Term
| Does cementum or bone resorbe faster? |
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Definition
| bone, thats why orthodontics work |
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Term
| What can result is external resoprtion of cememtum? |
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Definition
| end to end or edge to edge bite, a lot of force |
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Term
| What is hypercementosis? How does it look on radiographs? |
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Definition
| cememtoblasts make extra cementum, shows up like opaque layer around roots |
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Term
| When is hypercememtosis seen? |
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Definition
| in infraverted teeth because it is not receiving any pressure, wants to move up to look for antagonist |
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Term
What happens to cementum under pressure?
Not under pressure? |
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Definition
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Term
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Definition
| undifferentiated mesenchymial cells in the PDL |
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Term
| What is the alveolar bone? |
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Definition
| the part of the maxilla or mandible that supports teeth, contains roots of teeth |
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Term
What percent of alveolar bone is...
mineralized
organic
water |
|
Definition
Mineralized- 60%
Organic- 25%
water- 15% |
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Term
| What types of lines does alveolar bone show that proves its constant remodeling? |
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Definition
| arrest and reversal lines |
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Term
| What is below the alveolar bone? What does it form? |
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Definition
| the basal bone forming the body of the mandibular or maxilla |
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Term
| What are the two divisions of the alveolar bone? |
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Definition
1.alveolar bone proper
2.supporting alveolar bone |
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Term
| What is the alveolar bone proper? |
|
Definition
|
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Term
| What type of bone is alveolar bone proper composed of? |
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Definition
|
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Term
| What does the alveolar bone proper contain? |
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Definition
1.numerous holes for fibers(Sharpeys)
2.volkmans canals (vascular) |
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Term
| What degree do Shapery's fibers inset at? |
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Definition
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Term
| What is another name for the alveolar bone proper? How does it show up on radiographs? |
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Definition
| lamina dura, readiopaque(white) |
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Term
| How do the lamina dura appear on radiographs? |
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Definition
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Term
| How does the lamina dura appear in tension? |
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Definition
|
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Term
| What type of bone is supporting alveolar bone? |
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Definition
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Term
| What does cortical bone consist of? |
|
Definition
| compact bone plates on the facial and lingual |
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Term
| What does trabecular bone consist of? |
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Definition
| cancellous bone located between the alveolar bone proper and cortical plates |
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Term
| What does the thickness and contour of bone depend on? (3) |
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Definition
1.position of teeth in the arch
2.angulation of the roots
3.types of forces put on the teeth |
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Term
| What can torsiversion cause in bone thickness? |
|
Definition
| can cause it to be thicker in some places and thinner in others |
|
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Term
| What does clenching cause? |
|
Definition
|
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Term
| What causes denuded bone? (2) |
|
Definition
1.angulation of roots
2.position of teeth int he arch |
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Term
| What are isolated areas of denuded bone called? What does it look like? |
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Definition
| fenestration, marginal bone intact |
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Term
| What is a denuded area where the marginal bone is also denuded? |
|
Definition
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Term
| If you have no attached gingiva then you have.. |
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Definition
|
|
Term
| What is the periodontal ligament? |
|
Definition
| fibrous CT that is continuous with the lamina dura of the gingiva |
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Term
| What is the difference between the lamina propria and PDL? |
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Definition
| same thing, just different locations |
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Term
|
Definition
| provides attachment of the teeth to bone |
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Term
| How does the PDL appear on radiographs? |
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Definition
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Term
| What are the 6 functions of the PDL? |
|
Definition
1.attachment apparatus
2.transmists occlusal forces from teeth to bone
3.protects nerves and blood vessels from injury
4.repair and resorption of tissues
5.nutritional support
6.sensory |
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Term
| What are the 6 components of the PDL? |
|
Definition
1.intercellular substance(space)
2.cells
3.fibers
4.blood vessels
5.lymph vessels
6.nerve supply |
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|
Term
| Is the PDL well vascularized? |
|
Definition
|
|
Term
| What makes up the majority of cells in the PDL? |
|
Definition
|
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Term
| What are some other types of cells found in the PDL? |
|
Definition
-cementoblasts
-osteoblasts/clasts
-odontoclasts
-undifferientated mesenchymal cells
-epilthelial rests of malassez
-WBC |
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Term
| What are the 5 different fiber groups found int he PDL? |
|
Definition
1.alveolar crestal
2.horizontal
3.oblique
4.apical
5.interradicular |
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Term
| Where are interradicular fiber groups found? WHat do they attach? |
|
Definition
-cementum to cementum between bifricated roots
-resist vertical and lateral movement |
|
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Term
| What are all groups of fibers of the PDL insert into bone and cementum with? |
|
Definition
|
|
Term
| What do horizontal group fibers do? |
|
Definition
| help resist horizontal and tipping forces |
|
|
Term
| What do oblique fibers do? |
|
Definition
-majority of fibers(80%)
-resists vertical and intrusive forces |
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|
Term
| What do the apical group of fibers do? |
|
Definition
-resist vertical forces
-protect blood and nerve supply so they don't get compressed from intrusive forces |
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|
Term
| Where are gingival fiber groups found? |
|
Definition
| in the lamina propria of the gingiva |
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|
Term
| Do gingival fiber groups support the tooth? |
|
Definition
|
|
Term
|
Definition
| the marginal gingival tissues to maintain their relationship to the tooth |
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Term
| What are the 5 gingival fiber groups? |
|
Definition
1.alveologingival
2.circular
3.dentinogingival
4.periodtogingival(same as alveolar crestal)
5.transseptal |
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|
Term
| What do alveologingival fibers do? |
|
Definition
| come off of bone and up into free gingiva, help pull down free gingiva |
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|
Term
| What do circular fiber groups do? |
|
Definition
| go around root to hold gingiva |
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Term
| What do dentogingival fibers do? |
|
Definition
| radiate out from tooth into lamina propria |
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|
Term
| What do periostogingival fibers do? |
|
Definition
| resist tooth separation mesially or distally, extends from cervical tooth to tooth next to it |
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Term
| Where is the width of the PDL wider? |
|
Definition
|
|
Term
| What does the width of the PDL depend on? |
|
Definition
| the amount of stress a tooth is under |
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|
Term
| What does a mesial drift cause to happen to the PDL? |
|
Definition
| the mesial side to be thinner than distal |
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Term
| A tooth not in function will have a BLANK PDL, a tooth under abnormal stress will have BLANK PDL |
|
Definition
not in funtion=thinner
under stress=thicker |
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