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Objective@#To evaluate the feasibility and outcome of computer assisted distraction osteogenesis in the treatment of extensive alveolar cleft.@*Methods@#Four patients [1 male and 3 females, aged (15.5±3.7) years] received treatment in the Department of Oral-Maxillofacial Surgery and Plastic Surgery, School of Stomatology, China Medical University from June 2016 to April 2018 were involved in this study. All the patients with extensive alveolar cleft [cleft width (7.64±1.29) mm] were performed orthodontic treatment to expand the dental arch and interdental space between the first molar and premolars. Three-dimensional (3D) model of the maxilla and the osteotomy guider were printed according to the CT data. The fix wings of the distractor were pre-shaped according to the 3D model. The osteotomy was performed at the interdental space and horizontal plate of palate to dissociate the alveolar bone segment. The distractor was fixed on the predetermined position. Distraction (0.4-0.8 mm/day) was performed in 7 days later and stopped when the incision connected with the canine. The distractor was removed after six months.@*Results@#The distraction period was (10.8±2.5) d in four cases. The cleft was completely closed with interdental bone anchored distraction in four cases. The imaging examination in six months showed good new bone structure in the distraction zone and bone connection of the cleft.@*Conclusions@#Computer assisted distraction osteogenesis was effective and feasible to close the extensive alveolar cleft and provide sufficient new bone tissue.
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Objective To evaluate the clinical effect of alveolar bone augmentation by applying autogenous tooth bone graft material to patients with alveolar bone deficiency in orthodontic treatment. Methods Four patients with a stable periodontal condition managed with fixed orthodontic treatment were included, and the number of graft sites was 17. Cone beam computed tomography (CBCT) showed labial alveolar bone deficiency. The treatment plan included extraction, and the extracted teeth were used to prepare autogenous tooth bone material. The alveolar bone width was measured at the same site at multiple heights prior to operation and at 3 and 6 months post-operation.Results The alveolar bone width was higher at both 3 and 6 months post-operatively (P ＜ 0.05) than that pre-operatively. The alveolar bone width at 6 months post-operation was lower than that at 3 months post-operation (P ＜ 0.05). Conclusion Applying autogenous tooth bone graft material to patients with alveolar bone deficiency in orthodontic treatment can expand the range of tooth movement and result in good clinical outcomes.
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Objective To characterize differences within facial profile esthetic evaluations among three groups of evaluators and the influences of sagittal or vertical skeletal patterns on facial profile esthetics. Methods A total of 114 silhouettes,from the pre?or post?treatment facial profiles of 57 patients,were scored by three groups of evaluators(professionals,patients'parents,and laypersons)to characterize differences within facial es?thetics evaluation among evaluators. The highest?scoring 30 silhouettes and the lowest?scoring 30 silhouettes were selected as the high score group and the low score group,respectively. Sixteen indices of the relative lateral cephalometric films were measured. Data were analyzed by SPSS 21.0. Results Facial profiles following orthodontic treatment scored higher than pre?treatment(P<0.05). There were significant differences between professionals and laypersons in facial profile scoring. Different sagittal skeletal patterns had no effect on esthetic evaluation ,but lower facial height significantly influenced whether a patient received a high or low esthetic score(P<0.05). Conclusion Orthodontic treatment can improve the fa?cial profile significantly,and lower facial height is the most sensitive index for facial profile evaluation in our study. However,all three evaluator groups have different esthetic standards that don't overlap. Notably,the expectations of laymen are higher than those of orthodontists.
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Objective:To choose some cephalometric variables for early predicting curative effects of facial mask.Methods:Sixty five patients in success group and eight patients in failure group were chosen,whose cephalograms taken in the mixed dentition were available.The cephalograms were measured,the indexes were analyzed and discriminant equation was established.Results:The mean value of ANB was(-1.82?2.11)? in success group and(-4.61?3.26)? in failure group(P0,failure in early treatment need more comprehensive treatment project.