Determination of working length for teeth with wide or immature apices: a review.
- Y J A Kim, N P Chandler
- International endodontic journal
In this study, 25 extracted single canal teeth were provided access cavity and became flat – from cusp area – for the purpose of creating suitable reference point. The teeth were numbered; then actual measure length of canals with proper k-file were measured and determined Then, canals of teeth were filing – about 1 mm more than their actual length (wl+1) – to the file 30 ; so, apical constriction was destroyed and disappeared. Then they were instrumented to the file 60. Then teeth mounted in alginate and working length measurement with Root-ZX apex locator. In next step PA radiography was done by parallel method. After collecting the data, they were analyzed by paired Ttest of descriptive statistics. With considering the range of 0.5 mm error – acceptable measuring was 88% for Root-ZX, and in the range of 1 mm error, its admission rate was 100%. With considering the range of 1 mm error – acceptable measuring for radiography was 72%, and in the range of 0.5 mm error, its admission rate was 40%. Since, in destroying apical constriction, the accuracy of Root ZX was more than radiography, using Root ZX apex locater is more useful and offered.