The Relationship between Deciduous Dentition and Permanent Dentition

Part V. Position of Upper Lateral Incisor

Abstract

In the present study focusing on the crowding of the permanent lateral incisors of the upper jaw, we investigated the relationship between the arrangement of the deciduous lateral incisors and permanent lateral incisors in the upper jaw, the size of the alveolus and the angle of the tooth axis.
Drawing on serially recorded material maintained in the Department of Pediatric Dentistry, Nippon Dental University, the study used serial dental casts (upper jaw) of 26 subjects whose deciduous dentition proceeded to normal permanent dentition, and casts (upper jaw) of 7 subjects with deciduous dentition who later had inverted lateral incisor overbite due to eruption on the palatal side bilaterally in the upper jaw while proceeding to permanent dentition.
1) The arrangement of the deciduous lateral incisors was found to be type A in 46%, type E in 40%, type D in 8% and type C in 6% of the normal occlusion group, while type A was found in 22%, type C in 14% and type E in 64% of the inverted overbite occlusion group, showing differences between the two groups in the incidence of types of arrangement.
2) The inverted overbite occlusion group had both significantly smaller long and high-level diameters of the apical base of the deciduous lateral incisors than the normal occlusion group.
3) The axial angles of deciduous lateral incisors tended tobe smaller in the inverted overbite occlusion group than in the normal occlusion group.
Subjects with inverted lateral incisor overbite in their permanent dentition exhibited morphological findings in the deciduous dentition, particularly with respect to the size of the alveolus and axial angle of the deciduous lateral incisors.
These findings may provide important information for occlusal guidance during the deciduous dentition.