The Dental cosmos . stoid process. of the bone for the antrum of Highmore is first seen about the secondyear after birth. From that time to full development there is a constantchange in the structure ; bone is deposited on the outer surface, andan absorption of the inner, although this absorption is slow, and thewalls do not reach their normal thinness until after maturity. This isimportant when we consider the influence of the lateral pressure of thezygomatic arch on the form of the developing maxilla, owing to theinharmonious development of the frontal and other cranial bones. It will be see
The Dental cosmos . stoid process. of the bone for the antrum of Highmore is first seen about the secondyear after birth. From that time to full development there is a constantchange in the structure ; bone is deposited on the outer surface, andan absorption of the inner, although this absorption is slow, and thewalls do not reach their normal thinness until after maturity. This isimportant when we consider the influence of the lateral pressure of thezygomatic arch on the form of the developing maxilla, owing to theinharmonious development of the frontal and other cranial bones. It will be seen that the spheno-maxillary fissure removes much ofthe posterior support of the maxilla, and that the elongation of themaxilla is by the addition of bone anterior to the pterygoid process ofthe sphenoid. In Fig. 3 it will be more clearly seen that the principal growth ofthe maxilla takes place at the anterior edge of the palate bone, whichforms a portion of the roof of the mouth, floor, lateral wall and roof Fig. FIRST DISTRICT DENTAL SOCIETY, STATE OF NEW YORK. of the nose, and floor of the orbit, and which is attached by suture to»the pterygoid process, by the tuberosity or elongated wedge project-ing backward into the pterygoid notch of the sphenoid, and that thepterygoid process is practically a fixed point, anterior and near to>which all development takes place. The sphenoid is termed the key to the cranium, as it articulates withall the other cranial bones, and as we examine the skull we find that itslateral growth harmonizes the width to some extent of the posteriorportion of the superior and inferior maxillae ; that of the inferior being:governed by the lateral growth of the great wing, increasing the dis-tance between the two glenoid fossae, and the superior by the great,wing and the pterygoid process. Fig 3.—Base of skull, taken from Gray.—A, intermaxillary bone ; B, anterior palatine canal;C, palate process of superior maxillary; D, palate bone; E, body o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
