Orthodontic anomalies in primary and permanent dentition--a longitudinal study.

This research has intention to examine the stability and the changes of the Classes from the period of primary to permanent dentition on longitudinally examined subjects. The sample consisted of 246 children (132 boys and 114 girls) with orthodontic anomalies in primary dentition that were not orthodontically treated until the ensuing visit made by the same orthodontist in permanent dentition. 71.9% of the examined children (72.7% boys and 71.0% girls) registered no Class changes within the analysed period. Between boys the falling of the Class I occlusion, from primary to permanent dentition is unsignificant, but between girls Class I occlusion is falling significant and grow Class II malocclusion. In boys 29.2% of changes occurred in Class I occlusion of which 25.0% were brought to Class II while 4.2% to Class III malocclusion. In girls from 32.9% changed Class I occlusion, 28.9% changed into Class II, and 3.9% into Class III malocclusion. The Class II malocclusion during the development of dentition is more stable than the Class I occlusion.