DHE119 Continue Chapter 2 Quiz3

• 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

• Extend from periosteum of alveolar crest into gingival connective tissue
• Fiber bundles attach gingiva to bone

• 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
• 

• Embedded in cementum near CEJ
• Fan out into lingual connective tissue
• Fibers act to attach gingiva to teeth
• 

• Extend laterally from periosteum of alveolar bone
• Fibers attach gingiva to bone
• 

• 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
•  

• Encircle several teeth
• Fiber groups link adjacent teeth into a dental arch unit
• 

• Located in papillae coronal to transseptal fiber bundles
• Fiber groups connect oral and vestibular interdental papillae of posterior teeth
• 

• Extend from cementum near the CEJ and run horizontally between adjacent teeth
• Fiber bundles link adjacent teeth into a dental arch unit
• 

• 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
• 

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
• 

• Thin sheet of fibrous connective tissue located between the tooth and its bony socket
• PDL connects to tooth and bony wall of tooth socket

• -Cells:
•   Fibroblasts
•   Cementoblasts
•   Osteoblasts
• -Extracellular matrix
• -Blood vessels
• -Nerve supply

• 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

• 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

Specialized connective tissue surrounding tooth root that connects it to alveolar bone

1.Alveolar crest

2.Horizontal

3.Oblique

4.Apical

5.Interradicular

• Extend from cervical cementum
• Run downward in diagonal direction to alveolar crest
• Fiber group resists horizontal tooth movements

• 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

• 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

• 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

• 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

cementum and alveolar bone

• 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
• 

Calcified layer of connective tissue that covers root of the tooth

• 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

• Organic matrix: Densely packed collagen fibers held together with gel matrix
• Mineralized portion
• No blood vessels or nerves

• 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

• 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

• overlap
• 

• meet
• 

• gap
• 

Bone of upper or lower jaw that surrounds and supports the roots of teeth

• Forms the bony sockets of teeth
• Supports and protects roots of teeth

• 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

bone builders initiate mineralization of bone

bone consumers remove mineralized material and organic matrix

• collagen fibers and?
• gel-like matrix
• Mineralized portion is calcified by depositing mineral salt hydroxyapatite

• Osteoblasts
• Osteoclasts
• Extracellular matrix
• Blood and lymph vessels
• Nerves