INTRODUCTION: The mandibular arch form at the levels of both the application point of the orthodontic bracket and the basal bone in adults and children with Class I malocclusion and Class II Division 1 malocclusion was investigated. METHODS: One hundred thirteen pretreatment mandibular casts were scanned to generate a 3-dimensional computer model of each cast. The casts were divided into Class I and Class II Division 1 malocclusion groups, and were further divided into adults (age, > or =25 years) and children (age, < or =18 years). Two reference points, FA and WALA, were assigned for each tooth. The FA and WALA arch forms were compared, and the distances between corresponding points and intercanine and intermolar widths were analyzed. RESULTS: The mandibular intercanine FA point widths were significantly greater in the Class II Division 1 malocclusion group than in the Class I malocclusion group (P <0.05) and were also significantly greater in the Class I adults than in the Class I children (P <0.05). Both the canine FA and WALA point distances and the molar FA and WALA point distances were moderately to highly correlated (R(2) >0.55) and highly significant (P <0.001) for all groups. The FA and WALA curves for all groups had individual differences, especially in the premolar and molar areas. CONCLUSIONS: The Class II Division 1 mandible is essentially the same as the Class I mandible with respect to basal bone and dental arch dimensions. WALA points can be used to predict individual dental arch forms in adults and children. Dental and basal arch forms were not significantly different between adolescents and adults. Copyright (c) 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
INTRODUCTION: The mandibular arch form at the levels of both the application point of the orthodontic bracket and the basal bone in adults and children with Class I malocclusion and Class II Division 1 malocclusion was investigated. METHODS: One hundred thirteen pretreatment mandibular casts were scanned to generate a 3-dimensional computer model of each cast. The casts were divided into Class I and Class II Division 1 malocclusion groups, and were further divided into adults (age, > or =25 years) and children (age, < or =18 years). Two reference points, FA and WALA, were assigned for each tooth. The FA and WALA arch forms were compared, and the distances between corresponding points and intercanine and intermolar widths were analyzed. RESULTS: The mandibular intercanine FA point widths were significantly greater in the Class II Division 1 malocclusion group than in the Class I malocclusion group (P <0.05) and were also significantly greater in the Class I adults than in the Class I children (P <0.05). Both the canine FA and WALA point distances and the molar FA and WALA point distances were moderately to highly correlated (R(2) >0.55) and highly significant (P <0.001) for all groups. The FA and WALA curves for all groups had individual differences, especially in the premolar and molar areas. CONCLUSIONS: The Class II Division 1 mandible is essentially the same as the Class I mandible with respect to basal bone and dental arch dimensions. WALA points can be used to predict individual dental arch forms in adults and children. Dental and basal arch forms were not significantly different between adolescents and adults. Copyright (c) 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Authors: Aaron M Crossley; Phillip M Campbell; Larry P Tadlock; Emet Schneiderman; Peter H Buschang Journal: Angle Orthod Date: 2019-09-24 Impact factor: 2.079
Authors: R Mahalakshmi; M M Varadharaja; Reshmi Leila Ninan; V Vignesh Kumar; B Kanagasabapathy; M D Saravana Balaji Journal: J Pharm Bioallied Sci Date: 2021-06-05