Morphological Evaluation of Deciduous Molar Crowns in Children in Tianjin

Abstract

We conducted dental examinations on kindergarten children in Tianjin, China. Using upper and lower dental casts obtained from the children, we anatomically observed the morphology of the deciduous molar crowns. The results were compared to those in previous studies.
1. Among the deciduous molar teeth observed, there were no differences between Japanese and Chinese children in the crown occlusal surface patterns.
2. There were no differences in the incidence of the cingulum in maxillary and mandibular deciduous first molars, the moon-shaped ridge on the upper second molar buccal surface, the Carabelli's tubercle in maxillary deciduous first molars, and the 6 th cusps in mandibular deciduous second molars between Japanese and Chinese children.
3. There were no differences in the incidence of the mesial tubercle in maxillary deciduous molars between the Chinese children in Tianjin and Shanghai or Shijiazhuang.
4. There was a correlation between the incidence of the Carabelli's tubercle in the maxillary deciduous first molars and that in the maxillary deciduous second molars in the same dental arch.
5. There was a correlation between the incidence of the Carabelli's tubercle and that of the protoconule in the same maxillary deciduous second molar.
6. The incidences of the 7 th cusp and protostylid in the mandibular deciduous second molars were high in the Japanese and Chinese children.