A text-book of dental histology and embryology, including laboratory directions . re of a pyorrhea case, therefore, becomes abiological problem. In this connection it is important toremember that a surface of cementum which has long beenbathed in pus may be so filled with poison that no cell canlie in contact with it and perform its functions. Osteoblasts.—The osteoblasts of the peridental membraneare exactly like osteoblasts in other positions. They coverthe surface of the bone of the alveolar wall lying betweenthe fibers which are embedded in it. Even in the youngsubject they are not found i
A text-book of dental histology and embryology, including laboratory directions . re of a pyorrhea case, therefore, becomes abiological problem. In this connection it is important toremember that a surface of cementum which has long beenbathed in pus may be so filled with poison that no cell canlie in contact with it and perform its functions. Osteoblasts.—The osteoblasts of the peridental membraneare exactly like osteoblasts in other positions. They coverthe surface of the bone of the alveolar wall lying betweenthe fibers which are embedded in it. Even in the youngsubject they are not found in every position, while in anadjoining area the surface of the bone may be covered withthem. In the old subject they are generally absent or havebeen reduced to flattened scales, which are very difficult todemonstrate; but even in these cases areas will be found inwhich osteoblasts are present. These are areas of active 298 THE PERIDENTAL MEMBRANE bone formation. The osteoblasts lay down bone exactlyas occurs in attached portions of the periosteum, but after Fig. 230 PdM PdB. HB Penetrating fibers in bone. A field from plate XV: , peridental membrane;Ob1, osteoblasts of peridental membrane; Ob2, osteoblasts of medullary space; ,solid subperidental and subperiosteal bone with embedded fibers; Ms, medullaryspace formed by absorption of the solid subperidental bone with embedded fibers;, Haversian system bone without fibers built around the medullary space.(About 200 X) PLATE XV Cm Pd PdB KHI^s^ HSMBmBBc . h^B ^BjjrSSp^. * ^?j0kf* Pc/ Ms HB Per Border of Growing Process. Cm, eementum; Pd, peridental membrane; Pd. B, solid subperidental andsubperiosteal bone with embedded fibers; Ms, medullary space formed byabsorption of the solid bone; H. B, Haversian system bone without fibers;Per, periosteum. (About SO X) OSTEOCLASTS 299 a little thickness of this solid peridental bone has beenformed it is perforated by penetrating canals, on the wallsof which absorptions occur, fo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
