Clinical study on three-dimensional anatomical position relationship of adult skeletal class Ⅱ maxillary central incisors
Objective:To study the root morphology,alveolar bone morphology,tooth canal and root position characteristics of maxillary central incisor in adult patients with skeletal classⅡ malocclusion by using cone beam computed tomography(CBCT),and to provide some theoretical reference for the correction of adult skeletal classⅡ malocclusion.Methods:A total of 50 adult orthodontic patients were included in this study(25 patients with skeletal class Ⅱ and angle Ⅱ1and 25 patients with skeletal classⅠ and angle Ⅰ),the relevant data of maxillary central incisor root-crown ratio,alveolar bone morphology,incisor canal and root position of maxillary central incisor were measured and analyzed by software.Results:The root-crown ratio of skeletal classⅡ maxillary central incisors was lower than that of skeletal classⅠpatients,and the difference was statistically significant(P<0.05.The total alveolar bone thickness of maxillary central incisor root cusp was thinner than that of skeletal classⅠ patients,and the difference was statistically significant(P<0.05).In the root apex level of the maxillary central incisors(R)and the palatal opening level of the incisal canal(I),the width of the incisal crown was larger than the root distance,and the width of the incisal foramina in skeletal class Ⅱ was wider than that in skeletal classⅠ,with the statistical significance(P<0.05).At I plane and R plane,the distances from the mesial margin of the maxillary central incisor to the incisor canal in skeletal class Ⅱ patients were(3.88±1.10)and(3.89±1.12)mm respectively,which were smaller than the mean values of skeletal classⅠ patients,but there was no statistical difference(P>0.05).Conclusion:It is necessary to evaluate the three-dimensional anatomical morphology and position of the maxillary central incisor region in the clinical treatment of adult patients of class II bone with masked orthodontic extraction.
root to crownincisive canalalveolar bone thicknessskeletal classⅡ
万方数据
维普
