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Background: Sex determination using dental features is primarily based upon the comparison of tooth dimensions in males and females. Aims and Objectives: To determine the role of inter-canine width in identification of sex of individuals. Methods: 50 subjects were included in the study. Impressions were taken with alginate and study models prepared. Inter canine width was measured in all the cases and findings tabulated. Results: Inter canine width for males were higher than females in both maxilla and mandible. Conclusion: Inter-canine widths can be used as a tool in sex determination.
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OBJECTIVE: The purpose of this study was to develop superimposition method on the lower arch using 3-dimensional (3D) cone beam computed tomography (CBCT) images and orthodontic 3D digital modeling. METHODS: Integrated 3D CBCT images were acquired by substituting the dental portion of 3D CBCT images with precise dental images of an orthodontic 3D digital model. Images were acquired before and after treatment. For the superimposition, 2 superimposition methods were designed. Surface superimposition was based on the basal bone structure of the mandible by surface-to-surface matching (best-fit method). Plane superimposition was based on anatomical structures (mental and lingual foramen). For the evaluation, 10 landmarks including teeth and anatomic structures were assigned, and 30 times of superimpositions and measurements were performed to determine the more reproducible and reliable method. RESULTS: All landmarks demonstrated that the surface superimposition method produced relatively more consistent coordinate values. The mean distances of measured landmarks values from the means were statistically significantly lower with the surface superimpositions method. CONCLUSIONS: Between the 2 superimposition methods designed for the evaluation of 3D changes in the lower arch, surface superimposition was the simpler, more reproducible, reliable method.
Subject(s)
Cone-Beam Computed Tomography , Dental Arch , Mandible , ToothABSTRACT
OBJECTIVE: This case report describes orthodontic treatment of contracted mandibular arch using a trombone appliance. METHODS: A 14-year-old girl with Class II division 2 malocclusion, retroclined maxillary incisors, and buccally displaced maxillary canines required dental expansion in 3 spatial directions to correct the contracted maxillary and mandibular arches. In the initial phase of treatment, the maxillary arch was expanded and distalized using a quad-helix appliance and cervical headgear. Following the expansion and leveling of the maxillary arch, a trombone appliance was used to expand the mandibular arch. On correction of the mandibular arch and provision of sufficient space to level the mandibular teeth, fixed orthodontic treatment phase was initiated. RESULTS: A trombone appliance proved effective in correcting the contracted mandibular arch. Because of labiolingual and transversal expansion, the mandibular dental arch perimeter was increased by 7.4 mm; the misalignment of the mandibular teeth was corrected successfully. CONCLUSIONS: A trombone appliance may serve as an appropriate clinical alternative for treating moderate mandibular arch crowding caused by the contraction of the dental arch.
Subject(s)
Adolescent , Humans , Contracts , Crowding , Dental Arch , Incisor , Malocclusion , ToothABSTRACT
0.05) respectively. The width of mandibular arch in the treated subjects increased more than that in the controls(P
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Objective To discuss the effect of the shape of mandibular arch on uprightness distortion ratio in computed orthopantomography.Methods 20 specimens of adult head with different shape of mandibular arch were selected.The computed orthopantomography was performed after the markers were inserted in the marking points of mandible,the length of the markers were measured with computer,and the results were statistically analysed.Results In computed orthopantomography,the uprightness distortion ratio of anterior teeth area of square mandibular arch(11.77%) was higher than that of tine mandibular arch(5.05%),and the difference was prominent(P=0.011