A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . erpendicular or even have a slightbuccal inclination. The lower molars usually have a slight mesial and lingualinclination. In many examples, however, the mesial inclination is wanting,especially in the second and third molars. All the teeth are a little broader from mesial to distal at or near the occlud-ing surfaces than at their necks. Therefore, when arranged in the arch withtheir proximate surfaces in contact, there is a considerable space between theirFig. 10. necks (Fig.
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . erpendicular or even have a slightbuccal inclination. The lower molars usually have a slight mesial and lingualinclination. In many examples, however, the mesial inclination is wanting,especially in the second and third molars. All the teeth are a little broader from mesial to distal at or near the occlud-ing surfaces than at their necks. Therefore, when arranged in the arch withtheir proximate surfaces in contact, there is a considerable space between theirFig. 10. necks (Fig. 6). These are known as the inter- proximate, or V-shaped, spaces. The sharp angleor apex of the V-form is toward the occludingsurface or at the contact point of the proxima-tion, and the open end or base is at the crest ofthe alveolar process. In normal conditions, thisspace is filled by the soft tissues, or gums (Fig. 10). The average arch measuresabout 127 millimeters (5 inches) from the distal surface of the right third molarto the distal surface of the left third molar, following the curve of the arch. This. CHAPTER IX. ARRAXGEMEXT OF THE TEETH 65 represents the average mesio-distal measurement of the crowns of the teeth of theupper jaw taken collectively. The average measurement of the teeth at theirnecks is about 89 millimeters ( inches). The remaining 38 millimeters () represent the average sum of the interproximate spaces taken collectively. On account of the difference in the conformation of the crowns and the in-clination of the teeth, the interproximate spaces vary much in width in differentdentures. They are much wider between bell-crowned teeth than between thick-necked teeth; but some interproximate space exists in every normal the crowns of the incisors and cuspids are much inclined towards the lip,the necks of the teeth form a smaller circle than the line of the contact pointsof the proximation, and in this way the interproximate spaces
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