机用ProTaper两步法预备根管的器械折断情况的体外研究

Abstract

Abstract: Abstract: Objective To evaluate the nickel titanium instruments fracture using two steps in root canal preparation. Method: Six hundred anterior teeth were selected. The teeth were divided into two groups, and there were 300 teeth in each group. One step group (control group), which prepared the root canal only once by ProTaper nickel—titanium files (S1-Sx-S2-F1-F2), and another group (experimental group) which prepared the root canal twice (First time:S1-G Grill-S2;Second time:F1-F2). The data were analyzed by SPSS18.0 software package for chi square test. Results: The incidence of instruments fracture and the length of instrument fracture part showed significant differences (p<0.05) between two groups. There were no significant differences in the length of root canal (P > 0.05) between two groups though the incidence of the experimental group instrument fracture was lower than that of control group. The majority of the instruments fracture frequently occurred in mandibular molars, in which there were 36(76.6%)fractures, especially in mesial root canals; and there were 28(59.6%)fractures in the midpoint of the curvature and 41 (87.2%) in quite complex canals with curvature more than 30。.Conclusion: Two steps preparation used in root canal therapy could decrease the incidence of instruments fracture. It is a recommended method to do two steps preparation combining with clinical practice.

Key words: ProTaper nickel- titanium rotary instruments , Instruments fracture, Root canal preparation

CLC Number:

R781.05

References

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The instrument fracture of rotary ProTaper files in root canal preparation: in vitro study

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