A CBCT Study on the Anatomical Position of Mandibular Accessory Foramen for Adults in Xinjiang
Objective To retrospectively study the anatomic position of accessory foramen of mandible in Uygur and Han adults in Xinjiang by cone beam CT,and provide theoretical reference for clinical operation.Methods The CBCT images of 300 Uigur and Han adults who visited the Department of Stomatology of the Fifth Affiliated Hospital of Xinjiang Medical University from January 2020 to December 2021 were chosen.According to the mandibular division,the corresponding position,diameter and distance to the alveolar crest of each accessory foramen were obtained,and the relationship between sex,ethnicity,age and the occurrence of accessory foramen was analyzed.Results A total of 1 361 accessory foramen were found in the images of 300 adults,including 686 Uighurs and 675 Han Chinese.The incidence of accessory foramen was 100%,(4.54±1.58)per capita.The incidence of accessory foramen was the highest in the anterior lingual region,with 85.7% in Uygur and 81.9% in Han.There was no significant difference between the incidence of accessory foramen and gender,ethnicity and age.The diameter of accessory foramen was(0.79±0.23)mm in Uygur and(0.70±0.19)mm in Han.The diameter of accessory foramen≥1 mm accounted for 15.74% in Uygur and 13.48% in Han nationality,with statistical difference(P<0.001).The distance from accessory foramen to alveolar crest was(12.65±9.35)mm in Uygur and(13.15±8.01)mm in Han,with no statistical difference(P=0.058).In the lingual anterior region with high incidence of accessory foramen,there were significant differences between supra and infra chin ridges(P<0.05).Conclusion Most adults in XinJiang have mandibular accessory foramen.CBCT images should be carefully read before operation to avoid injury of accessory foramen structure and reduce complications.