Dental casts of 242 Bedouin children were used to study directional asymmetry (DA). Results of Student's t-test pair comparison showed that for permanent dentition, 4 out of 24 DA measures were statistically significant whereas for deciduous dentition, 8 out of 20 measures were significant (p less than 0.05). The magnitude of DA was on the average 1% of the total size of the tooth. No preference regarding dimension (buccolingual, mesiodistal) or jaw (maxilla, mandible) was detected for the DA. PCA results demonstrated the independent nature of DA measures in the dentition.
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