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Cementum, how thick?
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Cementum overlap enamel in %
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CEMENTUM
| Question | Answer |
|---|---|
| Cementum, how thick? | Calcified tissue located on the root surface; .05mm (half a millimeter) thick |
| Cementum overlap enamel in % | 60% (enamel forms 1st, can't overlap cementum) |
| cementum and enamel meet in % | 30% ((enamel forms 1st, can't overlap cementum) |
| Cementum and enamel do not meet | 10% ((enamel forms 1st, can't overlap cementum) |
| Statement: Can have all 3 relationships of cementum-dentin on the same tooth | True. |
| Organic portion of cementum composed largely of | Collagen fibers, ground substance and cementocytes (cementum cells) |
| Inorganic portion of cementum composed of | calcified fibrous matrix made of hydroxyapatite crystals |
| Cementum is a product of the | periodontal ligament |
| 2 Types of Cementum | Acellular, cellular |
| Characteristics of acellular cementum | doesnt contain cementocytes; forms slower than cellular cementum |
| What cementum forms faster: cellular or acellular? | cellular forms faster |
| When forming cementum cementoblasts start where... and move where | Cementoblasts adhere to DCJ (Dentinocemental junction) and move outward toward the PDL. As they move outward they leave behind a cemental matrix in layers called lamella |
| Cementoblasts adhere to the DCJ and move outward toward the PDL As they move outward they leave behind a cemental matrix in layers called... | lamella |
| Acellular cementum is usually found in the.. | cervical 1/3 of the root; it is also found on the outer surface of cellular cementum in the very most apical portion of the root |
| Characterize cellular cementum | Cementoblasts surround themselves with the matrix which calcifies, the cells are then called cementocytes |
| In cellular cementum when cementoblasts start being called cementocytes | When cementoblasts surround themselves with the matrix that calcifies, the cells are then called cementocytes |
| Space where cementocyte sits in is called | lacunae |
| The cementocyte has extensions from the cell body called | cytoplasmic processes |
| Cytoplasmic processes | the cementocyte has extensions from the cell body called cytoplasmic processes |
| Cytoplasmic processes sit in spaces called | canaliculi |
| Canaliculi | the spaces where cytoplasmic processes sit. Cytoplasmic processes are extensions of cementocyte's cell body. |
| Cellular cementum is located | in the apical 2/3 of the tooth |
| Cementum is formed in layers called | Lamella |
| Cementum is thicker in areas of cellular or acellular cementum? | Cementum is thicker in areas of cellular cementum |
| Statement: Cellular cementum can sometimes be found on the surface of acellular cementum. | True |
| Cementoid is | layer of cementum that has not completely calcified |
| Where is it located | eventually it is located on the outer surface of root in PDL next to cementum |
| In what field of dentistry is cementum important | orthodontic treatment |
| Why is cementoid important in orthodontic treatment | Due to hypocalcified (low calcified) nature it is not readily absorbed. Cementum is avascular which may account for it’s resistance to resorption – making orthodontic tooth movement possible |
| One of the main responsibilities of cementum is | suspension of tooth in alveolus |
| How long is cementum layed down | throughout the life of tooth |
| Statement: Cementum is layed down throughout the life of tooth | True |
| Cementum can repair itself.. | to a certain extent by the cementoblasts in the PDL (buidling more cementum) |
| If severe pressure applied to tooth from a blow or too rapid orthodontic tooth movement, repair may not be possible and root resorption may occur by odontoclasts | repair may not be possible and root resorption may occur by odontoclasts |
| Hypercementosis | cemental hyperplasia; production of excessive cementum; etiology unlnown; extraction would be difficult |
| Negative effect of hypercementosis | extraction would be difficult |
| Cementicles | Small bodies of cementum in PDL or attached to root surface formed from cellular debris in PDL No clinical significance |
| Small bodies of cementum in PDL or attached to root surface formed from cellular debris in PDL | Cementicles |
| Cemental caries aka | root caries |
| Cemental/ root caries often seen in | geriatric patients (geriatric - людей пожилого и старческого возраста) |
| Cemental/ root caries develops if | If recession has occurred and root surface exposed to oral fluids and the accompanying bacteria, cemental caries can occur Root surfaces that have been exposed due to recession are also likely to experience abrasion and/or dentinal hypersensitivity |
| Root surfaces that have been exposed are also likely to experience | abrasion and/or dentinal hypersensitivity |
| What cells resorb cementum? | odontoclasts (cells of dentin) |
| Cementoid resistant to resorption due to its | avascularity (lack of blood vessels) |
Created by:
EdmondDantes