Effects of file tip size on the accuracy of Root ZX apex locator in enlarged root canals: An in vitro study
- VernacularTitle:根管锉尖直径对Root ZX测量仪准确性影响的研究
- Author:
Hongmei LI
- Publication Type:Journal Article
- Keywords:
Root canal preparation;
File tip size;
Root canal working length;
Root canal apex locator
- From:
Journal of Practical Stomatology
2000;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the effects of file tip size on the accuracy of Root ZX apex locator during electronic measurements in enlarged root canals.Methods: Forty premolars mounted in 20 g/L agar were used.First,the canals were instrumented using size 15-40 K-files with a size 40 as the master apical file(MAF).Second,the canals were enlarged using 45-60 K-files with the step-back way and 60 K-file as the MAF.In each step,the length was measured with a Root ZX using small and large tip size files.Results: File tip size and the degree of root canals enlarged both had a significant influence on the measurement,the difference was 0.22 mm.Conclusion: The measured working length with smaller size files become shorter when the root canals are enlarged.A file size comparable to the root canals should be used with root length measurement before root canal fillings.
