Mandibular posterior space in class II division 1 and 2 malocclusion in various age groups.
J Orofac Orthop
; 81(4): 249-257, 2020 Jul.
Article
em En
| MEDLINE
| ID: mdl-32435863
ABSTRACT
PURPOSE:
The aim of this study was to compare the mandibular posterior space in subjects with skeletal class II division 1 and division 2 malocclusions in two different age groups.METHODS:
Pretreatment cephalometric radiographs of 160 patients from 9 to 13 years of age (nâ¯= 80) and 15 to 18 years of age (nâ¯= 80) with class II division 1 or division 2 malocclusion were used for the study. Equal numbers of male and female patients (nâ¯= 20) were included in the two age groups in each of the malocclusion groups. Eight linear and six angular measurements were taken for mandibular posterior space evaluation. The data obtained from the study were compared using the independent t-test.RESULTS:
In the present study, the mandibular posterior space was greater in both malocclusion groups in subjects aged 15-18 years than in those aged 9-13 years (pâ¯< 0.05). The available posterior spaces behind the mandibular first molars were 4.4â¯mm and 6.3â¯mm in females (class II divisions 1 and 2, respectively) and 5.3â¯mm and 7â¯mm in males (class II divisions 1 and 2, respectively) in the 9 to 13-year-old age group. This space increased significantly by 6.9â¯mm (pâ¯< 0.001) and 3.2â¯mm (pâ¯< 0.01) in females (class II division 1 and 2, respectively) and 3.8â¯mm (pâ¯< 0.01) and 3â¯mm (pâ¯< 0.01) in males (class II division 1 and 2, respectively) in the 15- to 18-year-old age group.CONCLUSION:
Class II division 1 and division 2 malocclusions had similar and inadequate posterior space dimensions for the eruption of the third and an unknown portion of the second molars.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Má Oclusão
/
Má Oclusão Classe II de Angle
Limite:
Adolescent
/
Child
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Female
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Humans
/
Male
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article