What makes up the masticatory mucosa?
-keratinized stratified squamous epithelium -Dorsum of tongue, hard palate, and attached gingiva
what is the lining of the mucosa made up of?
-non-keratinized stratified squamous epithelium -buccal mucosa -labial mucosa
what is the specialized mucosa component of the oral mucosa?
-dorsum of the tongue
-taste buds, lingual papillae
which 3 mucosa make up the oral mucosa
-masticatory mucosa -lining mucosa -specialized mucosa
what are 2 histologic features of the masticatory epithelium?
-keratinized -rete pegs (rete processes, rete ridges)
what are rete pegs?
-downward thickening of epidermis between the dermal papillae -they function in helping keratinized tissues resist forces during mastication
what 3 main layers comprise the basement membrane?
-basal lamina -attaching proteins -lamina reticularis
the basal lamina consists of the lamina lucida and lamina densa. what are the main molecules in each layer?
lamina lucida: -laminin -integrins -entactins -dystroglycans lamina densa: -collagen IV
what two proteins make up the attaching proteins of the basement membrane?
-collagen VII -fibrillin
what makes up the lamina reticularis of the basement membrane
what are langerhans cells?
antigen-presenting cells that are important for immune system functions
what 4 main components make up the peridontium?
-gingiva -cementum -periodontal ligament -alveolar supporting bone
what are 3 types of gingiva?
-attached -unattached (margina, free) -interdental
T or F: periodontal tissues are biologically interdependent and withstand changes with age and disease.
false: they are subject to variations and changes with age and disease
what 4 tissues does the periodontium NOT include?
-enamel -dentin -pulp -surrounding bone of the alveolar process
what are the 5 main functions of the periodontium?
-attach -resist -maintain -adjust -defend
describe characteristics of periodontium functions
-shock absorber: withstand forces of mastication
-sensory receptor necessary for proper positioning of the jaw
-nutritive: blood vessels provide the essential nutrients to the vitality of the PDL
what are 5 components of the gingival epithlium?
-keratinocytes -desmosomes -tonofilaments -basal lamina -hemidesmosomes
4 anatomical areas of the gingiva
-free gingiva (marginal) -gingival sulcus -interdental gingiva (papilla) -attached gingiva
what is the difference between the gingival sulcus and the periodontal pocket?
-gingival sulcus implies health -periodontal pocket implies disease
what are the gingival boundaries?
-upper (coronal) edge is the gingival margin -lower (apical) edge is the alveolar mucosa
Name these tissues:
what part of the gingival sulcus does the free gingiva form?
soft tissue wall
T or F:
free gingiva tissues meets the tooth in a thin, rounded edge called the gingival margin
what type of tissue makes up the free gingiva?
keratinized stratified squamous epithelium
T or F:
the gingival margin does not follow the contours of the teeth
it follows the contours of the teeth, creating a wavy outline
what are the two gingival biotypes?
compare thin vs thick gingival biotypes
- 1/3 sample, females
- slender teeth
- narrow zone of KG
- 2/3 sample
- quadratic teeth
- wide zone of KG
what is the gingival sulcus?
the space between the free gingiva and tooth surface
what are 4 characteristics of the gingival sulcus?
-V-shaped shallow space around the tooth
-clinically normal sulcus is 1-3 mm as measured by a probe
-base of sulcus is formed by junctional epithelium
-wall of sulcus is non-keratinized