Prevalence and Characteristics of Fused Root at Maxillary Second Molars in Southern Fujian Population by Cone-beam Computed Tomography

doi:10.13701/j.cnki.kqyxyj.2021.09.017

Abstract

Abstract: Objective: To analyze the distribution of fused maxillary second molars in southern Fujian and the characteristics of root canal variation using CBCT scanning. Methods: CBCT images of 353 maxillary second molars from 191 patients were randomly selected to analyze the prevalence of fused roots and root canals, the types of fused roots, and their symmetry. Results: Maxillary second molar root fusion rate was 36.3%, of which type Ⅰ was the highest (25%), followed by type Ⅳ (22.6%), and type Ⅲ the lowest (1.6%). Within fused rooted teeth, the presence of merged canals was 69.5%, the prevalence of type Ⅶ was 100%, followed by type Ⅵ (90.5%), and the lowest prevalence was 22.2%. There were no statistically significant differences between sexes on fused rooted maxillary second molars, merged canals, C-shaped canals, and symmetrical distribution of the fused root(P>0.05). However, there were statistically significant differences in the proportion of root canal fusion in different age groups(P<0.05). The prevalence of root canal fusion was related to age. Conclusion: The prevalence of root fusion and root canal fusion in maxillary second molars is high, and the anatomical variations in the root canal are many, which should be cautious in the clinical operation.

Key words: maxillary second molars, fused root, variation root canal, cone-beam computed tomography

XIANG Yan, YANG Lvli, LIN Yao. Prevalence and Characteristics of Fused Root at Maxillary Second Molars in Southern Fujian Population by Cone-beam Computed Tomography[J]. Journal of Oral Science Research, 2021, 37(9): 850-854.

References

[1] McClammy TV. Endodontic applications of cone beam computed tomography [J]. Dent Clin, 2014, 58(3):545-559.
[2] Zhang Q, Chen H, Fan B, et al. Root and root canal morphology in maxillary second molar with fused root from a native Chinese population [J]. J Endod, 2014, 40(6):871-875.
[3] Mashyakhy M, Chourasia HR, Jabali A, et al. Analysis of fused rooted maxillary first and second molars with merged and C-shaped canal configurations: prevalence, characteristics, and correlations in a saudi Arabian population [J]. J Endod, 2019, 45 (10):1209-1218.
[4] Vertucci FJ. Root canal morphology and its relationship to endodontic procedures[J]. Endod Topics, 2005, 10(1):3-29.
[5] Al-Qudah AA, Awawdeh LA. Root and canal morphology of mandibular first and second molar teeth in a Jordanian population [J]. Int Endod J, 2009, 42(9):775-784.
[6] 杨绿丽,沈斯特,陈晓玲,等.下颌第一前磨牙C形牙根根面沟及根管分型的CBCT研究[J].口腔医学研究,2020,36(9): 830-834.
[7] 黎祺,黄少宏.岭南地区广府民系人群上颌第二恒磨牙牙根和根管形态的CBCT研究[J].口腔疾病防治,2019,27(6):381-386.
[8] 陈灏,范兵.上颌第二磨牙近颊融合根中MB2的锥束CT研究[J].口腔医学研究,2012,28(4):313-315.
[9] 卢冠凡,闵艺,韩琦,等.中国北方地区人群上颌第二磨牙融合根锥形束CT研究[J].口腔医学研究,2018,34(11):1177-1181.
[10] Martins JN, Mata A, Marques D, et al. Prevalence of root fusions and main root canal merging in human upper and lower molars: A cone-beam computed tomography in vivo study [J]. J Endod, 2016, 42(6):900-908.
[11] Kim Y, Lee SJ, Woo J. Morphology of maxillary first and second molars analyzed by cone-beam computed tomography in a Korean population: variations in the number of roots and canals and the incidence of fusion [J]. J Endod, 2012, 38(8):1063-1068.
[12] Zapata RO, Martins JN, Bramante CM, et al. Morphological evaluation of maxillary second molars with fused roots: a micro-CT study [J]. Int Endod J, 2017, 50(12):1192-1200.
[13] Fan W, Fan B, Gutmann JL, et al. Identification of a C-shaped canal system in mandibular second molars-part Ⅲ: Anatomic features revealed by digital subtraction radiography [J]. J Endod, 2008, 34(10):1187-1190.
[14] Zheng Q, Zhang L, Zhou X, et al. C-shaped root canal system in mandibular second molars in a Chinese population evaluated by cone-beam computed tomography [J]. Int Endod J, 2011, 44(9):857-862.
[15] Mercedes PH, Carmen MF, Manuel B, et al. Cone-beam computed tomographic study of root anatomy and canal configuration of molars in a Spanish population [J]. J Endod, 2017, 43(9):1511-1516.