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Journal of Dental Research
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A Genetic Contribution to Dental Caries, Occlusion, and Morphology as Demonstrated by Twins Reared Apart

J.C. Boraas

Department of Pediatric Dentistry, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455

L.B. Messer

Department of Pediatric Dentistry, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455, Postdoctoral Research Training Program in Dental Caries (NIH), School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455

M.J. Till

Department of Pediatric Dentistry, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455

The heritability of dental characteristics has been systematically studied in animals, human populations, families, and twins, but not in twins reared apart. Under the assumption that environmental factors are no different for monozygotic twins reared apart than for dizygotic twins reared apart, the present study measured the genetic variance of several dental characteristics in twins reared apart. Ninety-seven subjects (44 twin pairs, three triplet sets) of mean age 40.6 years (S. D. 11. 7) were examined over a six year period by means of clinical and radiographic examinations, study models, and dental history questionnaires. Characteristics assessed retrospectively were: dentate status, treatment status, treatment/caries status, tooth size, malalignment, occlusion, and morphology. Data were analyzed by two-way ANOVA, intraclass correlations, heritability estimates, and concordance. There was statistically significant resemblance within monozygotic but not dizygotic pairs in the number of teeth present (p<0.001), percentage of teeth and surfaces restored (p<0.001), percentage of teeth and surfaces restored or carious (p< 0. 001), tooth size (p < 0. 001), and malalignment (p <0. 009). Intercanine and intermolar arch width showed significant resemblance within both monozygotic (p<0.001) and dizygotic (p <0. 01, p<0.05) pairs, whereas overjet and overbite showed no significant resemblance within pairs. Morphological features (Carabelli's trait and mandibular first premolar groove configuration) were more highly concordant in monozygous than in dizygous twins. This study provides new evidence for a marked genetic component to dentate status and dental caries experience and confirms previous reports of acknowledged inherited contributions to tooth size, malalignment, occlusion, and morphology.

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Journal of Dental Research, Vol. 67, No. 9, 1150-1155 (1988)
DOI: 10.1177/00220345880670090201
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