Effectiveness of Apical Preparation Size on the Removal of Smear Layer.

Abstract

Abstract: Objective: To compare the effect of five different apical preparation protocols in smear layer removal. Methods: Fifty extracted single-rooted maxillary anterior teeth were randomly divided into five groups,group A: root canals were prepared to 25^#(F2) by ProTaper system,and irrigated by NaOCl and EDTA; group B: root canals were prepared to 30^#(F3),and the preparation and irrigation protocols were same as group A; group C: root canals were prepared to 30^#(F3) by ProTaper system,and then the apical size enlarged to 35^#bystainless steel K-file.The irrigation protocol was same as group A; group D: root canals were prepared to 30^#(F3) by ProTaper system,and then the apical size enlarged to 40^#bystainless steel K-file.The irrigation protocol was same as group A; group E: root canal preparation was same as group D,and irrigated by distilled water.The samples were examined under a thermal field emission scanning electron microscope. Results: Group B,group C and group D showed lower scores than group A (P<0.05); group A,group B,group C and group D showed lower scores than group E (P<0.05). Conclusion: In smear layer removal,the minimum instrumentation for proper penetration of irrigants to the apical third of the canal is a 30^#file by ProTaper system.

Key words: Apical preparation size, Root canal irrigation, Root canal preparation, NaOCl Smear layer

CLC Number:

R781.05

MIAO Hui, GUO Xiang-jun, CHEN Min, et al. Effectiveness of Apical Preparation Size on the Removal of Smear Layer.[J]. Journal of Oral Science Research, 2015, 31(2): 160-162.

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