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Oral Cavity SG

Oral Cavity

Describe the tissue of the oral cavity The tissue is a mucus membrane and it resembles skin. It is stratified squamous epithelium, not keratinized except for the the lips and tongue. It can become keratinized through trauma.
What places in the oral cavity have a buccal mucosa? The lips, soft plate and floor of the mouth
What places do not have a submucosa? The gingival, hard plate and tongue where the lamina propria is attached directly to the underlying tissue
What type of salivary glands are present throughout the oral cavity? Mucous, serous and mixed
How did the forward part of the oral cavity form? By an in turning of the embryologic ectoderm. There are ectodermal structures found in the anterior portion of the mouth.
What are the subaceous glands found in the skin called in the oral cavity? Fordyce spots
Describe the tongue It is a muscular organ attached posteriorly to the hyoid bone by the hyoglassas muscle, covered by a stratified squamous epithelium
What are the two zones of the tongue? Anterior 2/3: Papillary gland layer and Posterior 1/3: Lymphoid gland layer
What is the division line in the tongue called? Terminal sulcus
Name the four types of papilla of the tongue Filliform (Most common), Fungiform, Circumvallate and Foliate
Describe the filliform papilla Little spikes of tissue and there are no taste buds
Describe the fungiform papilla Knob like structures with taste buds along the superior surface. Little red dots sprinkled along the fungiform papilla
Describe the circumvallate papilla Large and sunk below the level of the surface of the tongue with taste buds along the side. In a row parallel to the terminal sulcus. Surrounded by a trench where fluid is introduced.
Describe the foliate papilla Look like fungiform except taste buds are on the side and not on the top. Not as common in humans, common in animals. Lateral bands of tissue running across the hard plate.
What runs across the hard palate that helps stabilize food so you can turn it over and flip it around? Rugae
What are the initial tooth buds an in turning of? Oral ectoderm
What gives rise to the enamel? Inner dental epithelium. All other structures are mesodermal
After the pre-enamel is laid down what recedes? The ameoblasts and the ameloblastic processes
In mature teeth what is dentin the same calcification as? Bone (About 65%)
How much organic material and calcification make up the enamel? 3-4% organic and 95% calcified. It is the hardest tissue in the body so that we can chew
Where do the odontoblast run? They run through the dentin to the dentinoenamel junction
Do ameloblastic process run all the way to the denitoenamel junction? No, they reced with the ameoblasts
True or False: As the tooth emerges through the gingival, the connection between the tooth and the gingival can be fixed False. It can't be fixed
What is one of the reasons we get oral bacteria in the soft tissue around the tooth? Because the tooth and gingival connection can't be fixed, it can't be tight otherwise the tooth won't erupt.
Describe teething pain Discomfort until the tooth is fully erupted and there is a strong attachment between the gingival and the tooth which is down at the base, at the crown. The erosion of the root of the baby tooth produces pain
What chews away at the primary tooth allowing the permanent tooth to erupt? Osteoclasts
What does the permanent tooth induce the primary tooth root to do? To dissolve
Why would the bone dissolve and the cementum won't? Cementum is much less active and it has a much lower blood supply than the bone
Periodontal Disease The bone is down to the apex of the root. Chronic low grade inflammation that dissolved the bone
Inflammation Space in the tooth gets filled with old foot, plaque, debris junk which causes inflammation and the bone to dissolve
Mandible Implants When the mandible is gone you can't put dentures or implants because the implants are longer than the mandible
Gingivitis Swelling and redness, get bleeding when an instrument is run under the gum
Overt Periodontal Disease Not only redness but there is recession, loss of gingiva and bone, you cannot grow the bone back
Pregnancy gingivitis Overreaction to the presence of plaque due to hormones. Pregnancy tumor: Specific site of pregnancy gingivitis that will correct after birth. (Plaque can be removed to relieve it somewhat)
Stippling Little depressions in the gingival that you only get in healthy gingival. Drug reaction can cause this
Smoking Tobacco can cause... Filiform papilla to pick up the smoke. (Goes away when you stop due to epithelium turnover) Smokers Palate: White keratin, little black dots are openings of the salivary ducts that do not get covered over. Need biopsy to tell if it is pre-cancerous
Geographic tongue Patches on tongue where the keratin has been removed from the filiform papilla
Herpes sore Painful but limited in duration: Goes away in about 2-3 weeks
Carcinomas Squamous carcinomae of the plate and on the lip
Swelling on lip Blocked salivary duct of the salivary glands in the lip. It is usually self-limiting and no treatment is needed
X-Ray The lightest thing on the X-ray is the filing, then enamel, then dentin then pulp
Enamel disruption Sometimes the enamel can be disrupted and the dentin becomes softer. It will wear away and a crown is needed. You can see it clinically because the dentin is yellow and the enamel is white
Tetracycline Used to treat infection but can permanently stain teeth
Nursing bottle mouth Due to prolonged use of a sugary drink
Pointing Swelling due to infection in a tooth and the infection can come out through the bones and the gingiva causing swelling and sometimes decaying



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