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Ângulo corono-radicular incisivo nas diferentes formas de manifestação da retroinclinação incisiva superior na classe II divisão 2 : estudo comparativo
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Abstract(s)
Objetivo: O objetivo deste estudo foi comparar o ângulo corono-radicular do incisivo central superior nas diferentes formas de manifestação da retroinclinação incisiva superior na Classe II divisão 2.
Materiais e Métodos: A amostra (n=85) foi dividida em 2 grupos, o Grupo A correspondente aos indivíduos portadores de má oclusão Classe II divisão 2, com retroinclinação coronária exclusiva dos incisivos centrais superiores, e o Grupo B, constituído por indivíduos portadores de má oclusão Classe II divisão 2, com
retroinclinação coronária de quatro a seis peças dentárias ântero-superiores. Foi comparado o ângulo corono-radicular entre os dois grupos. O ângulo corono-radicular determinou-se, em telerradiografias em norma lateral, através da interseção entre o longo eixo da raiz e do longo eixo da coroa, sendo que o longo eixo da raiz é determinado pela linha que une o ápex da raiz com o ponto médio da linha que une a junção amelocementária vestibular e labial, e o longo eixo da coroa definido pela linha que une o ponto mais incisal do incisivo central superior com o ponto médio da linha que une a junção amelocementária vestibular e lingual. Na análise estatística foi utilizado o teste t-student para um nível de significância p≤0,05.
Resultados: O ângulo corono-radicular apresentou um valor médio de 175,7o no Grupo A e de 173,9o no Grupo B. Os valores médios para o ângulo corono-radicular nas diferentes formas de manifestação da retroinclinação incisiva superior na CII/2 não apresentam diferenças estatisticamente significativas (p=0,154).
Conclusão: Não se verificaram diferenças no ângulo corono-radicular do incisivo central superior entre a forma de Classe II divisão 2 com retroinclinação exclusiva dos incisivos centrais superiores e a forma com retroinclinação de quatro a seis peças dentárias antero-superiores.
Objective: The aim of this study was to compare the crown-root angle of the maxillary central incisor in the different manifestations of maxillary incisor retroclination in Class II division 2. Materials and Methods: The sample (n=85) was divided into 2 groups, Group A corresponding to Class II division 2 malocclusion carriers with exclusive coronary retroclination of the two upper central incisors, and Group B, consisting of Class II division 2 malocclusion carriers, with retroclination of four to six anterior upper teeth. The crown-root angle was compared between the two groups and was determined, in lateral teleradiography, through the intersection between the long axis of the root and the long axis of the crown. The long axis of the root is determined by the line that joins the root apex with the midpoint of the line joining the buccal and labial cementoenamel junction, and the long axis of the crown is defined by the line joining the most incisal point of the maxillary central incisor with the midpoint of the line joining the buccal and lingual cementoenamel junction. In the statistical analysis, the t-student test was used for a significance level of p≤0.05. Results: The crown-root angle showed an average value of 175.7o in Group A and 173.9o in Group B. No statistically significant differences were detected between the two groups (p=0.154). Conclusion: There were no differences in the crown-root angle of the maxillary central incisor between the Class II division 2 form with exclusive retroclination of the maxillary central incisors and the form with retroclination of four to six anterior upper teeth.
Objective: The aim of this study was to compare the crown-root angle of the maxillary central incisor in the different manifestations of maxillary incisor retroclination in Class II division 2. Materials and Methods: The sample (n=85) was divided into 2 groups, Group A corresponding to Class II division 2 malocclusion carriers with exclusive coronary retroclination of the two upper central incisors, and Group B, consisting of Class II division 2 malocclusion carriers, with retroclination of four to six anterior upper teeth. The crown-root angle was compared between the two groups and was determined, in lateral teleradiography, through the intersection between the long axis of the root and the long axis of the crown. The long axis of the root is determined by the line that joins the root apex with the midpoint of the line joining the buccal and labial cementoenamel junction, and the long axis of the crown is defined by the line joining the most incisal point of the maxillary central incisor with the midpoint of the line joining the buccal and lingual cementoenamel junction. In the statistical analysis, the t-student test was used for a significance level of p≤0.05. Results: The crown-root angle showed an average value of 175.7o in Group A and 173.9o in Group B. No statistically significant differences were detected between the two groups (p=0.154). Conclusion: There were no differences in the crown-root angle of the maxillary central incisor between the Class II division 2 form with exclusive retroclination of the maxillary central incisors and the form with retroclination of four to six anterior upper teeth.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Classe II divisão 2 Retroinclinação incisiva Ângulo corono-radicular Ângulo collum