Dr. Muroff - Trip Down the Root Flashcards
4 histologic zones in periodontal disease
- Zone of infection
- Zone of contamination
- Zone of irritation
- Zone of stimulation
Define zone of infection
Microorganisms and PMNs replace normal cells
Define zone of contamination
Toxins of dead cells and bacteria - plasma cells and lymphocytes replace most normal cells
Define zone of irritation
Histiocytes & osteocytes predominate to distance source from rest of tissue - some normal cells remain > open gap to prevent wide-spread necrosis
Define zone of stimulation
Toxins attenuated to stimulate fibroblasts & osteoblasts to wall off source of irritation and form new bone
Color of healthy gingiva
Pale pink but racial pigmentation variation possible - clearly define from redder A.M.
Density of healthy gingiva
Firm, tough, matte, non-shiny, stippled
Crevice depth of healthy gingiva
1 - 3 mm
Form of healthy gingiva
- Surface contour reflects bone contour
- Root prominence
- Interproximal depression apical to papilla = gingival festooning
3 gingival components
- Marginal (free) gingiva
- Attached gingiva
- Gingival papilla
Define the marginal (free) gingiva
Parabolic curve under greatest cervical contour of tooth - to protect and maintain thin knife-like gingival margin - not bound to underlying bone
Criteria for attached gingiva
Must be wide enough to adequately separate free gingiva from alveolar mucosa
Describe the gingival papilla
Fills interproximal area - margin follows CEJ meeting margin of adjacent tooth apical to contact. Tip more coronal than facial and lingual gingival margins
Number of central peaks of anterior gingival papilla
1
Number of peaks in posterior gingival papilla
2 peaks joined by concave knife edge = col. Due to more convez proximal contour and larger contact
Location of earliest gingival inflammation
The Col
Describe the histology of the col
Connective tissue of col covered only by thin layer of junctional epithelium (odontogenic epithelium) for some time after eruption, before being replaced by more protective oral E. from buccal and lingual peaks
