Abstract
The purpose of this study was to examine the developmental changes of the maxillary and mandibular base length in crowded dentition. The subjects were divided into four groups depending on their dentition at Hellman's dental stage
IVA: 1) males with normal dentition (n=5),2) males with crowded dentition (n=5),3) females with normal dentition (n=5) and 4) females with crowded dentition (n=5). The materials used in this study were lateral cephalometric X rays which were taken longitudinally from ages II C to IVA.
The results obtained were as follows;
(1) A'-PNS for both males and females with crowded dentition were slightly smaller than those for males and females with normal dentition at age II C, while the difference both was obvious from ages III A to IVA in that of males and females with crowded dentition were smaller than those for males and females with normal dentition.
(2) ABR'-B' for both males and females with crowded dentition were similar to those for males and females with normal dentition at age II C, while the difference both was obvious from ages IIIA to IV A in that males and females with crowded dentition were smaller than those for males and females with normal dentition.
The maxillary and mandibular base length of crowded dentition was smaller than that of normal dentition from ages III A to IVA, while the maxillary and mandibular base length of crowded dentition was similar to normal dentition at age II C.
