Analysis of three groups of case histories of first-year dental students, at Tufts College, disclosed apparent relationships as follows : Damaged teeth and dental heredity.—Most of the better-than-average dental heredities occurred among the men showing the best dental conditions. (Conclusion based upon analysis of two groups of 54 case histories each.) Damaged teeth and height.—There is a definite, although not great or uniformly constant, tendency for tall men to have somewhat poorer teeth than do short ones, other factors being approximately equal. Of 183 cases, the 38 shortest men (66.25 inches or less) had an average of 14.1 damaged teeth, and an average age of 22.24 years; the 32 tallest men (70.75 inches or more) averaged 18.2 damaged teeth and 22.26 years. Changing the height limits of the shorts and talls 0.5 inch did not materially alter the result. Use of a more accurate caries-index intensified the contrast between shorts and tails. Consideration of the dental heredity of an individual seemed important in accounting for exceptions to the general rule. (Conclusion based upon analysis of the three groups of case histories.) Damaged teeth and health.—A somewhat higher incidence of caries occurred in the sickliest men of a group of 54. The ten healthiest had an average of 16.1 carious teeth, as compared with 18.8 in the ten sickliest. Considerations of age, heredity, and height did not alter the picture. (Analysis of a second group of 54 men gave similar results.) Proximal caries and health.—The averages are 7.4 teeth having proximal caries, per individual for the healthiest group; 10.7 for the sickliest. The number of extracted teeth was 27 in the first group; 26 in the second. Therefore, missing teeth cannot be held responsible for the difference in proximal caries frequency. Caries and body build.—The pyknic type is dentally better than the asthenic, other factors being equal.
Reference: J. Den. Res., 15, 395, 1936.