. Descriptive anatomy of the human teeth . e teeth are a little broader mesio-distally ator near the occlusal surfaces than at their necks. Therefore,when arranged in the arch with their proximate surfaces incontact, there is a considerable space between their necks(Fig. 131). These are known as the inter-proximate or V-shaped spaces. The sharp angle or apex of the V-form istoward the occlusal surface, or at the contact-point of theproximation, and the open end or base is at the crest of thealveolar process (Figs. 134, 135, 136). In normal conditions,this space is filled by the soft tissues, o
. Descriptive anatomy of the human teeth . e teeth are a little broader mesio-distally ator near the occlusal surfaces than at their necks. Therefore,when arranged in the arch with their proximate surfaces incontact, there is a considerable space between their necks(Fig. 131). These are known as the inter-proximate or V-shaped spaces. The sharp angle or apex of the V-form istoward the occlusal surface, or at the contact-point of theproximation, and the open end or base is at the crest of thealveolar process (Figs. 134, 135, 136). In normal conditions,this space is filled by the soft tissues, or gums (141). Theaverage arch measures about 127 millimeters (5 inches) fromthe distal surface of the right third molar to the distal surfaceof the left third molar, following the curve of the arch, on theline of the contact-points of the teeth. This represents theaverage mesio-distal measurement of the crowns of the teethof the upper jaw taken collectively. The average measure-ment of the teeth at their necks is about 89 millimeters ( Fig. 127.
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