08/27 - Anatomy of the Periodontium Flashcards
What are 2 other names for the periodontium?
- attachment apparatus
- supporting tissues of the tooth
What are the 2 functions of the periodontium?
- attach the tooth to bony tissue of the jaw
- maintain integrity of masticatory mucosa
Development of the periodontia occurs early in the ___ phase along with ___ development.
- embryonic phase
- tooth development
During periodontia development, cells originate from the ___ and migrate into the ___. These cells form ___ beneath the stomadeal epithelium. The stomadeal epithelium releases factors which initiate ___.
- neural crest
- first branchial arch
- ectomesenchyme
- epithelial-ectomesenchymal interactions
The dental lamina forms what 3 stages?
- bud stage
- cap stage
- bell stage
During embryogenesis, ectomesenchyme condenses around ___ to form the ___ and the ___.
- dental organ
- dental papilla
- dental follicle
What does the dental papilla give rise to? What does the dental follicle give rise to?
- gives rise to dentin and pulp
- gives rise to periodontium
What does the dental papilla determine?
shape and form of the tooth
During embryogenesis, what part of the tooth forms first?
crown
During embryogenesis, the outer and inner enamel epithelium proliferate apically to form ___. Odontoblasts form ___. Inner cells secrete ___. The root sheath fenestrates so that ___ cells contact the root surface. ___ induces differentiation of these cells into cementoblast. Cemtnoid forms. Fibers of the cementoid intermingle with immature dentinal fibers.
- Hertwig’s Epithelial Root Sheath
- dentin
- enamel-related proteins (amelogenins)
- ectomesenchymal cells
- amelogenin
Periodontal ligament is formed by ___ that are differentiated from the dental follicle lateral to the cementum.
fibroblasts
Osteoblasts differentiate from ___.
dental follicle ectomesenchymal cells
True or false: Ectomesenchymal cells remain in mature periodontium and participate in turnover.
true
What is the definition of gingiva?
part of the masticatory mucosa which covers the alveolar process and surrounds the cervical portion of the teeth
What are the 3 parts of the gingiva?
- free gingiva
- attached gingiva
- interdental papilla
What are other names for free gingiva? It extends from ___ to ___. Is it keratinized?
- gingival sulcus, marginal gingiva, sulcus depth
- from free gingival margin to free gingival groove
- yes, it is keratinized
Where is the free gingival margin located?
on the coronal end of the gingiva, 1.5-2.0 mm coronal to the CEJ
What is the free gingival groove? How prevalent is it?
- junction between free and attached gingiva; corresponds to CEJ
- only found in 30-40% of adults
The oral epithelium faces ___. The oral sulcular epithelium faces ___. The junctional epithelium provides contact between ___ and ___.
- oral cavity
- tooth surface without contacting it
- gingiva and the tooth
What are the macroscopic limits of the free (marginal) gingiva? What are the microscopic limits? Why does it matter?
- extends from FGM to FGG
- extends from FGM to JE
- because how these landmarks change from health to disease will determine the accuracy of your probe readings
Describe the texture, color, and mobility of attached gingiva. How often is stippling present?
- firm texture
- coral pink
- immobile
- 40% of adults present stippling
How does the width vary in attached gingiva?
- increases with age (passive eruption)
- widest in incisors, narrowest in premolars
- mandibular lingual: narrowest in incisors, widest in molars
What is the definition of the mucogingival junction? Where is the mucogingival junction not present?
- junction between attached gingiva and alveolar mucosa
- not in the palate
True or false: The absence of stippling in the gingiva indicates disease.
FALSE: the presence of stippling is an indication of health, but its absence does not mean anything
