两种牙齿操作长度电测仪准确性的体外研究  

An in vitro study on the accuracy of two electronic root canal length meters

作　　者：唐晓琳[1] 潘春玲[1] 王贤辐[1] 

机构地区：[1]中国医科大学口腔医学院,辽宁沈阳110002

出　　处：《牙体牙髓牙周病学杂志》2002年第10期547-549,共3页Chinese Journal of Conservative Dentistry

基　　金：辽宁省教育厅高等学校科学研究项目(20122173)

摘　　要：目的:测试Tri Auto ZX和JUSTYⅡ牙齿操作长度电测仪对根尖孔定位的准确性,并评价根尖孔大小对准确性的影响。方法:分别用Tri Auto ZX和JUSTYⅡ测定42个离体根管“APEX”读数的电测操作长度,计算测量偏差和准确率。测定并分析根尖孔面积、直径及其与测量偏差之间的关系。结果:Tri Auto　ZX的测量偏差显著低于JUSTY Ⅱ（P<0.01）。距解剖根尖孔±0.5mm与±1.0mm范围内准确率显著高于JUSTYⅡ（P<0.01）。根尖孔面积与两电测仪测量偏差均有显著正相关关系（P<0.01）。Tri Auto ZX能够进行准确测量的临界根尖孔面积大于JUSTY Ⅱ。结论:本实验模型中以解剖根尖孔为参考点,Tri Auto ZX的“APEX”读数处准确性优于JUSTYⅡ;Tri Auto ZX可在更大根尖孔范围内准确测量。AIM: To evaluate the accuracy of Tri Auto ZX electronic apex locator and JUSTY Ⅱ electronic canal length meter and the influence of the size of apical foramen. METHODS; 42 root canals were measured in vitro. Electronic working length measurements ( EMLM) were recorded with Tri Auto ZX and JUSTY Ⅱ at the reading ' APEX'. The deviation of EMLM from the anatomical apical foramen and the accuracy were determined. The relationship between the area and diameter of the apical foramen and to the deviation was analyzed. RESULTS: The deviation of Tri Auto ZX was lower than those of JUSTY Ⅱ (P < 0. 01). Within ±0.5 mm and ±1.0 mm from the apical foramen , the accuracy of Tri Auto ZX was higher than the JUSTY Ⅱ ( P < 0. 01). Both deviations caused by Tri Auto ZX and by JUSTY Ⅱ were positively related to the area of the apical foramen (P <0. 01) . The critical area of the apical foramen which controlled the deviation was within 0. 5 mm from the apical foramen for Tri Auto ZX,which was larger than that of the JUSTY Ⅱ. CONCLUSION; In this study, when the anatomical apical foramen is chosen as the reference point, Tri Auto ZX is more accurate than JUSTY Ⅱ at the reading 'APEX'. Tri Auto ZX could locate the apex accurately at a wider extent of the area of the apical foramen.

关 键 词：牙齿操作长度电测仪 根尖孔 TriAutoZx JUSTYⅡ 体外研究 

分 类 号：R781.05[医药卫生—口腔医学]