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J Dent Res 38(1): 135-148, 1959
© 1959 International and American Associations for Dental Research
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VARIABILITY OF TOOTH FORMATION

STANLEY M. GARN 1, ARTHUR B. LEWIS 1, and DEMAREST L. POLACHECK 1

1 Fels Research Institute, Antioch College, Yellow Springs, Ohio

1. Variability in the age of occurrence of 3 stages of tooth formation was investigated on serial oblique-jaw roentgenograms of 255 Ohio-born white children.

2. For the mandibular molar and premolar teeth, variability of tooth formation was almost perfectly correlated with the median age-for-stage (r = 0.96). Although later-forming teeth were more variable than earlier-forming teeth, relative or percentage variability was nearly constant throughout.

3. Boys and girls proved to be approximately equal in the variability of the 3 formation stages of the 5 mandibular teeth considered.

4. Comparing the 5th-95th percentile ranges from the present study to the "ranges" cited by most authorities, the ranges obtained here were 3 times as great as those ordinarily quoted.

5. Differences between the present findings and the "ranges" commonly given were attributed to the extremely small samples previously studied. In many cases published "ranges" had been based on no more than two specimens of unstated sex and of questionable developmental normality at the time of death.

6. When the present data on tooth formation were compared with data on other developmental measures, relative variability proved to be of the same order of magnitude as tooth eruption, sexual maturation, etc., but somewhat less than that for osseous development.

7. These findings indicated the need for more adequate data on the variability of tooth formation, ideally based on samples of not less than 100 boys and girls for each developmental stage of each tooth, respectively.

Submitted on July 18, 1958
Revised on October 2, 1958




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