단근 소구치의 근관계 형태에 따른 치근단공의 형태

Abstract

ABSTRACT

THE APICAL FORAMEN SHAPE ACCORDING TO THE ROOT CANAL SYSTEM OF PREMOLARS WITH SINGLE ROOT

Park, Min-Soo, D.D.S. Advisor : Prof. Hwang, Ho-Keel, D.D.S., Ph.D. Department of Dentistry, Graduate School of Chosun University

During root canal instrumentation, an exact determination of the apical root canal diameters is crucial for correct cleaning and shaping of a root canal. The aim of this study was to investigate the apical root canal morphology and diameters according to the root canal system of premolar. Sixty extracted premolars were assigned to three groups according to the root canal system (type 1, 2, 3) of 20 teeth each using the radiograph. The root tip was cut horizontally 1 mm from the anatomical apex and the apical cross-section was visualized using microscope (BX60MF, OLYMPUS OPTICAL Co., LTD. Japan) at 50⨯. Statistical analysis of the collected data was performed. The results were as follows : 1.In apical root canal morphology at cross-sectional view, the most common shape was round in type 1, flat in type 2, and oval in type 3. 2.In apical root canal diameters at cross-sectional view, there was a significant difference between the longest diameter and shortest diameter in all types (p<0.05). The longest diameter was 0.331 mm in type 1, 0.519 mm in type 2, and 0.310 mm in type 3. There was a significant difference between type 1, 3 and type 2 (p<0.05). In conclusion, the morphology and diameter of apical root canal was different according to the root canal system. Therefore, the clinician has to consider the initial apical file size in view of the apical root canal shape by root canal system.