Please enable JavaScript.

Coggle requires JavaScript to display documents.

Alveolar Bone (Bone Structure (Woven Bone/ Osteoid (Immature, first formed…

- - - - 3 types of lamellae layering
        
        Circumferential Lamellae
        
        Parallel layers surrounded by bony surfaces
        
        At external (periosteal) and internal (endosteal) surfaces
        
        Concentric Lamellae
        
        Makes up bulk of compact bone
        
        Small concentric layers surrounding central Haversian canal
        
        Forms the harvesian system
        
        Adjacent osteons connected by Volkmann’s canal
        
        Contains blood vessels
        
        Runs perpendicular to Long axis of osteons
        
        Interstitial Lamellae
        
        Fragments of pre-existing concentric Lamellae from osteons created during remodelling
        
        Interspersed between osteons
  - - - apposed to each other to form sponge-like network of trabecular
  - - - Red, hematopoietic
      - Contains stems cells of fibroblatic/ mesenchymal type
    - - Yellow
      - Loss of hematopoietic potential
      - Increased accumulation of fat cells
  - - - Inner cellular/ cambium layer
        
        Loose, vascular, osteogenic
      - Outer fibrous layer
        
        Less cellular, continuous with joint capsule
- - - - Cuboidal cells
      - Forms layer on actively forming bone
      - HIstology: basophilic cytoplasm, extensive rER, round nucleus, adherents and gap junctions
      - Rich in alkaline phosphatase
      - Derived from mesenchymal precursor cells in bone marrow
        
        Initial development of alveolar bone is formed by osteoclasts differentiated from outer layer of dental follicle
      - Function
        
        Formation and organization and mineralization of ECM
        
        Synthesized osteoiud bone matrix on existing mineralized surface (mineralization front)
        
        Type I collagen deposited in parallel or concentratic layers to produce mature lamellar bone
        
        Rapidly forming bone results in basket-like weave collagen aka woven bone
        
        Synthesis of Proteoglycans and other bone proteins (e.g. osteocalcin)
      - Can be stimulated by hormones
        
        E.g. PTH, estrogen, growth factors, physical activities
    - - Formed by osteoblasts trapped in bone matrix
      - Reside in lacunae
      - Processes connect with each other through system of canalliculi
      - Maintain bone intergrity and vitality
        
        Through intercellular communication via canaliculi system, and regulating the response of bone to the mechanical environment
  - - - May differentiate back to osteoblasts
  - - - Osteoclasts adhere to surface of bone undergoing resorption and lie in hollowed out depressions called Howship’s lacunae
      - Involves mineral dissolution and collagen degredation
- - - - Hole resorbed by osteoclatss is filled with osteoblasts
- - - - Compact bone extending from alveolar crest
      - Joins alveolar bone proper to lower border of socket
    - - Compact bone lining the tooth socket
      - Sharpey’s fibres embedded into bone, resulting in corse-fibrered texture
      - Aka bundle bone, cribform plate, lamina dura
    - - Encloses vessels and yellow marrow (rich in adipose tissue)
      - Absent in anterior teeth
      - Continuous remodelling takes place esp bc of masticstory forces
      - Higher turnover rate than cortical bone bc of mechanical role
      - Aligned along lines of stree to withstand forces applied
        
        Perpendicular to outer and inner compact layers