The etiology of osseous deformities of the head, face, jaws and teeth . refore,that the alveoli are not a reliable route by which to reach thelowest point in the floor of the antrum, nor is the operatorsure of reaching it at all. It is easy to see how in a very fewcases the development of the antrum and nasal cavities mightbe so arranged, together with the thinness of the alveolarprocess, that the roots of the teeth may penetrate the floor 290 ETIOLOGY OF OSSEOUS DEFORMITIES OF of the cantrum, as illustrated in Fis:. 91. These cases, how-ever, are very rare, as we shall see later. Again, we ca
The etiology of osseous deformities of the head, face, jaws and teeth . refore,that the alveoli are not a reliable route by which to reach thelowest point in the floor of the antrum, nor is the operatorsure of reaching it at all. It is easy to see how in a very fewcases the development of the antrum and nasal cavities mightbe so arranged, together with the thinness of the alveolarprocess, that the roots of the teeth may penetrate the floor 290 ETIOLOGY OF OSSEOUS DEFORMITIES OF of the cantrum, as illustrated in Fis:. 91. These cases, how-ever, are very rare, as we shall see later. Again, we canalso observe how in most cases, owing to the thickness of thealveolar walls and the position of the antrum, the roots of theteeth will not reach it. As will be noticed it is very rarelyand almost never the case that the roots of the first and secondbicuspids enter the floor of the antrum. The roots of the firstpermanent molar in its relation to the antrum are such thatit is almost impossible to penetrate them. Of the 11,000 skulls examined for deformities only 3,000. Fig. 91. were in a broken condition, so that the antra could be exam-ined, making 6,000 antra in all. Of this number 1,274:, orabout 21 per cent, had abscessed molar teeth. Of this num-ber 76, or about 6 per cent, extended into and apparentlydischarged into the antrum. Taking into consideration thefact that specialists were unknown among the people whoseskulls were examined, we would expect to find a larger per-centage of abscessed cavities than at the present day, whichhas been shown by the examination of both skulls and were found in 963 cases. These ranged all the wayfrom a simple ridge running along the floor to a partitionextending two-thirds the height of the cavity. Again, several THE HEAD, FACE, JAWS AND TEETH 291 septa occurred in all directions, which gave the appearance ofof ethmoidal cells extending throughout the entire cavity. In the treatment of 367 cases of pulpless teeth, in connec-
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