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report Alveolar Bone_iDraft
 

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    report Alveolar Bone_iDraft report Alveolar Bone_iDraft Presentation Transcript

    • Alveolar bone
      1
    • BONE
      Part I
      2
    • Bone Tissue
      Bone tissue
      is a specialized form of connective tissue and is the main element of the skeletal tissues.
      is composed of cells and an extracellular matrix in which fibers are embedded.
      is unlike other connective tissues in that the extracellular matrix becomes calcified.
      3
    • Functions of Bone
      Skeletal function of support, protection, locomotion and attachment of muscles
      Bone constitutes an important reservoir of minerals
      Bone is for hemopoiesis
      4
    • Compositionof Bone
      65% Inorganic (Hydroxyapatite)
      Mostly Calcium and inorganic orthophosphate deposited between collagen
      35% Organic
      28% collagen
      5%
      Osteocalcin
      Sialoprotein
      Phosphoprotein
      Osteonectin
      Bone specific protein
      5
    • Structural Elements of Bone
      Bone Cells
      Odontoblasts – forms bone
      Osteocytes – maintains bone
      Osteoclasts – resorbsbone
      Bone Matrix
      is the intercelluar substance of bone consisting of collagenous fibers ground substances & inorganic salts
      Sharpey’s Fibers
      Are a matrix of connective tissue consisting of bundles of collagenous fibers connecting periosteum to bone
      Blood vessels, nerves, lymph vessels
      6
    • Histological Arrangement of Mature Bone
      Compact Bone
      Spongy Bone
      7
    • Compact Bone
      are dense outer sheet that are closely packed
      3 Distinct Layering:
      Circumferential lamella
      Concentric lamella
      Interstitial lamella
      8
    • 3 Distinct Layering of Compact Bone:
      Circumferential Lamellae - enclose the entire adult bone, forming its outer perimeter
      Concentric Lamellae- make up the bulk of compact bone and form the basic metabolic unit of bone, the osteon
      Interstitial Lamellae - interspersed between adjacent concentric lamellae and fill the spaces between them
      9
    • 10
    • Spongy Bone
      Also called Cancellous bone
      flattened spicules surrounding the spaces known as marrow spaces containing the bone marrow
      11
    • Osteon - basic metabolic unit of bone generally oriented in the long axis of bone
      Haversian Canal - canal lined by a single layer of bone cells at the outer of an osteon; each cana; houses a capillary
      Volkman’s Canal - channels that connect adjacent haversian canal;contains blood vessels
      12
    • Periosteum – osteogenic connective tissue membrane that surrounds every compact bone; consists of 2 layers
      Inner layer – consists of bone cells; their precursors and a rich microvascular supply
      Outer layer – more fibrous, gives rise to…
      13
    • Bone Formation (Ossification)
      Endochondral(Intracartilaginous) Bone Ossification
      Has a precatilaginous stage
      Intramembranous Bone Ossification
      Mandible and maxilla
      Sutural Bone Growth
      14
    • Alveolar Socket
      Part II:
      15
    • Alveolar Socket
      Also called Dental alveolus
      are sockets in the jaws in which the roots of teeth are held in the alveolar process with the periodontal ligament.
      Alveolar socket of the second premolar tooth in a bovine maxillary bone.
      http://en.wikipedia.org/wiki/Dental_alveolus
      16
    • Alveolar Process
      Part II:
      17
    • Alveolar process
      is the thickened ridge of bone that contains the tooth sockets on bones that bear teeth.
      The alveolar process contains a region of compact bone adjacent to the periodontal ligament called Lamina dura.
      Maxilla and Mandible
      Are the tooth-bearing bones
      http://en.wikipedia.org/wiki/Alveolar_process_of_maxilla
      18
    • Lamina Dura
      is this part which is attached to the cementum of the roots by the periodontal ligament.
      http://en.wikipedia.org/wiki/Lamina_dura
      19
    • Functions of Alveolar bone
      Acts as the anchoring of teeth within the alveoli
      Absorption and distribution of occlusal pressures produced by intermittent tooth contacts during chewing, swallowing, speech and parafunctional activities such as grinding and chewing
      20
    • Structure of the Alveolar Bone
      Cortical Plate – outermost part
      Alveolar bone proper or lamina
      Spongiosa – spongy bone
      21
    • Cortical Plate
      Outer bony plate of varying thickness, which is the outside wall of the maxilla and mandible, covered with periosteum
      Continuous with the lamina cribriformis at the orifice of the alveoli – alveolar crest
      Consists of haversian systems (osteons) and interstitial lamellae
      Thicker in the mandible than maxilla
      Generally greater on the lingual than on the buccal/facial
      22
    • Alveolar Bone Proper or Lamina
      An inner, heavily perforated bony lamellae, forming the alveolar wall
      In radiograph, appears as radioopaque line distinct from the adjacent spongiosa – Lamina Dura
      Contains osteons like other cortical bone, but is distinguished by the presence of Bundle Bone
      23
    • Bundle Bone
      Multiple layers of bone parallel to surface of alveolar wall which are penetrated by bundles of Sharpey’s Fibers embedded nearly right angle…
      24
    • Spongiosa
      Are spongy (or cancellous/trabecullar) bone between the 2 bony plates and between the lamina cribriformis of adjacent teeth or roots
      Consists of delicate trabeculae, between which are marrow spaces, filled mostly with fatty marrow
      Regions of maxillary tuberosity and the angle of mandible, erythropoietic …
      25
    • Vascular Supply of Alveolar Process
      Alveolar process of the maxilla
      Anterior and posterior alveolar arteries (branch from the maxilla and infraorbital arteries)
      Alveolar process of the mandible
      Inferior alveolar arteries (internal)
      Periosteal branches of submental and buccal arteries (external)
      26