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61 Cards in this Set
- Front
- Back
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Cementum is not laid down until what disintegrates?
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epithelial root sheath
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Precursors of cementoblasts are what type of cells? From what area do they originate?
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fibroblasts, dental sac
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___________ is similar to bone.
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cementoid (cementum)
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Cementum begins being deposited when the tooth is where in position?
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occlusion
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At the time of cementum deposition, how much of the root has already been formed?
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2/3
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T or F: Cementum, like dentin, is laid down and then mineralized.
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True
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What are the black arrows pointing to? From what do they originate?
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epithelial rests; epithelial root sheath
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Acellular cementum is also known as _____________?
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primary cementum
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T or F: acellular cementum thickness has huge variations throughout life?
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False, varies little
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Acellular cementum is found on the (cervical/apical) 1/2 of the root?
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cervical
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Cellular cementum is found on the (cervical/apical) 1/2 of the root?
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apical
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What type of cell does cellular cementum have?
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cementocytes
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T or F: cellular cementum overlaps acellular cementum only at the middle 1/3 of the root?
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True
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Canaliculi in cementum are oriented towards the ____?
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PDL
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What provides nutrients for the cementoblasts?
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PDL
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T or F: Cementum is deposited throughout life and undergoes extensive remodeling?
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False, it is deposited throughout life, but undergoes little remodeling
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What are a-c? Also is the PDL to the left of the bottom picture or to the right? How can you tell?
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a- granular layer of Tome's
b- acellular cementum c- cementocyte PDL is to the left because the processes of the cementocytes project in that direction to recieve nutrients. |
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____________ occur when the cementoblast layer pauses.
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arrest lines
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Arrest lines are ________ calcified.
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highly
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Arrest lines appear (rough/smooth)?
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smooth
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Reversal lines are (more/less) common in cementum than bone?
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less
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Reversal lines are due to ___________ of the cementum.
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remodeling
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Reversal lines are (resistant/conducive) to resorption?
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resistant
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T or F: Like arrest lines, reversal lines are smooth in appearance?
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False, they are scalloped
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What are these lines?
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arrest lines
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What are these concentric circles?
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arrest lines
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T or F: chemicals can be absorbed into cementum?
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True, tetracycline is an example.
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What chemical was absorbed into the cementum in this picture?
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tetracycline
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This picture looks like a tooth in bud stage, but it's not. What is this?
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reversal line in cementum
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Sharpey's fibers are (extrinsic/intrinsic)?
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extrinsic, they are produced outside the tissue
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What are a-c?
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a- dentin
b- cementum c- bone |
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Cementicles are found in the (cementum/dentin/PDL)?
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PDL and cementum
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State the locations of free, attached and embedded cementicles.
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Free are in the PDL. Attached are in the PDL but attached to the cementum. Embedded are within the cementum.
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T or F: cementicles form on debris such as epithelial rests?
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True
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Cementicles resemble (true/false) pulp stones in that they have a ringed appearance?
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false
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What are a and b?
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a- free cementicle
b- attached cementicle |
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Where are enamel pearls located?
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On the outside of the root
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What type of cytodifferentiation goes wrong in order to produce an enamel pearl?
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a fibroblast becomes an ameloblast instead of a cementoblast
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Name the OMG percentages for cementum and enamel.
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overlap - 60%
meet - 30% gap - 10% |
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T or F: if one spot on a tooth has overlap of cementum and enamel, the whole tooth will.
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False, overlap changes from spot to spot on a tooth.
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OMG percentages refer to (surfaces on a tooth/people)?
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surfaces
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T or F: overlap, meet and gap can all occur on the same tooth?
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True
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There are two types of bone around the tooth, what are they?
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alveolar, basal
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Basal bone occurs (above/below) the root?
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below
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T or F: Basal bone is continuous with the jaw bone?
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True
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If a tooth is extracted, __________ bone will be absorbed until only ________ bone remains.
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alveolar, basal
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What are a and b?
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a- cribriform plate
b- bundle bone (thin dark line) |
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Cortical bone is the portion of the alveolar bone which is (next to/away from) the tooth?
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away from
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Cortical bone is comprised of ____________, ___________ bone.
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compact, lamellar
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______________ is the bone socket around the tooth?
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cribriform plate
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T or F: Cribriform plate is a loosely organized bone which allows no communication or passing of nutrients from bone to PDL?
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False, it is compact bone and has numerous openings which allow blood vessels and nerves to pass to PDL
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Where is spongy bone located?
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inbetween cortical and cribriform plates
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What are a-c?
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a- cribriform plate
b- spongy bone c- cortical plate |
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What are a-c?
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a- interradicular bone
b- bundle bone c- cribriform plate |
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What are a-e?
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a- cribriform plate
b- bundle bone c- PDL d- cementum e- dentin |
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What is mesial drift?
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When a tooth moves mesially
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What causes bone remodeling in the tooth socket?
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movement or pressure
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In bone remodeling of the tooth socket, what is the first bone to be broken down?
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bundle bone, it is right next to cementum
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In bone remodeling a cavity is formed and then later filled by new bone. What type of bone is this?
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bundle bone
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In bone remodeling, what type of fibers must be re-anchored?
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PDL
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T or F: bone remodeling applies only to horizontal movement and not rotational movement?
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False, it applies to both
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