This study was undertaken to examine the relationship between tooth size and arch dimension in dental spacing.
Two groups of dental casts were selected on the basis of dental spacing. One group, consisting of 38 pairs of dental casts (19 male and 19 female) and cephalometrics, exhibited remarkable dental spacing. A second group, consisting of 40 pairs of dental casts (20 male and 20 female) and cephalometrics, exhibited no spacing. Mean, Standard deviation, t-test of the following parameters were used to compare two groups : individual and collective mesiodistal tooth diameters, arch width and length, basal arch width and length, SNA, SNB, ; toSN, IMPA, jtoF. P. , ; toF. P.
The following results were obtained.
1. In the tooth size, male with spacing had generalized smaller teeth and female with spacing had smaller 4 anterior teeth than the normal group.
2. In the arch width and arch length, the spaced group had longer width and length than the normal group but there was only statistical significance in the arch length.
3. In the basal arch width and length, the spaced group had longer width and length than the normal group but there was only statistical significant-- in the basal arch length.
4. In maxilla, mandible, and anterior tooth position, the difference between the spaced group and the normal group was no sigificance.
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