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[Morphology of cross-sectioned root canal in Chinese mandibular permanent incisors]
Ding-Ming Huang1, Yu-Qing Hao, Shi-Gao Luo
1Department of Conservative Dentistry, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
Objective:
To identify morphological features of cross-sectioned root canal in Chinese mandibular permanent incisors.
Methods:
Twenty mandibular permanent incisors were selected in this study. The tooth roots were embedded in resin and transversely sectioned with a low-speed diamond saw. The number of root canal and the morphology and isthmus of the root canal were observed under a stereo-microscope, which included the measure of the canal diameter.
Results:
The double root canal comprised 22.5%, 30.0%, and 15.0% in crown third, middle third, and apical third root canals of the mandibular permanent incisors, respectively. The long oval canal comprised 44.8%, 77.0%, and 44.5% in crown third, middle third, and apical third root canals, respectively. The canal isthmus comprised 62.5%, 75.0%, and 48.7% in crown third, middle third, and apical third root canals, respectively. The diameter of buccal-lingual canal was at least 2 times of the diameter of mesial-distal canal.
Conclusion:
The cross-sectioned root canal morphology in Chinese mandibular permanent incisors varies considerably. But most have long oval and canal isthmus, which imposes a great challenge for root canal therapy.
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