Oral cavity Flashcards
What are the functions of dentition?
- Mastication
2.Speech
3.Aesthetics
How many types of dentition are there?
1.deciduous 20 incisors, canines, molars
- Permanent 32 incisors canines premolar and molars
What are the functions of the teeth?
1.incisors- biting
2. Canines- tear
3. P/molars + molars - chewing
At how many months does tooth development begin during pregnancy?
6-7 weeks after conception
What are the 3 stages of tooth development?
- Bud- cells group and swell : enamel organ (1 per tooth)
- Cap- enamel organ enlarge and concave(inner and outer epithelium) and dental pulp. Dental follicle turns into periodontal ligament.
- Bell- enamel organ splits to layers to make parts of the teeth.
What are the deciduous teeth eruption dates?
- AB (INC) 6-12
- D (1ST MOL) 12-24
- C (K9s) 14-20
- E(2nd Mol) 18-30
Nmeonic - AB6-12 D12-24 C14- 20 E 18-30
Permanent teeth eruption dates
6= 5-8
#1=7-8
#2=7-10
#4= 9-13
#3= 9-14
#5&7= 10-14
#8= 17-24
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What provides attachment to periodontal ligament?
Alveolar bone
What is the make up of enamel?
96% inorganic
4% organic
Hardest in body
Hydroxyapetite crystals
What is the make up of cemented?
45% inorganic hydroxy
55% organic collagen + water
Attaches to perio ligament
What is the make up of dentine?
70% hydroxy inorganic
30% water+ collagen organic
.Largest part of tooth
.Tiny tubules
.Sensitive to hot cold sweet
.Can lay down secondary dentine.
What are small pulp projections towards cups called?
Pulp horns
What is the fifth cusp called on upper 1st premolars(rare)?
Cusp of carabelli
What is the hall technique in dentistry?
Caries is covered with a crown using glass ionomer to arrest caries.
What are the 4 parts of the periodontium?
Gingivae
Cementum
Alveolar bone
Periodontal ligament
How many components make up the gingivae?
- Attached gingivae (stipled , covers bone at neck of teeth.
- Free gingival margin( meets the tooth, scalloped around tooth)
- Mucogingival junction( separates attached from mobile)
- Gingival crevice ( inner part of free gingival margin) 3mm in depth,
What is the shock absorber of the teeth?
Periodontal ligament
What are some functions of saliva?
- Buffer
2.lubricate - Mastication
- Deputation
- Taste
- Antibacterial
- Hydration
What is saliva made of?
99.5% water
0.5% :
1.enzymes(amylase,lysosome)
2. Mucin
3. Serum protein
4. Waste products
What is the largest salivary gland with 25% saliva volume?
Parotid (back of jaw)
Parotid duct/ stepsons duct
Which gland is located at the Base of mandible and produces most saliva 60-65%?
Submandibular gland
Which gland is the smallest producing 10% saliva?
Sublingual gland
What is the normal salivary flow per day?
0.5-1.5 liters per day
What is plaque made of?
Microorganisms :BFVP
Intercellular substances
