Measurement and analysis of the labial and palatal bone thickness of the maxillary anterior (esthetic zone) teeth in Chinese adults with individual normal occlusion

Abstract

Abstract: PURPOSE: To measure and analyze the labial and palatal bone thickness of the maxillary anterior (esthetic zone) teeth in Chinese adults with individual normal occlusion, in order to lay a foundation for database and to provide data support and references for preoperative analysis and plan making of implant surgery, especially immediate implantation. METHODS: Sixty subjects who met the inclusion criteria were scanned by KaVo 3D eXam CBCT(cone-beam computed tomography). The three-dimensional reconstruction CBCT data in a Dicom (digital imaging and communication in medicine)format were imported to InVivo 5 software. The data obtained from the measurement of the labial and palatal bone thickness on reference lines (which were perpendicular to tooth long axis) L3, L6, L9, L12 were statistically analyzed with 95% reference range, frequency, paired sample t test, independent sample t test, ANOVA (analysis of variance)and multiple comparison using SPSS 18.0 software package. RESULTS: The data showed that the mean labial bone thicknesses were less than the corresponding palatal bone on every reference line of each tooth (P<0.05), bone absence or thickness less than 1 mm often occurred at the labial bone (40.6%~93.1%), the palatal bone thicknesses were generally more than 2 mm (L6 and upper levels: 60%~100%), and there were diversities of bone thickness between left and right teeth, labial and palatal plate, gender, ages, different teeth positions at same reference line, and different reference lines at same tooth position. CONCLUSIONS: Bone is often insufficient at the maxillary anterior teeth when implanting, particularly at the lateral incisors. The labial bone plates are thinner than the palatal bone and frequently exhibit depression. In order to ensure intact labial bone wall and enough bone thickness, the implants should be placed appropriately palatally after measuring and analyzing with CBCT. Moreover, the bone substitute materials, bone splitting and bone augmentation technique should be applied when necessary.

Key words: Oral implant, Cone-beam CT, Maxillary anterior teeth, Bone thickness

CLC Number:

R782.13

GUO Peng-nv, GUO Hua-yan, ZHONG Hua-xing, HUANG Lan, CHEN Wei-dong, ZHANG Ying-di, HUANG Yuan-liang. Measurement and analysis of the labial and palatal bone thickness of the maxillary anterior (esthetic zone) teeth in Chinese adults with individual normal occlusion[J]. China Journal of Oral and Maxillofacial Surgery, 2016, 14(4): 337-343.

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