.5% of the sample) had become dislodged, of which four were successfully re-cemented. The range of root utilization varied from 46 to 137% of the calculated ideal maximum length, indicating that radiographs or measurements were not used routinely as an aid to root preparation, and in some cases the integrity of the apical seal had been severely prejudiced. Despite some very short posts, no roots had fractured. The minimum length of post which ideally should be used has been calculated as 9 mm.
对采用匹配铰刀/浇口技术制作的5年留存桩冠进行了一项回顾性研究。标准化的X光片能够将牙根内桩的长度与最大可用长度进行比较，这与修复的成功与否相关。6个桩（占样本的11.5%）发生了松动，其中4个成功重新粘结。牙根利用率在计算出的理想最大长度的46%至137%之间变化，这表明X光片或测量并未常规用于辅助牙根预备，在某些情况下，根尖封闭的完整性受到了严重损害。尽管有一些桩非常短，但没有牙根发生骨折。理想情况下应使用的桩的最小长度经计算为9毫米。
