Principles and practice of operative dentistry . eroot, nor the root completed, until after the crown of the tooth has beenerupted. At the time of the eruption of the tooth the osteoclasts have madean opening in the cap of the crypt (Fig. 208) large enough for the crown toeasily pass; this leaves a considerable space between the bone and root,which is occupied by the, at this time, thick pericemental membrane. The latest theory is that suggested by Constant (Journal British DentalAssociation, 1896),—namely, that the blood-pressure may be the force whichimpels the tooth in its movement from the
Principles and practice of operative dentistry . eroot, nor the root completed, until after the crown of the tooth has beenerupted. At the time of the eruption of the tooth the osteoclasts have madean opening in the cap of the crypt (Fig. 208) large enough for the crown toeasily pass; this leaves a considerable space between the bone and root,which is occupied by the, at this time, thick pericemental membrane. The latest theory is that suggested by Constant (Journal British DentalAssociation, 1896),—namely, that the blood-pressure may be the force whichimpels the tooth in its movement from the crypt and through the gum,on account of the difference in the blood-supply of the parts. The pulp and the tissues beneath it have a very abundant vascularsupply, while those above are not so richly endowed. C. S. Tomes, incommenting upon this theory, says, It seems very possible that theblood-pressure keeping up a state of general tension may operate to pusha solid,body in any direction in which there is a diminished resistance, Alveolarbone. Fig. 209.—Vertical section of erupting tooth of field-mouse, showing area of resorption. X 75,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
