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TOOTH DEVELOPMENT

المؤلف:  Max M. Houck، Jay A. Siegel

المصدر:  Fundamentals of Forensic Science

الجزء والصفحة:  207

2026-07-20

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TOOTH DEVELOPMENT

Teeth grow from the chewing surface, or cusps, downward to the roots. This continual process is usually broken up into phases that relate to the amount of tooth development. Humans have two sets of teeth, one when we are children, called “baby” teeth but more properly termed “deciduous” teeth, and one when we are adults, our permanent teeth. Dentists often have a dental development chart in their offices, like the one in Figure 1. Different teeth develop at different rates, with incisors developing faster than molars. Teeth erupt through the gums when they are about one-half to three-fourth developed. Notable land marks in tooth eruption are the first deciduous incisor at about 9 months, the first permanent molar at about 6 years, the first permanent incisor at about 7 years and the third permanent molar at sometime between 15 and 21 years; this latter tooth is notorious for irregular eruption and is not necessarily a reliable indica tor of age.

FIGURE 1 Teeth grow from the cusps downward to the roots. Humans have one set of teeth as children (deciduous) and one when we are adults (permanent). Tooth development is differential depending on the type of tooth it is.