Types of bone

Posted by DAM on February 9, 2012 in BONE AND ALVEOLAR PROCESS | Short Link
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Types of bone  Bone is classified according to its type into: 1. Lamellar bone (mature or secondary) a- Compact (cortical) bone. b- Spongy ( Cancellous, trabecular ) bone. Compact and spongy bones are microscopically similar and are formed in the same way. 2.   Non lamellar bone (woven, primary or immature bone). 3.   Bundle bone [1] […]

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Physiological changes of the alveolar process

Physiological changes of the alveolar process The internal structure of bone is adapted to mechanical stresses. It changes continuously during growth and alteration of functional stresses. In the jaws, structural changes are correlated to the growth, eruption, movements, wear and loss of teeth. All these processes are made possible only by a coordination of formative […]

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Macro and micro anatomy of the alveolar process

Macro and micro anatomy of the alveolar process The adult alveolar process is formed of: 1- The alveolar bone proper The osteoblasts that form the alveolar bone proper are derived from the dental sac. The alveolar bone proper (ABP) is a thin layer of bone that forms the inner wall of the sockets facing the […]

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Structure of bone

Structure of bone Periosteum and Endosteum The Periosteum lines the outer surface of compact bone. It consists of 2 layers: 1. Outer fibrous layer contains dense irregular connective tissue. 2. Inner cellular layer consists of osteoprogenitor cells, osteoblasts, and blood vessels. The Sharpey’s fibers (also called perforating fibers) which are collagenous fibers from the outer […]

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Bone cells

Posted by DAM on February 9, 2012 in BONE AND ALVEOLAR PROCESS | Short Link
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Bone cells 1- Osteoprogenitor cells 2- Osteoblasts 3- Osteocytes 4- Osteoclasts 1-Osteoprogenitor cells: They are undifferentiated mesenchymal cells that have the capacity to divide and differentiate to other bone cells ( osteoblast and osteoclast). These ceils are located in the deepest layer of the periosteum, and lining the vascular canals of the compact bone. Morphologically, […]

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Composition of bone

Composition of bone Bone is composed of: 1- Inorganic substances ( 65% by weight) Which consist mostly of calcium and phosphate in the form of hydroxyapatite crystals. Besides other radicals such as sodium, magnesium, sulfate fluoride and iron are present. The hydroxyapatite crystals are deposited on, and in between the collagen fibrils resulting in the […]

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BONE AND ALVEOLAR PROCESS Bone is a highly specialized calcified type of connective tissue which is rich in blood supply. Function: 1. It forms the skeleton of the body. The calcified bone gives the body support and strength, (bone matrix has a high degree of structural organization which enable bone to recover from tension and […]

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Age changes of PDL

Posted by DAM on February 8, 2012 in Periodontal ligament | Short Link
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Age changes of PDL -It shows decreased vascularity. -It becomes thinner due to decreased activity. -Free or attached cementicles may be found and increase in number by age. -There is continuous root migration of the attachment epithelium with detachment of the cervical fibers of the PDL.

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Structure Of Periodontal ligament 2

1  Structure Of Periodontal ligament 2   C. Alveolodental ligament □ Alveolar crest group: The fiber bundles radiate from the crest of the alveolar process and attach themselves to the cervical part of the cementum. These fibers limits vertical and intrusive movements.   •    The horizontal group: The fiber bundles run horizontally between the cementum […]

Structure Of Periodontal ligament 1

Structure Of Periodontal ligament 1   The connective tissue of the PDL consists of: (A) Cells (B) Extracellular substance formed of ground substance and fibers. There are also rich supplies of blood vessels, nerves and lymphatics.   [A] cells The cells of the PDL may be divided into the following categories; 1-Synthetic cells; fibroblasts; cementoblasts; […]

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