Cutting efficiency of apical preparation using ultrasonic tips with microprojections: confocal laser scanning microscopy study.
10.5395/rde.2014.39.4.276
- Author:
Sang Won KWAK
1
;
Young Mi MOON
;
Yeon Jee YOO
;
Seung Ho BAEK
;
Woocheol LEE
;
Hyeon Cheol KIM
Author Information
1. Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Korea. golddent@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Apical preparation;
Apical surgery;
Cutting efficiency;
Microprojection;
Root crack;
Ultrasonic tip
- MeSH:
Dentin;
Diamond;
Microscopy, Confocal*;
Tooth;
Ultrasonics*
- From:Restorative Dentistry & Endodontics
2014;39(4):276-281
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVES: The purpose of this study was to compare the cutting efficiency of a newly developed microprojection tip and a diamond-coated tip under two different engine powers. MATERIALS AND METHODS: The apical 3-mm of each root was resected, and root-end preparation was performed with upward and downward pressure using one of the ultrasonic tips, KIS-1D (Obtura Spartan) or JT-5B (B&L Biotech Ltd.). The ultrasonic engine was set to power-1 or -4. Forty teeth were randomly divided into four groups: K1 (KIS-1D / Power-1), J1 (JT-5B / Power-1), K4 (KIS-1D / Power-4), and J4 (JT-5B / Power-4). The total time required for root-end preparation was recorded. All teeth were resected and the apical parts were evaluated for the number and length of cracks using a confocal scanning micrscope. The size of the root-end cavity and the width of the remaining dentin were recorded. The data were statistically analyzed using two-way analysis of variance and a Mann-Whitney test. RESULTS: There was no significant difference in the time required between the instrument groups, but the power-4 groups showed reduced preparation time for both instrument groups (p < 0.05). The K4 and J4 groups with a power-4 showed a significantly higher crack formation and a longer crack irrespective of the instruments. There was no significant difference in the remaining dentin thickness or any of the parameters after preparation. CONCLUSIONS: Ultrasonic tips with microprojections would be an option to substitute for the conventional ultrasonic tips with a diamond coating with the same clinical efficiency.
