摘要
目的:比较Propex、Raypex5根尖定位仪在根尖狭窄破坏情况下定位根尖孔位置的准确性。方法:选取20颗新鲜拔除的单根管恒牙,采用锥形金刚砂针截去根尖,顺根管方向逆向自根尖破坏根尖狭窄,并放入实验模型中,使用Propex、Raypex5根尖定位仪定位根尖孔位置,比较两种根尖定位仪在不同根尖孔直径情况下测量结果与准确性的差异。结果:根尖孔开放情况下,同一根管,两种根尖定位仪测量值差值之间差异无显著性(P>0.05);以±0.5mm作为每个样本实际长度和电测长度差值的允许范围,同种根尖定位仪,不同根尖直径范围下,准确率差异有显著性(P<0.05),准确率随根尖直径增加而降低。结论:根尖狭窄被破坏后,根尖孔大小对Propex、Raypex5测量准确性有影响。临床上对根尖有吸收破坏或根尖未发育完全的患牙采用Propex、Raypex5电测法测量时,应考虑其可能的误差,配合试尖、X线等其他方法进行根尖定位。
Objective：To compare with the accuracy of Propex and Raypex5 electronic apex locators in canals with destroyed apical constrictions.Methods ：Apices of 20 extracted human teeth with single root canal were cut off and the apical constrictions were destroyed to different diameters by a cone shaped diamond bur.Apical foramen were located with Propex and Raypex5 electronic apex locators in models and the results and the accuracy of the two in different diameter ranges of apical foramens were compared.Results：On condition of the apical constrictions destroyed,the differences between actual root canal length and measured root canal length of two electronic apex locators in the same root canals were no statistically significant（P0.05）,and the differences between actual root canal length and measured root canal length of the same electronic apex locators in root canals with different diameter ranges of apical foramens were statistically significant（P0.05）,and the accuracy of two electronic apex locators decreased with the increase of diameters of apical foramens.Conclusion：On condition of the apical constrictions destroyed,the accuracy of Propex and Raypex5 was influenced by diameters of apical foramens.Clinically the measurement error should be considered when Propex or Raypex5 was used to locating apical foramens in roots with destroyed apical constrictions or not well developed apices,and apical foramens locating should be done by electronic apex locators combined with other methods.
出处
《激光杂志》
CAS
CSCD
北大核心
2011年第6期68-69,共2页
Laser Journal
关键词
根尖定位仪
根尖狭窄破坏
根尖孔直径
electronic apex locator
destroyed apical constriction
diameter of apical foramen
作者简介
唐宇英（1978-），女，重庆人，硕士。
通讯作者：陈方淳。
