Oral Biology Unit 2 Test

Components of periodontium

Gingiva, cementum, PDL, alveolar bone

Gingiva

Attaches to underlying bone, surrounds the cervix and fills inter proximal space

3 parts of the gingiva

free gingiva, interdental papilla, attached gingiva

Free gingiva 

not attached to the underlying bone, forms a sulcus space between gingiva and tooth

Free gingival groove 

A shallow groove that separates free gingiva and attached gingiva 

Groove runs parallel to gingival margin

Gingival margin

edge of the gingiva nearest to the crown of the tooth 

marks the opening of the gingival sulcus

Gingival sulcus (crevice)

space between the free gingiva and tooth

Attached gingiva

Adheres tightly to bone beneath it

Merges with alveolar mucosa at mucogingival junction

stippled 

Alveolar mucosa 

movable tissue attached to underlying bone 

non-keratinized thin epithelium

not on palate

Interdental papilla

occupies interproximal areas between two adjacent teeth in a healthy mouth

Col

Depression between lingual and facial papilla

Junctional epithelium

Provides a seal at the base of the sulcus

cuff like band that attaches to cementum in a healthy gingiva

1 mm below CEJ

Mucogingival junction 

attached gingiva meets with alveolar mucosa

found on facial surface of all quadrants and lingual surface of mandibular arch

no mucosa on palate

Cementum 

attaches tooth to bone by means of periodontal ligament 

Compensation

Formation of secondary cementum

periodontal ligament

soft CT that surrounds the root of tooth

surrounds the root of the tooth

comprised of fibers, ligaments that suspend tooth in alveolus

connects to alveolar bone

vascular 

Functions of PDL

formative 

supportive 

protective 

sensory 

nutritive 

resorptive 

5 Sharpey’s fibers PDL