What is the formation of cementum?
Cementum is a thin layer of hard dental tissue covering the anatomic roots of teeth. It is formed by cells known as cementoblasts, which develop from undifferentiated mesenchymal cells in the connective tissue of the dental follicle.
When is cementum developed?
Development. Cementum is secreted by cells called cementoblasts within the root of the tooth and is thickest at the root apex. These cementoblasts develop from undifferentiated mesenchymal cells in the connective tissue of the dental follicle or sac.
How acellular cementum is formed?
The development of acellular cementum seems to be associated with secretion of enamel-related proteins by cells of the epithelial root sheath. Formation of the matrix for cellular cementum appears to be induced by exposure of the inner layer of the epithelial root sheath to the mesenchymal cells in the dental follicle.
What are the physiologic changes in cementum?
Normal physiologic dynamics for cementum is either appositional growth or resorption. Studies have hypothesized that the mechanism for this appositional growth is attributed to mineralization of the organic matter by the cementoblasts in response to mechanical strain along the PDL-cementum interface [7, 52–56].
What is primary and secondary cementum?
Primary cementum is frequently the only type of cementum found on the roots of incisors and canines (single-rooted teeth). Secondary cementum is found chiefly in the apical regions of the roots of premolars and molars (multi-rooted teeth).
Which stage of development of cementum involves root formation?
Cementogenesis
Cementogenesis is the process of cementum formation which covers the tooth root by cementoblasts of mesenchymal origin (Figure 26.4). Differentiation of cementoblasts is not fully understood, but some epithelial components seem to stimulate dental follicle cells to differentiate into cementoblasts.
What is the first stage of tooth development?
The odontogenesis of the primary dentition begins in the embryonic period, between the sixth and the seventh week of prenatal development. The first stage of tooth development is initiation, where ectoderm induces the mesenchymal tissue in order to initiate the process.
What is the primary function of cementum?
The main function of cementum is tooth support or tooth anchorage together with the principal fibers and alveolar bone.
Which collagen is predominant in cementum?
The organic matrix of cementum consists predominantly of collagens. In bovine cementum type I collagen accounts for more than 90% of the organic matrix and type III collagen approximately 5% [39]. In human cementum type I collagen appears to be the only collagen type [40].
How does cementum change with age?
Cementum in humans increases in thickness with age, and new layers are deposited on the outside of the dentin throughout the life of the individual. Cementum is formed as a result of a continuous process throughout life and it has been shown to triple in thickness between the ages of 20 and 60 years [10].
