Histology of Gingiva PDF

Histology of the Gingiva · protects dentin PERIODONTIUM: - provides attachment to the collagen fibres present in the periodontal...

Histology of the Gingiva · protects dentin PERIODONTIUM: - provides attachment to the collagen fibres present in the periodontal ↓ ligament "Shockouber" - ther noedstwin - Alveolar mucosa Mucogingival junction alreotar bone) Attached gingiva (to Free gingival groove Free (not attached > - bacterial gingiva Interdental papillae (A, stops food paction) THE GINGIVAL COL The zone in which twoadjacent teeth appear to meet Thedepressio, n papillae DENTOGINGIVAL JUNCTION SEPITHELIUM) ⑫eliu ⑳ X ⑧ * Cell layers : kL Gh PL · Kh Keratinised cell Layer Sh · GL Granular cell Layer BL · PL Prickle cell Layer · SL Superficial All Layer · BL Basal cell Layer P  Oral Epithelium : The oral epithelium covers the outer surface of the free gingiva and attached gingiva. It extends from the crest of the gingival margin to the mucogingival junction. The oral epithelium is the only part of the periodontium that is visible to the unaided eye Stratified squamous epithelium Keratinized cell layer (tu · flattenedcells with extensive intracellular Keratin E starker E granularcelllayer increas. Prickle · cell layer Spine-like cells with large intercellular spaces& E , BasalCella a The cells of both layers attach to each other with DESMOSOMES. 3 S purps  Sulcular Epithelium : # Epithelium that faces the tooth surface : without being in contact with the tooth surface Thin Nonkeratinized Without rete pegs (In health, the sulcular epithelium joins the connective tissue at a smooth interface with no epithelial ridges (no wavy junction) v Semipermeable (but less so than JE) allowing fluid to flow from the gingival connective tissue into the sulcus. This fluid is known as the gingival cervical fluid (GCF) & Bacteria can be present functional Epithelium IJE) : Stratified squamous non-keratinized epithelium Joins gingiva to tooth surface ↳ Length 0.71 - 1.35mm High cell turnover The body is covered by continuous sheet of epithelium Teeth penetrate this sheet by eruption thus creating an opening The body attempts to seal the opening by attaching epithelium Junction = connection  Microscopic anatomy of JE : closely packed epithelial alls · connected to neighbouring by cells · DESMOSOMES (cell junction) Internal basal Lamina-thin layer of · extracellular matrix between epithelial cells and tooth surface · External basal lamina-thin layer of extracellular matrix between epithelial cells and gingival connective tissue · Attachment to tooth surface is by HEMIDESMOSOMES celljunction) · S-10 hemidesmosomes per micron at the coronal end and 2 per micron at apical end Attachment to connective tissue 6 & · hemidesmosomes & external is by basal lamina - G attachmentfounderlying alls attached eac thea Cell Junctions : DESMOSOME-celljunction that connects two neighbouring epithelial cells and their cyreskeletons together HEMIDESMOSOME-connects the epithelial cells to the basal Lamina Functions of JE : · Attachment-hemidsmodomes Barrier-I all turnover, tightlypack · · Host  Gingival Connective. tissue = LAMINA PROPRIA The gingival connective tissue · & Attached of the free gingiva to the provides soliding gingiva and attaches the gingiva to the cementum of the Root and the alveolar bone Functions : 6 Integrity and strength of gingival tissues - dense network & Normal function of connective tissues & The transportation of water, nutrients, metabolites, oxygen, etc., to and from the individual connective tissue cells occurs within matrix & Host response - immune response Supragingival fibres of connective tissue I collagen , elastic  1 p *G (Alveologingival) - alveolar cust to gingival connective tissue & Kircular)-ring round caonally above crestal bone DG (Denrogingival) cementum fan into gingival connective tissue - PG (Periosteogingival) fan from perios - term IG Intergingival) mesiodistal direction along whole dentalarch - linking teeth together IC Intercircular) encircle several terth linking testh together - IP (Interpapillary) in the - & papilla connect Oral Vestibular papilla TG (Transgingival) - Cementum to CEJ and run horizontally linkingteeth together TS (Transeptal) - comentum of one tooth to another tooth over cristal bone 3 mm healthy gingival sulcus · or less · gingival sulcus-U-shape