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30 Cards in this Set
- Front
- Back
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Contents of Periodontium
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Cementum, Alveolar Bone, Periodontal Ligament, Gingiva
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Function of periodontium
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serves to support the tooth in relationship to alveolar bone
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Cementum
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anchors PDL to alveolar bone; hard tissue; recieves nutrients from PDL; forms throught life; yellow hue, grainy feel; more lucent than E less lucent than P
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Thickness of cementum
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thickest at apex and interradicular areas of multirooted teeth, thinnest at CEJ
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Mature Cementum Consists mainly of...
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calcium hydroxyapitite
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Development of Cementum
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Develops from dental sac, undifferentiated cells become cementoblasts, cementogenisis lays down cementoid
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What forms the dentinocemental junction, DCJ
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apposition of cementum over dentin
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Cementocytes
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trapped cementoblasts
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Microscopic appearance of cementum
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composed of mineralized fibrous matrix and cells, sharpleys fibers
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Sharpleys Fibers
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portion of collagen fibers from PDL embeddded in cementum, vert end of PDL
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Cementum patterns at CEJ
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1. cementum overlaps at enamel 2. cementum & enamel meet 3. gap exists BW cementum & enamel (sensitivity)
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Resorption
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removal of cementum due to trauma by odontoclasts/reversal lines appear scalloped when stained
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Cementum repair
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resorption and apposition of cementum by cementoblasts in adjacent PDL, noted by layers of growth or arrest lines appear as smooth growth rings (when there is trauma there are microscopic signs)
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2 types of cementum
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1. Acellular-Primary, 1st layer of cementum deposited at DCJ
2. Cellular-Secondary, last layer of cementum deposited over acellular cementum |
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Hypercementosis
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excessive production of cellular cementum at apex of root/ of trauma or infection origin
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Cementicles
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calcified bodies of cementum found either attached to cemental root surfacesor lying free in PDL, possibly due to trauma or sharpleys fibers
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Cemental Spurs
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found at or near CEJ/ similar to enamel pearls (cannot scale off, found on xray)
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Cemental Carries
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a chronic condition that forms a large shallow lesion & slowly invades 1st the dentin then the pulp; above the enamel on root of tooth, recession must be present, very sensitive
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Alveolar Bone function
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Supports and protects the teeeth, contains the roots of teeth; cementum of root attaches to it by way of PDL, mainly calcium hydroxyapitite
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Basal Bone
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portion apical to roots (beyond roots)
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Alveolar bone PROPER
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CRIBIFORM PLATE, BUNDLE BONE; lining of tooth socket many holes, sharpleys fibers from PDL insert here
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Alveolar Crest
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most cervical rim of the alveolar bone proper (faint white line on xray)
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Lamina Dura
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portion of bone proper seen on radiographs (outlines root of the tooth, radioopaque)
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Intradicular
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bone between the roots of a multirooted tooth
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Alveolar bone consists of...
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Cortical bone, trabecular bone, interdental septum
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Cortical Bone (plates)
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compact bone on facial and lingual surfaces
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trabecular bone
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cancellous bone between alveolar bone proper and cortical bone
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interdental septum (bone)
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bone between two neighboring teeth
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development of jaw bone
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Max & mand develop from tissues of 1st brachial arch (mand arch); both begin as small centers of intramembranous ossification located around stomodeum
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Mesial Drift
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normal, natural movement phenomenon in which all teeth move slightly toward the midline of oral cavity over time/ can cause crowding
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