• Title/Summary/Keyword: 근관형태

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CROSS-SECTIONAL MORPHOLOGY AND MINIMUM CANAL WALL WIDTHS IN C-SHAPED ROOT OF MANDIBULAR MOLARS (C-shaped canal의 절단면 분석을 통한 근관형태의 변화와 근관과 치아외벽간의 최소거리 분석에 관한 연구)

  • Song, Byung-Chul;Cho, Yong-Bum
    • Restorative Dentistry and Endodontics
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    • v.32 no.1
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    • pp.37-46
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    • 2007

  • The C-shaped canal system is an anatomical variation mostly seen in mandibular second molars, although it can also occur in maxillary and other mandibular molars. The main anatomical feature of C-shaped canals is the presence of fins or web connecting the individual root canals. The complexity of C-shaped canals prevents these canals from being cleaned, shaped, and obturated effectively during root canal therapy, and sometimes it leads to an iatrogenic perforation from the extravagant preparation. The purpose of this study was to provide further knowledge of the anatomical configuration and the minimal thickness of dentinal wall according to the level of the root. Thirty extracted mandibular second molars with fused roots and longitudinal grooves on lingual or buccal surface of the root were collected from a native Korean population. The photo images and radiographs from buccal, lingual, apical direction were taken. After access cavity was prepared, teeth were placed in 5.25% sodium hypochlorite solution for 2 hours to dissolve the organic tissue of the root surface and from the root canal system. After bench dried and all the teeth were embedded in a self-curing resin. Each block was sectioned using a microtome (Accutom-50, Struers, Denmark) at interval of 1 mm. The sectioned surface photograph was taken using a digital camera (Coolpix 995, Nikon, Japan) connected to the microscope. 197 images were evaluated for canal configurations and the minimal thickness of dentinal wall between canal and external wall using 'Root Thickness Gauge Program' designed with Visual Basic. The results were as follows : 1. At the orifice level of all teeth, the most frequent observed configuration was Melton's Type C I (73%), however the patterns were changed to type C II and C III when the sections were observed at the apical third. On the other hand, the type C III was observed at the orifice level of only 2 teeth but this type could be seen at apical region of the rest of the teeth. 2. The C-shaped canal showed continuous and semi-colon shape at the orifice level, but at the apical portion of the canal there was high possibility of having 2 or 3 canals 3. Lingual wall was thinner than buccal wall at coronal, middle, apical thirds of root but there was no statistical differences.

  • https://doi.org/10.5395/JKACD.2007.32.1.037 인용 PDF KSCI

ROOT CANAL TREATMENT OF A MANDIBULAR SECOND PREMOLAR WITH THREE SEPARATE ROOT CANALS (세 개의 분리된 근관을 갖는 하악 제2소구치의 치험례)

  • Lee, Seok-Ryun;Shin, Seol-Hee;Hong, Sung-Ok;Song, Chang-Kyu;Chang, Hoon-Sang;Min, Kyung-San
    • Restorative Dentistry and Endodontics
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    • v.35 no.4
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    • pp.302-305
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    • 2010

  • Mandibular premolars show a wide variety of root canal anatomy. Especially, the occurrence of three canals with three separate foramina in mandibular second premolars is very rare. This case report describes the root canal treatment of an unusual morphological configuration of the root canal system and supplements previous reports of the existence of such configuration in mandibular second premolar.

  • https://doi.org/10.5395/JKACD.2010.35.4.302 인용 PDF KSCI

A STUDY ON THE C-SHAPED ROOT CANAL SYSTEM OF MANDIBULAR SECOND MOLAR (하악 제2대구치의 C형 근관계에 관한 연구)

  • Lee, Dong-Gyun;Park, Jun-Mo;Hwang, Ho-Keel
    • Restorative Dentistry and Endodontics
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    • v.32 no.4
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    • pp.335-342
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    • 2007

  • C-shaped canals are known to present a complex canal anatomy with numerous fins connecting individual canals, thus requiring supplementary effort to accomplish a successful root canal treatment. This study examined the frequency of the C-shaped mandibular second molars and interrelation between the clinical records and radiographs to recognize them treated in the Department of Conservative Dentistry of the Chosun University Dental Hospital during a six-year period (1998-2004). This study reviewed the clinical records of 227 patients who underwent root canal treatment of the mandibular second molars. After opening the chamber, those cases with C-shaped orifices in the pulpal floor were selected, ana the C-shaped root canal types were classified according to Melton's criteria. Three experienced dentists evaluated the radiographs of the C-shaped mandibular second molar on a viewer using a magnifying glass in order to determine if the root apex was fused or separated, the distal root canal was either centered or mesial shifted in the distal root, and if there was bilateral symmetry in a panorama. In conclusion, there is a high frequency of C-shaped mandibular second molars in Koreans. Simultaneous interpretation of the root shape and distal root canal using the preoperative, working length and post-treatment radiographs is important for diagnosing a C-shaped mandibular second molar.

  • https://doi.org/10.5395/JKACD.2007.32.4.335 인용 PDF KSCI