Abstract
The development of overbite was surveyed in 52 dentitions, each from 5 to 10 yrs. of age. The degree of incisal overbite primarily was determined by the extent of mandibular forward growth which occurred during the eruption of the lower permanent incisors and later of the permanent canines and premolars. A lessened forward extension of the lower arch as compared with the upper one was responsible for a greater incidence of severe overbite in the mixed dentition. The deciduous overbite was also a determining factor in that the slight overbite became deeper. The definite overbite of the permanent dentition finally depended upon the eruption sequence of the permanent canines and premolars. If in the lower arch the sequence was canine, first premolar, second premolar, and in the upper arch first premolar, canine and second premolar, the best results were observed. Incisal overbite developed independently of the mechanism of molar adjustment. In conclusion the evidence of these 4 developmental studies shows that teeth and alveolar process are a genetic entity. Differentiation between general growth of the facial skeleton and that of the alveolar process should be conducive to a better understanding of the etiology of mal-occlusion and the development of certain paradentopathies.
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