하악 제1대구치 원심 근관의 형태

Abstract

ABSTRACT Types of the distal root canal in mandibular 1st molar

Son, Hee-Seok, D.D.S. Advisor : Prof. Hwang, Ho-Keel, D.D.S., Ph.D. Department of Dentistry, Graduate School of Chosun University

The purpose of this study was to investigate the types of distal canal in mandibular 1st molars and evaluate the proportion of root canal types in Korean population. The radiographs and clinical records of the distal root canals in the mandibular 1st molars that had been treated endodontically in the Chosun University Dental Hospital from 2005 to 2008 were reviewed and categorized. A total of 1423 cases were investigated in this study. The findings were then recorded and tabulated according to the Weine's classification of root canal types; Type I is a single canal from pulp chamber to apex, Type II is two separate canals leaving the chamber but merging short of the apex to form only one canal, Type III is two separate canals leaving the chamber and exiting the root in separate apical foramina and Type IV is one canal leaving the pulp chamber but dividing short of the apex into two separate and distinct canals with separate apical foramina. In addition, we investigated the relative incidences of root canal types with the variables according to patient's gender and tooth location whether the tooth is right or left. And the results were statistically analyzed using χ2 test using Sigmastat 3.5 with p value of 0.05.

The results were as follows : 1.The most common type of distal root canal of mandibular 1st molar is type III (p<0.05) 2.There was no correlation between distal canal type of mandibular 1st molars and patient's gender. 3.There was correlation between distal canal type of right mandibular 1st molar and left one (p<0.05). 4.There was high frequency of bilateral coincidence in same patient who was done root canal treatment both mandibular 1st molars.

In the distal root canal type of mandibular 1st molar, the incidence of type III is more higher than type I and II in Korean population. We must be confirm the presence of the disto-lingual root of the mandibular 1st molar using a standard radiograph during root canal treatment.