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《WEST CHINA JOURNAL FOF STOMATOLOGY》 2000-04
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Three-dimensional Surface Reconstruction of Spiral CT for Teeth and Clinical Use in Examining Impacted Teeth of Jaws

Chen Songling, Lin Erjian, Ran Wei, et al\;Department of Stomatology, Sun Yat sen University of Medical Sciences\;  
Objective: To establish a new technique for three dimensional surface reconstruction of teeth (dental surface reconstruction), and apply it to investigate impacted teeth in bone before operation. Methods: On the basis of three dimensional surface reconstruction of teeth and jaws, the dental surface reconstruction is obtained with the technique of shaded surface display (SSD), making transparent bone around. This technique is applied to investigate 9 cases of supernumerary and impacted teeth. Results: Dental surface reconstruction image can present the dental surface image including crown, root, neck and root bifurcation in three dimensional way, without presenting the image of other tissue around. In 4 cases, the abnormal configuration, labial or palatal location, and relation with dentition in anterior maxilla of 5 supernumerary were shown. In 1 case, the shape, location, eruption orientation and the angle of orthodontic distraction of 1 impacted permanent canine were displayed. In 3 cases, the shape, location, and extraction resistance of 6 impacted wisdom teeth were revealed. In 1 case, the configuration, distance to adjacent molar of 1 impacted wisdom tooth, which is a transposition tooth in maxillary sinus, were also demonstrated. Conclusion: The dental surface reconstruction is a new technique to display three dimensional surface configuration of teeth. This technique can be applied to examine impacted and supernumerary teeth before surgical and orthodontic treatment.\;
【Fund】: 广东省科委研究基金!资助项目 (编号 970 16 )
【CateGory Index】: R814.4
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