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Extra resources for International Review of Cytology, Vol. 142
Directed either toward the osteoid layer or the opposite side. Similarly, cementoblasts seem to have the option of functioning in either a multipolar or an unipolar fashion. , 1989). C. Attachment of Matrices t o Growing Dentine Attachment of the early, first-formed cementum matrix to root dentine is one of the cardinal aspects of root development. In both humans and rats, cementum matrix attachment occurs on a previously formed dentine surface while the respective tooth erupts. In other words, the dentine surface serving as an attachment site moves in the coronal direction while attachment is secured.
Magnifications: a, x580; b,c, x2700; inset, ~ 5 8 0 (a,c) . From Bernstein er a / . (1989a). TABLE Ill Diameter (nm) of Collagen Fibrils of the Fiber Fringe Matrix Grown in Cultures, Compared to Cementum Fibrilsa % Diameter distribution (nm) Root discs (decalcified) Days in culture 56 56 124 124 Cementum Cementum F-coated F-coated F-coated F-coated - - Cells N Diameter (x ? s) HPLC HPLC + HBC HPLC HPLC + HBC - 80 80 160 160 320 320 42+ 65 ? 472 63 ? , 1988, 1989a,b; N = number of measurements; F, fibronectin; M.
Mature cementoblasts, separated from one another, become embedded in CIFC matrix that accumulates between and around them (Fig. 6a, inset). This matrix appears denser than that at the predentine surface and consists mainly of randomly oriented collagen fibrils. However, the cementoblasts FIG. 6 (a) Light micrograph depicting the root surface zone of rapid CIFC genesis and appositional growth, coronal to the advancing root edge (ARE, see Fig. 5, parts 1-3). (b) Electron micrograph of the cluster of precementoblasts (PC) along the most recently formed root predentin (PD; see Fig.