Cutting efficiency of apical preparation using ultrasonic tips with microprojections: confocal laser scanning microscopy study
곽상원, 문영미, 유연지, 백승호, 이우철, 김현철,
소속 상세정보
곽상원 ( Kwak Sang-Won ) - Pusan National University School of Dentistry Department of Conservative Dentistry
문영미 ( Moon Young-Mi ) - Wonkwang University Daejeon Dental Hospital Department of Conservative Dentistry
유연지 ( Yoo Yeon-Jee ) - Seoul National University School of Dentistry Department of Conservative Dentistry
백승호 ( Baek Seung-Ho ) - Seoul National University School of Dentistry Department of Conservative Dentistry
이우철 ( Lee Woo-Cheol ) - Seoul National University School of Dentistry Department of Conservative Dentistry
김현철 ( Kim Hyeon-Cheol ) - Pusan National University School of Dentistry Department of Conservative Dentistry
KMID : 1034420140390040276
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.
키워드
Apical preparation; Apical surgery; Cutting efficiency; Microprojection; Root crack; Ultrasonic tip
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