Shape of Gubernacular Canals in Relation to Impaction of Mandibular Third Molars Assessed by CBCT

doi:10.13701/j.cnki.kqyxyj.2020.09.006

Abstract

Abstract: Objective: To evaluate the shape of gubernacular canals (GCs) and its relation to impaction of mandibular third molars by CBCT. Methods: 76 CBCT image data of mandibular third molars were included. The long diameter, short diameter, ratio of them, and angulation of GCs to tooth axis were measured and analyzed. Results: There was no statistical difference in long diameter, short diameter, and ratio of them between the groups. The angulation of GCs to tooth axis: normal eruption > mesioangular impaction > horizontal impaction. The long diameter, short diameter, and angulation of GCs to tooth axis were related to the age in mandibular third molars. Conclusion: CBCT can accurately measure the shape of GCs. The angulation of GCs to tooth axis differs in mandibular third molars with different impactions. The absence of GCs, and/or an abnormal angle to the long axis of the tooth may suggest the abnormal eruption.

Key words: cone-beam computed tomography, mandibular third molar, gubernacular canal, impaction

LIU Pei, WANG Fang, LI Bo, WEI Lili, CHENG Yong. Shape of Gubernacular Canals in Relation to Impaction of Mandibular Third Molars Assessed by CBCT[J]. Journal of Oral Science Research, 2020, 36(9): 821-824.

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