Alveolar Bone
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Alveolar Bone

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Alveolar Bone Alveolar Bone 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