Author(s):
Pereira, Pedro Mariano 
; Ferreira, Afonso Pinhão ; Tavares, Purificação ; Braga, Ana Cristina
Date: 2013
Origin: Repositório Comum
Subject(s): Class II Division 2; Incisor retroclination
Document details
Different manifestations of Class II Division 2 incisor retroclination – Morpho...
Description
"Introduction: The aim of the present study was to investigate whether there is a different transverse morphologic pattern of dental arches among the different manifestations of Class II Division 2 incisor retroclination and evaluate to what extent the pattern of smaller-than-average teeth in Class II Division 2 malocclusion is common to all groups studied. This information may clarify whether different Class II Division 2 phenotypes represent a single etiology or multiple etiologies. Methods: The sample comprised 108 Class II Division 2 malocclusions which were divided into two groups according to the type of incisor retroclination: Group I composed of 43 Class II Division 2 with retroclination exclusively of the maxillary central incisors; Group II composed of 65 Class II Division 2 with retroclination of the four maxillary incisors. Maxillary and mandibular intercanine and intermolar widths as well as the mesiodistal crown dimension of the four maxillary and mandibular incisors were determined using the initial study models of patients. Mean values of all variables were compared between the two groups by gender using ANOVA. Results: From the comparison between the two groups analyzed, no statistically significant differences were found for all transverse measurements (p>0.05). For all mesiodistal measurements analyzed, statistically significant differences between the groups were only found for the mean value of both maxillary lateral incisors mesiodistal dimension in both sexes (p<0.05). Conclusions: It is not possible to attribute a characteristic pattern of dental arch width and of incisor mesiodistal dimension to the different manifestations of incisor retroclination in Class II Division 2 malocclusion."
"Introduction: The aim of the present study was to investigate whether there is a different transverse morphologic pattern of dental arches among the different manifestations of Class II Division 2 incisor retroclination and evaluate to what extent the pattern of smaller-than-average teeth in Class II Division 2 malocclusion is common to all groups studied. This information may clarify whether different Class II Division 2 phenotypes represent a single etiology or multiple etiologies. Methods: The sample comprised 108 Class II Division 2 malocclusions which were divided into two groups according to the type of incisor retroclination: Group I composed of 43 Class II Division 2 with retroclination exclusively of the maxillary central incisors; Group II composed of 65 Class II Division 2 with retroclination of the four maxillary incisors. Maxillary and mandibular intercanine and intermolar widths as well as the mesiodistal crown dimension of the four maxillary and mandibular incisors were determined using the initial study models of patients. Mean values of all variables were compared between the two groups by gender using ANOVA. Results: From the comparison between the two groups analyzed, no statistically significant differences were found for all transverse measurements (p>0.05). For all mesiodistal measurements analyzed, statistically significant differences between the groups were only found for the mean value of both maxillary lateral incisors mesiodistal dimension in both sexes (p<0.05). Conclusions: It is not possible to attribute a characteristic pattern of dental arch width and of incisor mesiodistal dimension to the different manifestations of incisor retroclination in Class II Division 2 malocclusion."
Document Type
Article
Language English
Language English
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