Title: THE VARIATION AND CHANGES OF ARCH DIMENSIONS AND AREA BETWEEN NORMAL GIRLS AND BOYS (A LONGITUDINAL STUDY IN QAZVIN-IRAN)
Abstract: Purpose: Transition of dentition from late mixed dentition to early permanent stage has an impact on dental arch length, circumference also width and depth of arch. Recognition of these changes and prediction of it's pattern is important in treatment planning especially because there are differences between genders that should be considered. This study was designed to evaluate the variations between Iranian(residence of Qazvin city) normal girls and boys in arch dimensions and area. Materials & Methods: This was a longitudinal descriptive study on 26 normal occlusion adolescents with mean age of 12±1 years at the commencement and 16±1 years at the end of study (12 girls & 14 boys). The individuals had normal occlusion defined by Moyers. Study casts were taken from the sample during 1998 and 2002 respectively. The casts were trimmed according to Profitt. Two photographs were taken from the occlusal view of each with 20 cm distance and vertical to it's midline. After superimposition of the two dental arches on the midline and registration on best fit of incisal edges and mesiobuccal cusp of first molar, changes of depth and width at molar and canine regions were calculated based on genders. Variations in the shape and area of the dental arch were also studied. Mean, SD and confidence interval of the landmarks in each sex was calculated and compared for differences by means of t test. Results: The size and area of arch was always larger in boys and this difference increased by age. In maxilla and mandible, molar width increased in boys but decreased in girls. In maxilla, reduction of canine depth was seen only in boys. Conclusion: There are significant differences between normal arch dimension and area between boys and girls that should be considered in treatment planning.
Publication Year: 2005
Publication Date: 2005-03-15
Language: en
Type: article
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Cited By Count: 2
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