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A STUDY ON THE MESIO-DISTAL CROWN DIAMETERS OF THE DECIDIOUS TEETH AND THEIR PERMANENT SUCCSSSORS

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Abstract

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#ÃÊ·Ï#
The mesiodistal crown diameters of the decidious teeth and their permanent
successors have been studied and analyzed about the mean size, percentage and the
correlotion coefficient from the longitudinally collected 104 stone models of E. elementary
school children.
The results were as follows:
1. The mean values of decidious teeth and their permanent successors were slightly
larger in males than in females and statistical differences of males and fematss were
found in some teeth.
2. In the percentage of dicidious and permanent successors, the smallest were lateral
incisor in male, central incisor in female and maxillary 2nd decidious molar, mandibular
1st and 2nd decidious melar were larger than their permanent successors.
3. In the percentage of corresponding teeth groups, maxillary incisors were smaller
than their successors and in maxillary buccal teeth were similar to their successors, and
in mandibular buccal teeth the sum of decidious teeth were larger than that of
permanent teeth about 10%.
4. Individual correlations of decidious tooth and their permanent successor was
relatively low. The same tendencies were found at corresponding teeth groups
5. In the differences between the corresponding teeth groups, the sum of permanent
incisors were largest to their decidious teeth but the sum of mandibular buccal teeth
were the smallest.
6. The correlations for the differences of corresponding teeth groups were negative
correlated with high value.

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