Original scientific paper
Evalution of the Level of the Position of Canine and Premolar Germs in Mixed Dentition
Mirna Jerolimov
Želimir Muretić
Abstract
Knowledge of the dynamics of growth and eruption of teeth during the period from mixed to permanent dentition is essential as the majority of malocclusion begins at this time, and requires prompt orthodontic treatment.
The aim of this study was to determine the level of the position of tooth germs and their zones of resistance in relation to the occlusal plane, in order to determine potential differences between male and female subjects and to conclude whether differences exist in the level of the germs and order of eruption in the examined groups of teeth.
The sample comprised 200 orthopantomograms (96 boys and 104 girls aged from 6 to 10 years) at the Department of Orthodontics School of Dental Medicine University of Zagreb. The shortest distance of the canine and both premolars to the occlusal plane was measured directly on the X-ray films.
Based on the results of the study it can be concluded that in boys, in both jaws during the defined development phase, the premolar was nearest to the occlusal plane, followed by the second premolar and then the canine. In girls, in the upper jaw, the first premolar was the nearest to the occlusal plane, followed by the second premolar and then the canine, and in the lower jaw the premolar was first, followed by the canine and the second premolar. In both sexes the position of the corresponding teeth was symmetric in the same jaw, and an identical order of the teeth eruption can be expected.
Examination of the differences in arithmetic means for all variables according to sex confirmed statistical significant differences for the canine, and other differences were incidental.
Keywords
supporting zone; mixed dentition
Hrčak ID:
10668
URI
Publication date:
15.3.2001.
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