A text-book of dental histology and embryology, including laboratory directions . termined bythe forces to which it has been subjected, but also that itsminute inner structure is definitely arranged with referenceto these forces. The direction and arrangement of theplates of cancellous bone are continually changed and rebuiltto readjust them to the support of new conditions (Fig. 232). Cribriform Plates.—The alveoli or sockets into which theroots of the teeth fit are bounded by a thin, definite wall,which is pierced by a great many openings. These havebeen called the cribriform plates, or siev
A text-book of dental histology and embryology, including laboratory directions . termined bythe forces to which it has been subjected, but also that itsminute inner structure is definitely arranged with referenceto these forces. The direction and arrangement of theplates of cancellous bone are continually changed and rebuiltto readjust them to the support of new conditions (Fig. 232). Cribriform Plates.—The alveoli or sockets into which theroots of the teeth fit are bounded by a thin, definite wall,which is pierced by a great many openings. These havebeen called the cribriform plates, or sieve-like plates. Theyunite the cortical plates of the bone at the border of the 378 THE TEETH AND DEVELOPMENT OF THE FACE alveolar process, and are fused with it, on their labial andlingual sides. The cribriform plates forming the walls of thealveoli are really made up of a thin layer of subperidentalbone, which has been built on to the plates of cancellousbone, to attach the fibers of the peridental membrane (seep. 299). Within the substance of the bone and surround- Fia. 287. The distribution of bone in the aiveolar process. ing the course of the inferior dental artery and nerve isfound what Cryer has called the cribriform tube. Thisextends from the point where the arteries and vein enterthe substance of the bone on the lingual surface of theramus, posterior to the alveolar process and below theoblique line, and extends through the cancellous portion of RELATION OF THE TEETH TO THE BONE 379 the body of the bone, emerging at the mental is really a rather definite arrangement of the plates ofcancellous bone around the vessels and the nerves. Alveolar Process.—If the adult alveolar process as seen inthe skull is examined, it is apparent that the bone is arrangedso as to give the greatest support with the least possible bulk,and where there is an increase in bulk it is to meet somespecial force (Fig. 287). The incisors and cuspids are usedchiefly to bite off pieces
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
