Chougule Rahul Babaso, Padmanabhan Makkada Yuvaraj, Mandal Madhumita Saumitra
Department of Pedodontics, Tatyasaheb Kore Dental College, Kolhapur, Maharashtra, India.
Pediatr Dent. 2012 May-Jun;34(3):53-6.
The purpose of this 3-staged, in vivo, crossover study was to comparatively evaluate the accuracy of radiograph-based and apex locator-based measurements of working length in primary molars with physiological root resorption.
Endodontic access cavity preparations were performed on 13 primary molars in 10 cooperative pediatric dental outpatients who met the selection criteria. Calibrated investigators estimated the root canal length in a total of 30 canals in these 13 primary molars using both apex locators and radiographs. Following determination of working length, the teeth were extracted for in vitro measurement of the actual root canal length. The root canal lengths obtained through these 3 techniques were compared statistically and assessed for the presence of significant differences.
Significant correlation (intraclass correlation=0.99, P<.001) could be detected between working length measurements obtained using both the techniques and direct measurements of root canals. Acceptable measures of working length (+1 mm of actual length) could be obtained in 97% and 93% of canals using apex locators and radiographs, respectively.
Apex locators can be considered a viable substitute for radiographs in estimating working length during pulpectomies of primary teeth.
这项分三个阶段的体内交叉研究旨在比较评估基于根尖定位仪和基于X线片测量生理性牙根吸收的乳磨牙工作长度的准确性。
对10名符合入选标准的合作儿科牙科门诊患者的13颗乳磨牙进行牙髓治疗开髓预备。经过校准的研究人员使用根尖定位仪和X线片对这13颗乳磨牙共30个根管的根管长度进行估计。确定工作长度后，将牙齿拔除以进行体外实际根管长度测量。对通过这三种技术获得的根管长度进行统计学比较，并评估是否存在显著差异。
使用两种技术获得的工作长度测量值与根管直接测量值之间存在显著相关性（组内相关系数=0.99，P<0.001）。分别使用根尖定位仪和X线片时，在97%和93%的根管中可获得可接受的工作长度测量值（实际长度±1mm）。
在乳牙牙髓摘除术中估计工作长度时，根尖定位仪可被视为X线片的可行替代方法。
