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Advances in Dental Research
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Adv Dent Res 15:42-45, August, 2001
© 2001 SAGE Publications

Sex- and Age-related Differences in Primary and Secondary Dentin Formation

U. Zilberman

Laboratory of Bioanthropology and aDNA, Faculty of Dental Medicine, The Hebrew University-Hadassah, School of Dental Medicine, POB 12272, Jerusalem 91120, Israel; pat{at}cc.huji.ac.il

P. Smith

Laboratory of Bioanthropology and aDNA, Faculty of Dental Medicine, The Hebrew University-Hadassah, School of Dental Medicine, POB 12272, Jerusalem 91120, Israel; pat{at}cc.huji.ac.il

Clinical studies carried out on dentin thickness in adults, as well as experimental studies carried out on ovariectomized animals, indicate that odontoblast activity, like that of osteoblastic cells, differs in the two sexes. To examine the evidence for differences in odontoblast activity before puberty, we have measured dentin thickness and other crown dimensions from bite-wing radiographs of the lower first molars in 240 children aged 4-16 years. The radiographs were obtained from pedodontic clinics throughout Israel. Only teeth without caries or fillings were used, and the study population had minimal attrition. The results showed that dentin thickness, measured on the roof of the pulp chamber, was significantly greater in boys than in girls at all ages, and that the differences increased during puberty. The differences remained highly significant even when standardized for crown size. They demonstrate that dimorphism in dentin thickness is present even in the earliest stages of odontogenesis and increase with puberty.

Key Words: Dentin • teeth • dimorphism • odontogenesis • odontoblasts.

Advances in Dental Research, Vol. 15, No. 1, 42-45 (2001)
DOI: 10.1177/08959374010150011101
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