关键词: 上前牙区,  ,  , CBCT,  ,  , 解剖,  ,  , 骨壁厚度

Abstract: Objective    To have a better understanding of the anatomical factors related to the anterior dental implants through measurement and analysis  of CBCT images of 400 adult anterior dental regions, , so as to provide reference for implant in aesthetic.    Methods   CBCT images of 400 patients were selected and enrolled in this study. The bone thickness at different sites of the labial and palate were measured and the positional relationship between the root of the upper anterior teeth and the alveolar bone was explored.  Results    The labial bone wall thickness was thicker at the apex of the root, thinner at 2 mm below the crest of the labial alveolar side and the thinnest at 1/2 the mid- root. The percentage of bone wall thickness > the proportion of 1mm in the in central incisor teeth to cuspid teeth  was 37%, 30%; 31%, 27%; and 56%, 34%, respectively. The thickness of palatal bone showed an increasing tend from the crest of alveolar to the root. The proportion of root bone mass > the proportion of 5 mm in the in central incisor teeth to cuspid teeth  was 94%, 82% and 97%, respectively. The position relationship of central incisor teeth, cuspid teeth and alveolar bone was classified as Type Ⅰ, Ⅱ, Ⅲ and Ⅳ. Type Ⅰ, Ⅱ, Ⅲ and Ⅳ were 79.5%, 10.5%, 1.0%, 2.0%; 72.0%, 14.5%, 3.0%, 5.0%; 83.0%, 5.5%, 0.0%, 0.5%, respectively. Subtype I: (it was difficult to distinguish the thickness of the labial bone plate in the accuracy images) the proportion of each tooth position was 7.0%, 5.5%, 11.0%, respectively.    Conclusions    The thickness of bone plate at the crest of labial alveloar and the mid-root of anterior dental area is generally thin, and the thickness of alveolar bone in most sites was less than 1mm. The labial bone wall thickness in the mid-root is the minimum. The palatal bone wall thickness showed an increasing tend from the crest of alveolar to the root. The position relationship between maxillary anterior root and alveolar bone is mostly type I, which provides a favorable anatomical position for immediate implantation in the aesthetic area, but the location of subtype I, due to the thin labial bone wall and possible defect, suggesting that more consideration should be given to the way of bone grafting before implantation. 

Key words: Anterior dental region,  ,  , Cone Beam CT,  ,  ,  , Anatomy,  ,  , Bone wall thickness