Detailed canal morphology comparison of micro-computed tomography and clearing technique in permanent first molar mesiobuccal and mesial roots : 상하악 제1대구치 근심협측치근과 근심치근에서의 미세전산화 단층촬영과 치아투명화 방법을 이용한 미세 근관 형태 비교

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치의학대학원 치의과학과
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서울대학교 대학원
Canal configurationclearing techniquemicro-computed tomographyminimum intensity projectionVertucci’s classificationvolume rendering
학위논문 (박사)-- 서울대학교 대학원 : 치의과학과, 2015. 2. 금기연.
Micro-computed tomography (MCT) with alternative image reformatting techniques shows complex and detailed root canal anatomy. This study compared the MCT images reconstructed by two-dimensional (2D) thin-slab minimum intensity projection (TS-MinIP) and three-dimensional (3D) volume-rendering technique with the images obtained from the clearing technique, to study detailed root canal morphology in maxillary first molar mesiobuccal (MB) roots and mandibular first molar mesial (MS) roots.

Extracted human maxillary first molar MB roots (n = 18) and mandibular first molar MS roots (n = 31) were scanned by MCT (Skyscan 1172). The MCT images were constructed using 2D TS-MinIP and 3D volume-rendering technique. The same teeth were then processed by the clearing technique and the clearing images were obtained. For each root, the clearing, the 2D TS-MinIP, the 3D volume-rendered, and the combined 2D TS-MinIP and 3D volume-rendered images were examined independently by 4 dentists and categorized according to Vertuccis classification. Fine anatomical structures such as accessory canals, intercanal communications, and loops were also compared.

Complex canal systems were more clearly visible in the MCT images than the clearing images. On each root, the 3 MCT images showed the same canal configuration, whereas the clearing images showed less complicated configuration than the MCT ones. The frequency of non-classifiable configurations by Vertuccis classification was shown as 38.9% in maxillary first molar MB roots and 51.6% in mandibular first molar MS roots. Fine anatomical structures such as intercanal communications, accessory canals, and loops were mostly found with the combined 2D TS-MinIP and 3D volume-rendered images.

The combined 2D TS-MinIP and 3D volume-rendered images of MCT could be useful for morphological study of complex root canal systems. In the future, the establishment of a systematic classification that embraces non-classifiable canal configurations found in this study may help the root canal morphological study.
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dental Science(치의과학과)Theses (Ph.D. / Sc.D._치의과학과)
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