The analysis of alveolar bone condition around mandibular incisors in adults with skeletal Class Ⅲmalocclusion by CT / 实用医学杂志

ABSTRACT

Objective To study the mandibular anterior alveolar morphological characteristics of skeletal ClassⅢmalocclusion patients by CT quantitative research , which can provide guidances and indications for clinical skeletal Class Ⅲmalocclusion treatment and prevent iatrogenic complications , such as rootabsorption. Method 25 skeletal Class Ⅲ malocclusion patients during thepostpubertal were selected , three-dimensionalspiralCTscanning was applied to measure cortical and cancellousbonethickness around 6 mandibular incisors for analyzing the relationship between the bone mass and its anatomyaround the mandibular incisors roots. Results (1) The bone thickness around the lower anterior homonym teeth was basically symmetric in the skeletal Class III malocclusion. The labial thickness is a little less than the lingual side , gradually thickening along the root apical direction; (2) The area of mandibular incisors was inhomogeneous , and the 1/2 regional cancellous bone thickness of mandibular incisors was often lacked. Conclusion (1) The synchronous compensation of the teeth and alveolar bone is the significant feature of the skeletal Class Ⅲ malocclusion. (2) The responding regions ofthe alveolar bone in the 1/3 labial-cervical and root-tip may be the sensitive areas during the orthodontic treatment.