Supporting Structure Flashcards
Radiologically, alveolar bone called ______.
lamina dura
Alveolar Bone
- forms the tooth socket
- AB + cementum anchors PDL
Alveolar Crest
ridge of alveolar bone that is the coronal border of the alveolar process
wiki- the thickened ridge of bone that contains the tooth sockets (dental alveoli) on bones that hold teeth
The _______ (compact lamellar) plate of bone faces the cheek and lips (buccal).
The _______ (compact lamellar) plate of bone faces the tongue and palate (lingual).
outer cortical; inner Cortical
The cribiform plate (or lamina dura) faces the root of the tooth….
1) Sharpey’s Fibers
2) Volkmann’s Canals
3) Interradicular Alveolar Bone
4) Interdental Alveolar Bone
1) SF- LB + PDL (the CP contains lamellar bone and a layer of bone into which the periodontal fibers insert (SF))
2) VC- opening; openings of CP for blood vessels/ nerves
3) IAB- multirooted; alveolar bone of multirooted teeth: cribriform plates and spongy bone
4) IAB- between teeth; Alveolar bone between teeth: cribriform plates of both teeth and some spongy bone
Both cementum and cribriform plate can show _______ indicating alterations in the deposition of cementum and bone by cementoblasts and osteoblasts, respectively.
arrest lines
Orthodontic Forces: Movement effects the PDL, stretching on one side (________) and compacting on the other (________).
tension zone; compression zone
Orthodontic Forces: Depending upon stresses, bone can undergo both resorption and deposition.
What causes resorption and deposition to occur?
R- Tooth movement toward the cribriform plate stimulates osteoclasts to resorb bone to make room for the new position of the tooth (resorbed area= resorption lacuna)
D- Tooth movement away from the cribriform plate stimulates osteoblasts to lay down new bone, filling in the space left by the repositioning of the tooth.
What are 2 major types of PDL fibers? What does interstitial spaces refer to?
- gingival fibers and principal fiber bundles (designation related to location, not appearance)
- Between fiber bundles—loose connective tissue called interstitial spaces, contains vasculature and nerves
Gingival Fibers (4)
1) Dentogingival F.- from cervical cementum to free gingiva + lamina propria of gingiva
2) Dentoperioseal F.- from CC over aleolar crest to cortical plates
3) Transseptal Fibers- cementum of tooth> adjacent tooth> over AC
4) Circular Fibers- around cervical part of root + inserts into cementum & LP of gingiva and AC
Principle Fibers (5)
1) Alveolar Crest F- from cervical cementum into alveolar crest (resists horizontal movement)
2) Horizontal F- right angles to long axis of root from alveolar bone to cementum (resists horiz. mov)
3) Oblique F- from cementum to Alveolar bone (most abundant; resists compressing)
4) Apical F.- apical cem into AB (stabilizes)
5) Inter-Radicular F- cementum into furcation area of tooth to IR AB (stablizes; multiroot teeth)
Circular Fibers/ Alveolar Crest/ Apical Fiber/ Transseptal Fibers function
- Circular fibers resist rotational movement of the tooth.
- Alveolar crest and apical fibers resist pull of the tooth from its socket.
- Transseptal fibers connect all teeth and maintain integrity of the dental arches.
Sharpies Fibers of PDL
found on both sides of PDL; inserts into the cribiform plate and the cementum
What supports principal fibers?
Oxytalan Fibers; appears in larger numbers when PDL has increased stress
Vssels in PDL and bone interconnected via openings in cribriform plate, called _______.
Volkman’s canals
