Home
Flashcards
Preview
DHE119 Continue Chapter 2 Quiz3
Home
Get App
Take Quiz
Create
Automatically remove your image background. Try it now!
https://remove-image-background.com
Function of Fiber Bundles?
Brace free gingiva firmly against tooth
Reinforce attachment of junctional epithelium to tooth
Provide free gingiva rigidity to withstand chewing
Unite free gingiva with cementum of root and bone
Connect adjacent teeth to each other
(gingival fiber group) Alveologingival (AG)
Extend from periosteum of alveolar crest into gingival connective tissue
Fiber bundles attach gingiva to bone
(gingival fiber group)circular
Encircle the tooth in a ring-like manner coronal to alveolar crest
Not attached to cementum of tooth
Fiber bundles connect adjacent teeth to each other
(gingival fiber group)dentogingival
Embedded in cementum near CEJ
Fan out into lingual connective tissue
Fibers act to attach gingiva to teeth
(gingival fiber group) Periostogingival
Extend laterally from periosteum of alveolar bone
Fibers attach gingiva to bone
(gingival fiber group) Intergingival
Extend in a
mesiodistal direction
along entire dental arch and around last molars in arch
Fiber bundles link adjacent teeth into dental arch unit
Wave
(gingival fiber group) Intercircular
Encircle several teeth
Fiber groups link adjacent teeth into a dental arch unit
(gingival fiber group) Interpapillary
Located in papillae coronal to transseptal fiber bundles
Fiber groups connect oral and vestibular interdental papillae of posterior teeth
(gingival fiber group) Transgingival
Extend from cementum near the CEJ and run horizontally between adjacent teeth
Fiber bundles link adjacent teeth into a dental arch unit
(gingival fiber group)Transseptal
Pass from cementum of one tooth over the crest of alveolar bone to cementum of adjacent tooth
Fiber bundles
connect adjacent teeth
to one another and secure alignment of teeth in arch
Biologic Width
The portion of tooth surface covered by junctional epithelium and connective tissue, including supragingival fiber bundles
Space on the tooth surface occupied by the JE and the CT attachment fibers apical to the JE.
Length of junctional epithelium is about 1 mm(health)
Vertical space taken up by supragingival fiber groups is about 1mm in length
Biologic width is an important consideration in design of dental restorations and crowns
Margin of restoration or crown must never be placed so close to alveolar bone that it encroaches on biologic width
Periodontal Ligament (PDL)
Thin sheet of fibrous connective tissue located between the tooth and its bony socket
PDL connects to tooth and bony wall of tooth socket
Components of PDL
-Cells:
Fibroblasts
Cementoblasts
Osteoblasts
-Extracellular matrix
-Blood vessels
-Nerve supply
Components in PDL In Health
PDL surrounds entire tooth root and fills space between root and bony tooth socket
Thickness of PDL varies by age and function:
0.05 to 0.25 mm
Function of PDL:
Attaches tooth to bony socket, Suspends tooth so it does not grind on bone during chewing
Transmits tactile pressure and pain sensations
Supplied with blood vessels that provide nutrients to cementum and bone
Contains cementoblasts that produce cementum throughout the life of the tooth
Contains osteoclasts that can resorb bone and cementum
What do Fiber Bundles of PDL do?
Specialized connective tissue surrounding tooth root that connects it to alveolar bone
name the Fiber Bundles of PDL:5
1.Alveolar crest
2.Horizontal
3.Oblique
4.Apical
5.Interradicular
Fiber Bundles of PDL
Alveolar Crest
Extend from cervical cementum
Run downward in diagonal direction to alveolar crest
Fiber group resists horizontal tooth movements
Fiber Bundles of PDL
Horizontal
Located apical to alveolar crest fibers
Extend from cementum to bone at right angles to long axis of root
Fiber group resists horizontal pressure against crown of tooth
Fiber Bundle of PDL
Oblique
Located apical to horizontal group
Extend from cementum to the bone running diagonally
Fiber group resists
vertical pressures
that threaten to drive the root into its socket
Fiber Bundle of PDL
Apical
Extend from apex of tooth to bone
Fiber group secures tooth in its socket and resists forces that might lift the tooth from its socket
Fiber Bundle of PDL
Interradicular
Only on
multirooted teeth
Extends from cementum in furcation area of tooth to interradicular septum of alveolar bone
Fiber groups help stabilize tooth in its socket
The ends of (Sharpey's fibers) PDL fibers that are embedded in?
cementum and alveolar bone
Sharpey’s Fibers:
Attachment of fiber bundles occur when cementum and bone are forming
As cementum forms, tissue hardens around ends of Sharpey’s fibers, surrounding them with cementum
Same process as bone forms
Cementum:
Calcified layer of connective tissue that covers root of the tooth
Function of Cementum:
Seals and covers open dentinal tubules
Acts to protect underlying dentin
Attaches periodontal fibers to tooth
Forms at apical areas of roots to compensate for loss of tooth tissue caused by attrition
Components of Cementum
Organic matrix:
Densely packed collagen fibers held together with gel matrix
Mineralized portion
No blood vessels or nerves
Acellular Cementum:
First to be formed
Covers cervical third or half of root
Not produced during the life of the tooth
Thickness ranges from 30 to 60 µm(microns)
Consists of mostly Sharpey’s fibers
Cellular Cementum
Contains cementoblasts and fibroblasts within mineralized tissue
Formed after tooth eruption
Less calcified than acellular cementum
Deposited at intervals throughout the life of the tooth
Thickness ranges from 150 to 200 µm
Cemento-Enamel Junction (CEJ)
60% cementum ________enamel
overlap
Cemento-Enamel Junction (CEJ)
30% cementum ________ enamel
meet
Cemento-Enamel Junction (CEJ)
10% ________cementum and enamel
gap
Alveolar Bone:
Bone of upper or lower jaw that surrounds and supports the roots of teeth
Function of Alveolar Bone:
Forms the bony sockets of teeth
Supports and protects roots of teeth
Characteristics of Alveolar Bone:
Mineralized connective tissue made by? osteoblasts
Is rigid because of deposit of calcium salts in extracellular matrix
Has blood vessels and nerves
Constantly undergoes periods of formation and resorption
Components of Alveolar Bone
Osteoblasts:
bone builders initiate mineralization of bone
Components of Alveolar Bone
Osteoclasts
bone consumers remove mineralized material and organic matrix
Components of Alveolar Bone
Extracellular matrix
collagen fibers and?
gel-like matrix
Mineralized portion is calcified by depositing mineral salt hydroxyapatite
Components of Alveolar Bone:
Osteoblasts
Osteoclasts
Extracellular matrix
Blood and lymph vessels
Nerves
Automatically remove your image background. Try it now!
https://remove-image-background.com
Author
dentalhygiene
ID
337744
Card Set
DHE119 Continue Chapter 2 Quiz3
Description
DHE119 Continue chapter2 Quiz3
Updated
2018-02-09T04:27:18Z
Show Answers
Home
Flashcards
Preview