Chan Paul W K, Chik Fu-Fai, Pow Edmond H N, Chow Tak-Wah
Oral Rehabilitation, Faculty of Dentistry, University of Hong Kong, Hong Kong, China.
Clin Implant Dent Relat Res. 2013 Aug;15(4):613-24. doi: 10.1111/j.1708-8208.2011.00386.x. Epub 2011 Oct 10.
The aim of this study was to develop and evaluate a new stereoscopic technique for conversion of radiographic guide into surgical guide for dental implant placement.
Ten partially dentate patients requiring 18 implants for tooth replacement were recruited. Radiographic guides were modified with the addition of index rods for double computed tomography scanning. Implant positions were planned with implant planning software, and the stereoscopic angulations were measured. The radiographic guides were converted into surgical guides using either a generic bench drill (Group A, n = 9) or a milling machine (Group B, n = 9). Stereolithographic surgical guides were also made for three patients (Group S, n = 5). Differences between the planned and actual angulations were tested by pair-sample t-test. Difference of mean angle deviation among groups was tested by Brown-Forsythe test. Differences were considered significant if p < .05.
Eighteen implant sites were successfully treated with the converted surgical guides. The mean angle deviation of Group A (1.3 ± 0.6°) was significantly greater than Group S (0.4 ± 0.6°), while no differences were found between Group B (0.9 ± 0.3°) and Group S. The linear error was greatest in Group A with 1.5 mm at the head and 1.8 mm at the apex of the implant.
The use of this new stereoscopic technique appears to be an acceptable alternative method for converting radiographic guide into surgical guide.
本研究旨在开发并评估一种用于将种植体植入的放射学导板转换为外科手术导板的新型立体技术。
招募了10名需要植入18颗种植体进行牙齿修复的部分牙列缺损患者。通过添加索引杆对放射学导板进行改良，以进行双重计算机断层扫描。使用种植体规划软件规划种植体位置，并测量立体角度。使用通用台式钻床（A组，n = 9）或铣床（B组，n = 9）将放射学导板转换为外科手术导板。还为三名患者制作了立体光刻外科手术导板（S组，n = 5）。通过配对样本t检验测试计划角度与实际角度之间的差异。通过Brown-Forsythe检验测试各组之间平均角度偏差的差异。如果p <.05，则认为差异具有统计学意义。
使用转换后的外科手术导板成功治疗了18个种植位点。A组的平均角度偏差（1.3±0.6°）显著大于S组（0.4±0.6°），而B组（0.9±0.3°）与S组之间未发现差异。A组的线性误差最大，种植体头部为1.5 mm，根尖为1.8 mm。
使用这种新的立体技术似乎是将放射学导板转换为外科手术导板的一种可接受的替代方法。
