Measurement Of Dental Cast With Normal Occlusion In Chongqing By Laser Scanning And Three-dimensional Reconstruction

ObjectiveTo obtain the morphological characters of normal occlusion inChongqing with the purpose of providing evidence for individual treatmentsystem, and to study the discrimination in tooth profile of different races andvarious areas, through comparing the datas of this study with those ofAndrews’, other domestic researchers’ and Ormco lingual brackets.MethodsForty-five casts of non-orthodontic subjects (21males and24females)with normal occlusion were examined using the ATOS3D lasing scannersystem. Then, the data of digital3D dental casts, including crown angulation,inclination, facial prominence and offset angle of molars both of labial andlingual surfaces of the teeth was calculated and analyzed statistically bycomputer-aided system.ResultsChongqing people had their own ethnic characteristics in normalocclusion:①the crown angulation of the upper incisors and canines were more upright, while the premolars and molars were medially more inclinedcompared with Caucasian.②the upper incisors were inclined more to thelabial side, while the upper molars to the lingual side, but the inclinationwere smaller than that of domestic researchers’ study.③the facialprominence of molars was larger than that of Caucasian and the facialprominence of canines was larger than domestic researchers’ study.④theoffset angle of upper first molars was smaller, but was similar to that ofdomestic researchers’ study.ConclusionTooth profile in Chongqing was significantly different from that ofCaucasian and domestic residents and had their own characteristics. Theresult can not only provide evidence for straight wire technique and lingualtherapy, but also help our clinicians to assess the craniofacial malformationcompletely and objectively for diagnosis and plan individual treatment forpatients from different races and various area.