Abstract
In recent years, tooth-to-benture-base discrepancy has been attracting the attention of dentists as a factor that influences malocclusion and other oral deseases. However, there are still doubts concerning the reliability of the relationship, because, although many reports in regard to the relation between the discrepancy and the oral disease were investigated with the measured value in accordance with the methods of Tweed, whether this measurement is proper to epidemiological evaluation of the discrepancy is questionable.
The present study was aimed at solving this question.
The data were taken from the dental casts and Roentogen ographic cephalograms of 132 school children at the stage of permanent dentition.
The results obtained were as follows:
1. The interrelationship between the measured values in according to the method of Tweed and the severe scale of crowding showed a higher correlation coefficient than the other interrelationships.
2. The numerical value that was measured with Tweed's method, except that of the Head Plate Correction (A. L. R. A. L. ) also accurately evaluated the clinical the irregglarity of permanent dental Arch.
3. The Spee Cqrve, over bite and over jet expressed the minor clinical malocclusion in relation to the tooth-to-denture-base discrepancy.
