Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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An evaluation of canal curvature at the apical one third in type II mesial canals of mandibular molars

하악 대구치의 II형 근심 근관에서 치근단 부위의 만곡도 조사

  • Yun, Hye-Rim (Department of Conservative Dentistry, Chosun University School of Dentistry) ;
  • Lee, Dong-Kyun (Department of Conservative Dentistry, Chosun University School of Dentistry) ;
  • Hwang, Ho-Keel (Department of Conservative Dentistry, Chosun University School of Dentistry)
  • 윤혜림 (조선대학교 치과대학 치과보존학교실) ;
  • 이동균 (조선대학교 치과대학 치과보존학교실) ;
  • 황호길 (조선대학교 치과대학 치과보존학교실)
  • Received : 2011.12.25
  • Accepted : 2012.04.14
  • Published : 2012.06.01
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Abstract

Objectives: The purpose of this study was to evaluate the buccolingual curvature at the apical one third in type II mesial canals of mandibular molars using the radius and angle of curvature. Materials and Methods: Total 100 mandibular molars were selected. Following an endodontic access in the teeth, their distal roots were removed. #15 H- or K-files (Dentsply Maillefer) were inserted into the mesiobuccal and mesiolingual canals of the teeth. Radiographs of the teeth were taken for the proximal view. Among them, type II canals were selected and divided into two subgroups, IIa and IIb. In type IIa, two separate canals merged into one canal before reaching the apex and in type IIb, two separate canals merged into one canal within the apical foramen. The radius and angle of curvature of specimens were examined. Results: In type II, mean radius of curvature in mesiolingual and mesiobuccal canals were 2.82 mm and 3.58 mm, respectively. The radius of the curvature of mesiolingual canals were significantly smaller than that of mesiobuccal canals in type II, and especially in type IIa. However, there were no statistically significant differences in radius of curvature between mesiobuccal and mesiolingual canals in type IIb and there were no significant differences in angle of curvature between type IIa and IIb. Conclusion: In this study, type II mesial canals of mandibular molars showed severe curvature in the proximal view. Especially, mesiolingual canals of type IIa had more abrupt curvature than mesiobuccal canals at the apical one third.

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References

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