Analysis of mandibular canal in patients with prognathism and its clinical significance

doi:10.19439/j.sjos.2020.05.015

Abstract

Abstract: PURPOSE: The aim of this study was to investigate the position and course of mandibular canal in patients with prognathism using cone-beam CT(CBCT),and explore its clinical significance. METHODS: The mandibles of 28 patients with skeletal Class Ⅲ prognathism (10 males and 18 females) and 20 normal people(12 males and 8 females) were analyzed on CBCT. The position and course of mandibular canal from the lowest point of mandibular foramen to the first molar were measured at five specific sections from the mandibular foramen to the mandibular first molar area, including inner and outer diameter, mandibular bone thickness ,distance between mandibular canal and distance to the buccal and lingual bone cortex, and the inferior border of mandible bone. Statistical analysis was performed using SPSS 17.0 software package. RESULTS: The mandibular bones of patients with prognathism gradually thickened from the mandibular ramus to the forepart of the mandibular angle and thinned forward to the position where the mandibular first molar projected on the mandibular bone. Cortical bone of buccal side of the mandibular ramus thickened forward to the mandibular angle and thinned to the mandibular body. The width of buccal bone marrow cavity and diameter of mandibular bone were statistically different between genders. CONCLUSIONS: This study found that the difference between the thickness of the mandibular ramus in patients with mandibular protrusion from the controls was mainly due to the difference between the width of the buccal bone marrow cavity. CBCT can accurately locate the mandibular canal and display anatomic structures.

Key words: Mandibular canal, Cone-beam CT, Prognathism

CLC Number:

R782.1

YE Li-juan, BO Fang, LIU Jing, WANG Yue-ping. Analysis of mandibular canal in patients with prognathism and its clinical significance[J]. Shanghai Journal of Stomatology, 2020, 29(5): 524-527.

References

[1] 张震康. 正颌外科学[M]. 北京: 人民卫生出版社, 1994: 180-246.
[2] 周会喜, 艾伟健, 刘曙光, 等. 下颌支矢状劈开术同期行下颌角修整矫正下颌前突伴偏斜畸形[J]. 广东医学, 2013, 34(11): 1712-1713.
[3] 任晓旭, 牛勇梅, 秦晓中, 等. 正颌-正畸联合治疗下颌前突伴偏颌畸形患者的临床应用[J]. 临床口腔医学杂志, 2016, 32(1): 57-59.
[4] Hasegawa T, Tateishi C, Asano M, et al.Changes in the sensitivity of cutaneous points and the oral mucosa after intraoral vertical ramus osteotomy[J]. Int J Oral Maxillofac Surg, 2013, 42(11): 1454-1461.
[5] Levine JP, Patel A, Saadeh PB, et al.Computer-aided design and manufacturing in craniomaxillofacial surgery: the new state of the art[J]. J Craniofac Surg, 2012, 23(1): 288-293.
[6] Whitlock EL, Kasukurthi R, Yan Y, et al.Fibrin glue mitigates the learning curve of microneurosurgical repair[J]. Microsurgery, 2010, 30(3): 218-222.
[7] Peltola SM, Melchels FP, Grijpma DW, et al.A review of rapid prototyping techniques for tissue engineering purposes[J]. Ann Med, 2008, 40(4): 268-280.
[8] 马嘉, 阎秀林.双侧下颌支矢状劈开截骨术后咽腔气道的变化[J]. 中国口腔颌面外科杂志, 2015, 13(5): 425-428.
[9] Levine MH, Goddard AL, Dodson TB.Inferior alveolar nerve canal position: a clinical and radiographic study[J]. J Oral Maxillofac Surg, 2007, 65(3): 470-474.
[10] Kagawa T, Fukunari F, Shiraishi T.Development of a simple image viewer designed for small X-ray field CT equipment 3DX[J]. Oral Radiol, 2006, 22(2): 47-51.
[11] Lofthag-Hansen S, Huumonen S, Gröndahl K, et a1. Limited cone-beam CT and intraoral radiography for the diagnosis of periapical pathology[J]. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2007, 103(1): 114-119.
[12] 沈聪聪, 张艳, 李青峰, 等. 3-D打印技术制备人工骨修复下颌角截骨整形术后骨缺损[J]. 中国修复重建外科杂志,2014, 28(3): 300-303.
[13] Al-Bishri A, Barghash Z, Rosenquist J, et al.Neurosemory disturbance after sagittal split and intraoral vertical ramus osteotomy: as reported in questionnaires and patients' records[J] . Int J Oral Maxillofac Surg, 2005, 34(3): 247-251.
[14] Hueman EM, Noujeim ME, Langlais RP, et al.Accuracy of cone beam computed tomography in determining the location of the genial tubercle[J]. Otolaryngol Head Neck Surg, 2007,137(1): 115-118.
[15] Tsuji Y, Muto T, Kawalami J, et al.Computed tomographic analysis of the position and course of the mandibular canal: relevance to the sagittal split ramus osteotomy[J]. Int J Oral Maxillofac Surg, 2005, 34(3): 243-246.
[16] Ribeiro DP, Gandelmann IH, Medeiros PJ.Comparison of mandibular rami width in patients with prognathism and retrognathia[J]. J Oral Maxillofac Surg, 2006, 64(10): 1506-1509.
[17] Muto T, Shigeo K, Yamamoto K, et al.Computed tomography morphology of the mandibular ramus in prognathism: effect on the medial osteotomy of the sagittal split ramus osteotomy[J]. J Oral Maxillofac Surg, 2003, 61(1): 89-93.