Journal of Peking University(Health Sciences) ›› 2017, Vol. 49 ›› Issue (1): 67-070. doi: 10.3969/j.issn.1671-167X.2017.01.011

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Observation of bone morphology in furcation defects of mandibular molars using cone beam computed tomography

ZHU Jie1,2,OUYANG Xiang-ying1△   

  1. (1. Department of Periodontology, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China; 2. Department of Stomatology, Peking University International Hospital, Beijing 102206, China)
  • Online:2017-02-18 Published:2017-02-18
  • Contact: OUYANG Xiang-ying E-mail:kqouyangxy@126.com

Abstract:

Objective: To observe mesial-distal bone morphology in classes Ⅱ and Ⅲ furcation involvements (FI) of mandibular molars using cone beam computed tomography (CBCT), to develop a classification system of mesial-distal bone morphology of furcation defects and to observe the intrabony defects  on CBCT images. Methods: Based on the existing CBCT data, the mandibular molars with horizontal bone defects in furcation area were observed. One hundred and seventeen sites of 81 mandibular molars with class Ⅱ or class Ⅲ FIclassified on CBCT images were included. The classification system of mesial-distal bone morphology of furcation defects was developed. According to the location of the line drawn from mesial to distal alveolar bone crest (AC-line) of the tooth and bone level under furcation fornix, the bone morphology was classified into three types, including concave type, flat type and protruding type. The concave type was divided into two subtypes according to the location of AC-line and furcation fornix (Fx), which were subtype 1(AC-line coronal or equal to Fx)and subtype 2 (AC-line apical to Fx).The frequency of each type was calculated and analyzed. The intrabony defects was observed on sagittal CBCT images. Results: In the 117 sites with FI, the flat type appeared with the highest rate (64.10%) and the protruding type appeared with the lowest rate (6.84%). The rates of subtype 1 and subtype 2 of concave type were 13.68% and 15.38%, respectively. The rate of subtype1 which was supposed to be beneficial for bone regeneration was 8.96% in class Ⅱ FI and 20.00% in class Ⅲ FI. Thirtyone intrabony defects were found among the 117 FI, 29 of which appeared in proximal aspect of the tooth and the left 2 appeared in furcation area. The highest frequency of the intrabony defects was found in subtype 1 of concave type. Conclusion: The classification of mesial-distal bone morphology on CBCT images may be helpful for clinicians to make accurate treatment plan before surgery and could be used in future studies to understand the influence of bone morphology on regenerative therapy for furcation defects.

Key words: Furcation defects, Mandibular molars, Bone morphology

CLC Number: 

  • R781.4
[1] Shu-wen SHI,Yang MENG,Jian JIAO,Wen-jing LI,Huan-xin MENG,Qing-xian LUAN,Wan-chun WANG. Tooth loss and multivariable analysis after 5-year non-surgical periodontal treatment on molars with furcation involvement [J]. Journal of Peking University(Health Sciences), 2019, 51(5): 913-918.
[2] QIAO Jing, DUAN Jin-yu, CHU Yi, SUN Chang-zhou. Effect of concentrated growth factors on the treatment of degree Ⅱ furcation involvements of  mandibular molars [J]. Journal of Peking University(Health Sciences), 2017, 49(1): 36-042.
[3] QIAO Jing, DUAN Jin-Yu, SUN Chang-Zhou, LIU Deng-Gao. Effect of regenerative therapy for the furcation involvements of mandibular molars evaluated by cone-beam computed tomography [J]. Journal of Peking University(Health Sciences), 2014, 46(5): 727-732.
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