Evaluation of the number of roots and root canal morphology and distribution in Chinese children’s mandibular first deciduous teeth by cone-beam computed tomography
Author(s): Guo Dongmei, She Fang, Xie Qi, Department of Orthodontics, Hainan Provincial People’s Hospital, Oral Consulting Room, Hainan Provincial People’s Hospital
Pages: 4265-4268
Year: 2019 Issue: 27
Journal: Chinese Journal of Tissue Engineering Research
Keyword: cone beam computed tomography; mandibular first deciduous molars; roots; three-root anatomic variation; root canal structure;
Abstract: BACKGROUND: X-ray is an important method for the diagnosis and treatment of dental pulp disease, but the three-dimensional anatomical structure of periapical film was compressed into two-dimensional image, so the morphology and variability of root canal are hard to be confirmed with the limited X-ray information.OBJECTIVE: To evaluate the number of tooth roots, the morphology/distribution of the mandibular first deciduous molar in Chinese children by cone-beam computed tomography.METHODS: Cone-beam CT data of 97 children mandibular first deciduous molar were collected. The study was approved by the Ethics Committee of Hainan Provincial People’s Hospital, and the children guardians were informed of the study process and signed the informed consent. The roots and the root canals of 158 mandibular first deciduous molar were analyzed retrospectively. The sex, age, root number, and root canal number/structure were recorded. SPSS 19.0 software was used for statistical analysis.RESULTS AND CONCLUSION:(1) The sex ratio of the participants was about 1:1, and the age was(8.17±3.16) years.(2) Among 158 mandibular first deciduous molars examined, 68 were left molars, and 90 were right molars; 76 were from the male, and 82 were from the female.(3) According to the number of tooth roots, teeth were divided into single-rooted(89.24%), double-rooted(8.86%), and three-rooted(1.90%).(4)Three-rooted variations were observed only in males, and there was a significant difference in the number of right roots between males and females(P=0.022).(5) According to Vertucci classification system, type I root canal was the most common(84.81%) in the studied samples, but type VI, VII and VIII root canal structures were not observed in this study. There was no significant difference in the distribution of root canals on the left and right sides of the teeth(P=0.524), not related to gender(P=0.452).(6) In summary, the understanding of the morphology and anatomy of the root canal system is one of the essential factors in the success of root canal therapy. Preoperative cone-beam CT examination can confirm the root canal morphology of mandibular first deciduous molars, which is helpful for clinicians in root canal therapy.
Pages: 4265-4268
Year: 2019 Issue: 27
Journal: Chinese Journal of Tissue Engineering Research
Keyword: cone beam computed tomography; mandibular first deciduous molars; roots; three-root anatomic variation; root canal structure;
Abstract: BACKGROUND: X-ray is an important method for the diagnosis and treatment of dental pulp disease, but the three-dimensional anatomical structure of periapical film was compressed into two-dimensional image, so the morphology and variability of root canal are hard to be confirmed with the limited X-ray information.OBJECTIVE: To evaluate the number of tooth roots, the morphology/distribution of the mandibular first deciduous molar in Chinese children by cone-beam computed tomography.METHODS: Cone-beam CT data of 97 children mandibular first deciduous molar were collected. The study was approved by the Ethics Committee of Hainan Provincial People’s Hospital, and the children guardians were informed of the study process and signed the informed consent. The roots and the root canals of 158 mandibular first deciduous molar were analyzed retrospectively. The sex, age, root number, and root canal number/structure were recorded. SPSS 19.0 software was used for statistical analysis.RESULTS AND CONCLUSION:(1) The sex ratio of the participants was about 1:1, and the age was(8.17±3.16) years.(2) Among 158 mandibular first deciduous molars examined, 68 were left molars, and 90 were right molars; 76 were from the male, and 82 were from the female.(3) According to the number of tooth roots, teeth were divided into single-rooted(89.24%), double-rooted(8.86%), and three-rooted(1.90%).(4)Three-rooted variations were observed only in males, and there was a significant difference in the number of right roots between males and females(P=0.022).(5) According to Vertucci classification system, type I root canal was the most common(84.81%) in the studied samples, but type VI, VII and VIII root canal structures were not observed in this study. There was no significant difference in the distribution of root canals on the left and right sides of the teeth(P=0.524), not related to gender(P=0.452).(6) In summary, the understanding of the morphology and anatomy of the root canal system is one of the essential factors in the success of root canal therapy. Preoperative cone-beam CT examination can confirm the root canal morphology of mandibular first deciduous molars, which is helpful for clinicians in root canal therapy.
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