GOOD MORNING
CEMENTUM
DEFINITION   Cementum is the calcified a vascular    mesenchmal tissue that forms the outer layer    cover of the anatomi...
   Periodontal ligament and are formed by the    fibroblasts   Fibers that belong to cementum matrix and are    produced...
   COMPOSTION   The major proportion of the organic matrix of a    cementum is composed of type one (90%) and    type th...
   This cementum is formed before the tooth    reaches     the occlusal plane and it’s thickness ranges    froms     30 t...
   Acellular cementum also contains intrinsic    collagen fibrils that are calcified and irregularly    arranged or paral...
that communicate with each other through a  system of anastomising canaliculi Cellular cementum is less calcified than th...
   PERMEABILITY OF CEMENTUM   In very young animal’s acellular cementum    and cellular cementum are very permeable    a...
   Cementum formation is most rapid in the    apical regions where it compensates for tooth    eruption, which it self co...
   The term hyper cementosis refers to a    prominent thickening of cementum   Hyper cementosis occurs a generalisied   ...
   Local condition causing cementum resorption    include trauma from occlusion orthodontic    movement pressure from mal...
   EXPOSURE OF CEMENTUM TO ORAL    ENVIRONMENT   Cementum becomes exposed to the oral    environment in cases of gingiva...
   Three types of relationships involving the    cementum may exists at cementoenamel    junction    in about 60 -65% of...
THANK YOU  GUIDED BYDR. KRISHNA MOORTHY. MDSDR. ROOPA DEVI. MDSDR. RAVEENDHAR REDDY. MDSDR. SHARATH. MDSDR.VENKAT SUBBA RE...
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Cementum

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Cementum

  1. 1. GOOD MORNING
  2. 2. CEMENTUM
  3. 3. DEFINITION Cementum is the calcified a vascular mesenchmal tissue that forms the outer layer cover of the anatomic root Types of cementum There are two main types of cementum they are:- 1.A celluar cementum and 2.cellular cementum The two main source’s of collagen fibers in cementum are sharpey’s fibers which are the embedded portion of principal fibers of the
  4. 4.  Periodontal ligament and are formed by the fibroblasts Fibers that belong to cementum matrix and are produced by cementoblasts Cementoblasts also form the non collagenous components of the inter fibrillar ground substance such as proteoglycans, glycoproteins and phosphoproteins Proteoglycans are the most likely to play a role in regulating cell-cell and cell-matrix interactions
  5. 5.  COMPOSTION The major proportion of the organic matrix of a cementum is composed of type one (90%) and type three about (5%) collagens ACELLULAR CEMENTUM It is the first cementum formed, covers approximately the cervical third or half of the root and does not contain cell’s
  6. 6.  This cementum is formed before the tooth reaches the occlusal plane and it’s thickness ranges froms 30 to 230 um Sharpey’s fibers are completely calcified, with the mineral crystals. Oriented parallel to the fibrils as dentin and bone except in a 10 -50 um wide zone near the cementodentinal junction where they are only partially calcified
  7. 7.  Acellular cementum also contains intrinsic collagen fibrils that are calcified and irregularly arranged or parallel to the surface CELLULAR CEMENTUM Celluar cementum formed after the tooth reaches the occlusal plane is more irregular and contain cell’s (cementocytes) in individual spaces (lacunae)
  8. 8. that communicate with each other through a system of anastomising canaliculi Cellular cementum is less calcified than the acellular type Sharpey’s fibers occupy a smaller portion of cellular cementum and are separated by other fibers that are arranged either parallel to the root surface Both acellular and cellular cementum are aranged in lamellae separated by incremental lines parallel to long axis root this lines are called rest periods
  9. 9.  PERMEABILITY OF CEMENTUM In very young animal’s acellular cementum and cellular cementum are very permeable and permit the diffusion of dyes from the pulp and external root suface THICKNESS OF CEMENTUM Cementum deposition is a continuous process that proceeds at varying rates
  10. 10.  Cementum formation is most rapid in the apical regions where it compensates for tooth eruption, which it self compensate for attrition The thickness of cementum on the coronal half of the root varies from 16-60um It attains greatest thickness (upto 150-200 um) in the apical third and in the fraction areas Abnormalities in the thickness of cementum may range from an absence of cellular cementum to an excessive deposition of cementum
  11. 11.  The term hyper cementosis refers to a prominent thickening of cementum Hyper cementosis occurs a generalisied thickening of the cementum CEMENTUM RESORPTION AND REPAIR Cementum resorption may be caused by local and systemic factors
  12. 12.  Local condition causing cementum resorption include trauma from occlusion orthodontic movement pressure from malaligned erupting teeth cysts and tumors teeth with out junctional antagoinsts Systemic condition citied as predisposing to or including cemental resorption include calcium deficiency hypothyroidism, hereditary fibrous osteodystrophy
  13. 13.  EXPOSURE OF CEMENTUM TO ORAL ENVIRONMENT Cementum becomes exposed to the oral environment in cases of gingival recession and as result of loss of attachment in pocket formation CEMENTO ENAMEL JUNCTION The cementum at and immediately subjacent to cemento enamel junction is of particular clinical importance in root scaling procedures
  14. 14.  Three types of relationships involving the cementum may exists at cementoenamel junction in about 60 -65% of cases, cementum over laps the enamel in about 30% an edge-edge but joint exists and 5-10% the cementum and enamel fail to meet CEMENTO DENTINAL JUNCTION The terminal apical area of cementum where it joins the internal root canal dentin is known as cemento dental junction
  15. 15. THANK YOU GUIDED BYDR. KRISHNA MOORTHY. MDSDR. ROOPA DEVI. MDSDR. RAVEENDHAR REDDY. MDSDR. SHARATH. MDSDR.VENKAT SUBBA REDDY. MDS SUBMITTED BYDR. PRADEEP. MDS N.V.GAYATRI SAROJINI IV BDS
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