Gingiva Histology Revision.pdf

Histology of the gingiva  Healthy gingiva = stippled 'knife-edge'...

Histology of the gingiva  Healthy gingiva = stippled 'knife-edge' appearance. gingival Junctions m · : Oral epithelium : stratified squamous - Keratinized. Outer surface of free and attached gingiva. · Extends from ; crest of gingival margin > mucogingival - junction. Retepegs : provides strength support to undergo external forces. · + · Keratinized for protection from mechanical stress and trauma. ↑ layers 1 Basal cell cube shaped. :. : 2 Prickle Cell spine shaped. :. 3. Granular cell : flattened with increased Keratin. 4. Keratinized cell flattened with extensive Keratin. : · sukcular epithelium Stratified squamous-non-keratinized :. faces tooth surface but not in contact ; free gingiva. · Semi-permeable ; allows gingival crevicular fluid * to flow from tissue - sulcus. · No rete or Keratinized epithelium. (G(f) pegs Harbouring ground for bacteria. · · 3 layers : 1. Basal cell : cube shaped.. Prickle cell 2 : spine shaped.. 3 Superficial cell Junctional epithelium Stratified squamous-non-keratinized. : · Joins gingiva to tooth. and Coronally : 15-30 cells thick Apically ; 4-Scells thick ·. closely packed epithelial cells joined by desmosomes. Hemidesmosomes join epithelial cells to basal lamina ·. Internal basal lamina ; thin extracellular matrix between epithelial cells · , tooth surface. · External basal lamina : thin extracellular , matrix between epithelial cells and gingival connective tissue. 3 layers. 1 Basal cell cube. : shaped 7 Prickle cell : spine shaped. 3. Tooth.  functions of junctional epithelium : Attachment : Barrier: Host response : (Hemidesmosomes) (4-Scellsthick (GCF white blood , , Desmosomes) cells , antibodies. Gingival connective tissue : · Also known as Lamina propria. · Free and attached gingiva. · Provides solidity to gingiva through dense network. · Attaches gingiva to cementum of root and alveolar bone. · Transportation within matrix (water. , nutrients etc). Host response-immune. Supragingival fibres : · Elastic and collagen fibres. · keep gingiva upright. · Act as a brace to withstand forces in different directions. Inflammation causes a decrease in density. Supragingival fibres AG Alveologingival Alveolar crest to gingival connective tissue C Circular Ring round coronally above crestal bone DG Dentogingival Cementum fan into gingival connective tissue PG Periosteogingival Fan from periosteum IG Intergingival Mesiodistal direction along whole dental arch linking teeth together IC Intercircular Encircle several teeth linking teeth together IP Interpapillary Located in the papilla connect oral & vestibular papilla TG Transgingival Cementum to CEJ and run horizontally linking teeth together TS Transeptal Cementum of one tooth to another tooth over crestal bone