Abstract: Objective We aimed to determine the thickness of the labial plate in the esthetic area and functional area of normal occlusion and use CBCT technology to establish an image database of healthy young people in northeast China, providing a clinical reference for immediate implant placement. Methods Sirona, SL 3D (CBCT) technology was used to scan 200 young people. The best sagittal planes of 100 people were randomly selected for the measurement. The vertical distances of cemento-enamel junction (CEJ) square 4 mm (F₁), middle root (F₂), and apical (F₃) between the labial plate and the long axis of maxillary central incisors, lateral incisors, canines, first premolars, and second premolars were statistically analyzed by SPSS22.0. Results The labial thickness of the central incisor ranged from 0.5 mm to 0.75 mm, accounting for 34.5% and 27.5%. The labial thickness of canine and premolar ranged from 1.0 mm to 1.5 mm, especially for the canine, reaching 43.5%. The labial bone zone thickness of central incisors, lateral incisors, and canine at F₁ was significantly lower than that of F₃ (P<0.05), There were significant differences in the thickness of bone site at the three sites of different genders (P<0.05), and only the F₃ site of the central incisors and the second premolars had statistical differences between males and females (P<0.05). Conclusion The thickness of maxillary anterior teeth and labial bone wall of normal occlusion people in northern China ranged from 0.5 mm to 0.75 mm, and the anatomical structure of labial (buccal) bone was different in different tooth positions. The statistical difference of data was of clinical significance for immediate implant placement in anterior and functional areas.

Key words: CBCT, Labial plate thickness, Esthetic zone, Immediate implant placement