THE STUDY OF THE SUPERIOR AND INFERIOR ALVEOLAR ARCHES IN CHINESE
- VernacularTitle:国人上、下颌牙槽弓的探讨
- Author:
Changxian ZHANG
;
Haitao WU
;
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1953;0(01):-
- CountryChina
- Language:Chinese
-
Abstract:
Measurements were made from different landmarks of the superior and inferior alveolar arches in 197 skulls and in 243 mandibles. The data were divided into four groups: 2-5 years old(only deciduous teeth in occlusion); 6-12 years old(first permanent molars in occlusion, but not second molars); 12-17 years old (second permanent molars in occlusion, but not third molars); adults (third molars in occlusion, not including the aged). The results from the observation of the adult specimens are as follows:The indices of alveolar arches are about 118.2 in maxilla; 77.6 in mandible.The average distances from Prosthion (incision in mandible) to Canine point are 19.6mm (left side), 19.8mm (right side) in maxilla; 13.8mm (left side), 14.0mm (right side) in mandible.The distances from canine point to ectomolare (the lateral most margin of the al veolar cavities of second molars in maxilla; of third molars in mandible) are about 33.7mm (left and right sides) in maxilla; 43.7mm (left side), 44.5mm (right side). in mandible.The convergence distance of alveolar arches is 42.9mm in maxilla; 26.4mm in mandible and the convergence angle is 51.5? in mandible; 43.1? in maxilla.It was found that most of the superior and inferior alveolar arches were asymmetrical, the percentages of asymmetry being 82.2 in maxilla and 67.0 in mandible of adults.
