A roentgenographic cephalometric analysis of the skeleto-facio-dental soft tissue relationships of Iranian children with normal occlusion
Kermani, Sorraya Elahi
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Cephalometric studies on different ethnic groups have indicated that there are measurable skeletal and dental differences when compared to the American Caucasian. The mean values of the measurements of one racial group cannot be considered normal when compared with others. Steiner and Downs lndicated that their norms (means) were to be used as guides, not as absolute values for every patient. The concept emphasized that in a normal range of measurement in a particular racial group, a variety of facial patterns exist. If this variety existed in any single racial group, what would be the possibility of individual differences between two or more racial groups. Since many studies have demonstrated differences between racial groups, each different racial group would have to be treated according to its individual characteristics. In this study, 60 individuals, composed of 30 boys and 30 girls between the ages of 11 to 15 with the mean age of 12.6 were selected for establishing the standard norm measurement of the skeleto-facio-dental and soft tissue structure in the Iranian children. Criteria for the selection of the sample was based mainly on the ethnic background and the geographic origin ie. the people who had immigrated from the north part of Iran. The criteria for selection of the sample was that they had normal occlusion (C1 I molar and cuspid relationship), minimum crowding or spacing in both arches, minimum overbite and overjet, and had no previous history of orthodontic treatment. Saggital Cephalograms, intra oral and extra oral photographs were taken. Mean, S.D., S.E. and range measurements of the Iranian children were established and compared with the mean measurement of the American Caucasian group. Cephalometric analysis were used to evaluate skeletofacial and dental patterns and Steiner's, Ricketts', Holdaway's and Merrifield's analysis were utilized for soft tissue evaluation. The results obtained in this study when compared to the American Caucasian norm, showed some objective differences, mostly in the mandible, being more retruded in the Iranian children than the American group. The upper and lower incisors were more protrusive in the Iranian group, but showed less overjet and overbite than the American Caucasian. These differences were also more consistent in the Iranian miles than the females. Tweed's Cephalometric analysis shows a slightly unfavorable facial pattern in Iranian children along with a slight deficiency in the vertical growth of the ramus of the mandible especially in Iranian males. In soft tissue analysis, we find that the Iranian children have more protrusive lips than the American Caucasian, especially the lower lip. The lower lip fullness is more obvious in Iranian males than females.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1979 (Oral biology, Research in orthodontics)Bibliography: leaves 63-67.
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