Ex 2- Periodontium 1- Development Flashcards
(37 cards)
What structures does the periodontium include?
cementum PDL bony socket gingival facing tooth: --junctional epithelium --sulcular epithelium
______ is a calcified material that covers the root dentin
cementum
______ ______ is largely composed of collagen fibers which are embedded on one end into the cementum and on the other the bony socket housing the tooth
periodontal ligament
All of the structures of the periodontium serve s an attachment apparatus for the tooth except _______ ______
sulcular gingiva
Tooth root develops _______ the crown
after
_____ ______ ____ _____ (____) guides the growth of the root
Hertwig’s epithelial root sheath (HERS)
The initiation of root dentinogenesis slightly precedes _______ development
periodontal
The inductive signal from HERS for odontoblast differentation is _________ and/or _______
TGF-B and/or laminin5
Once dentin in the root begins to be laid down, _____ separates from root dentin. Cells migrate to root dentin to become _________, to site of future tooth socket to become ______ and to the future PDL to become ________
HERS
cementoblasts
osteoblasts
fibroblasts
______ & ________ secrete their organic matrix composed primarily of type I collagen then the ______ _______ secrete their own organic collagen matrix
Cementoblasts & osteoblasts
PDL fibroblasts
The organic matrices of cementum and bone are secreted before _________ begins
mineralization
As the PDL fibers are secreted they intermingle in _________ matrices then become entrapped in those matrices during ______ in the cementum on one side and the alveolar bone on the other
unmineralized
mineralization
All of periodontal development, including PDL development, is occurring as the tooth is ______
erupting
As the tooth is erupting, _______ fibers of the PDL get added apically, the ______ of PDL fibers also change
collagen
orientation
Collagen fiber bundle starts in an ______ orientation with ends embedded in the cementum more ______ positioned. Then to a more _________ position, then _____ again with the cementum more ______
oblique apically horizontal oblique coronal
The periodontium growth proceeds from the _____ to the ______ ______ occurring simultaneously with eruption. 2 processes are coordinated and slow
CEJ
root apex
_______ cementum is the first type of cementum formed, mainly acellular, located on coronal ____ of root
Primary
2/3
________ cementum is fromed after @ least ____ of the root is formed to the time the tooth emerges in the oral cavity, mainly cellular, located on apical ____of root
secondary
1/2
2/3
_________ cementum is most important in serving an attachment function
primary
The 2 types of cementum overlap in the ______third of the root, with _____ cementum overlying ______ cementum
middle
secondary
primary
Along the advancing root edge, there is the continuous stretch of predentin extending btw the future _____ and the _____
DCJ
pulp
A little coronal to the tip of the developing root, the root dentin starts to _______ creating _____, separate ______parts of dentin: the ______ adjacent to the pulp and another region at the future _____
mineralize two unmineralized predentin DCJ
_____ ______ a dense group of collagen fibers oriented at _______ angles to the DCJ
fiber fringe
right
The fiber fringe extends into the _______ ______ ____ . Upon mineralization the fiber fringe is embedded within the mineralized dentin matrix
unmineralized dentin matrix
