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The effect of ultrasonic file sizes on smear layer removal in passive ultrasonic irrigation

대한치과의사협회지 2020년 58권 5호 p.276 ~ 283
Kang Hye-Ju, Jung Se-Ra, 조아라, 박미곤, 조형훈,
소속 상세정보
 ( Kang Hye-Ju ) - Chosun University School of Dentistry Department of Conservative Dentistry
 ( Jung Se-Ra ) - Chosun University School of Dentistry Department of Conservative Dentistry
조아라 ( Cho A-Ra ) - Chosun University School of Dentistry Department of Conservative Dentistry
박미곤 ( Park Mi-Gon ) - Chosun University School of Dentistry Department of Conservative Dentistry
조형훈 ( Jo Hyoung-Hoon ) - Chosun University School of Dentistry Department of Conservative Dentistry

Abstract


Objectives: The aim of this study was to evaluate the efficacy of CK files as an ultrasonic instrument, and to determine most efficient file size for smear layer removal.

Materials and Methods: Thirty-six extracted human mandibular premolars with single, straight root canals and mature apices were mechanically prepared and randomly divided into three groups. Group 1 (Control) underwent conventional needle irrigation, Group 2 (CKS) underwent passive ultrasonic irrigation with a #20 CK file, and Group 3 (CKL) underwent passive ultrasonic irrigation with a #30 CK file. After preparation and irrigation, all teeth were dried and split with a chisel to obtain the mesial and distal half of their roots. Each sample was evaluated using a scanning electron microscope, and data were analyzed using the Kruskal-Wallis and Mann-Whitney rank sum tests (p<0.05).

Results: The CKS group showed less debris in the apical third than the other groups (p<0.05). In this section, no significant difference was observed among the other groups. And, there was no significant difference among any groups for the middle third section.

Conclusion: This study showed that PUI with #20 CK file removed more smear layer compared to using #30 CK file at the apical third of the root canal.

키워드

EDTA; Passive ultrasonic irrigation; Smear layer; Sodium hypochlorite

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