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26 Cards in this Set
- Front
- Back
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Ameloblasts are involved in producing the enamel matrix by producing which two organic components?
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Amelogenin
Enamelins |
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The organic matrix created by ameloblasts make up about _____ of enamel, and water makes up about _____.
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1-2%
4% |
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What property of enamel allows fluoride ions to be absorbed on the hydroxyapatite crystals?
What does this form? |
Semipermeable
Fluorapatite |
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Why does a tooth become more resistant to bacteria producing acids because of fluorapatite?
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Hydroxyapatite has a higher solubility than fluorapatite
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Why is enamel harder than bone?
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Hydroxyapatite crystals are larger and more tightly packed
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What is the general shape of hydroxyapatite crystals?
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Keyhole-shaped rods or enamel prisms
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What are low-molecular weight proteins found in developing tooth enamel, and belongs to a family of extracellular matrix (ECM) protein?
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Amelogenins
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How much of the protein involved in the development of enamel is amelogenins?
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90%
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What comprises <1% of proteins found in developing enamel?
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Enamelins
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What results only if the assault of enamel occurs during the time the teeth are developing?
What dentition is involved? |
Hypoplasia
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What is the appearance of hypoplasia?
What is their radiographic significance? |
Pitted, yellow to dark brown with open contacts
Enamel appears absent or extremely thin. |
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What is a defect in the mineralization of the formed enamel matrix?
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Enamel hypocalcification
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What are the three bacteria in the oral cavity that are resistant to an acidic environment and progress caries?
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S. Mutans
lactobacillus A. Viscosus |
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What are the structural component of plaque?
How are they formed? |
Extracellular Dextrans (essential for cariogenicity)
From Sucrose by bacterial enzymes |
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What is the basic secretory unit of the salivary glands?
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Acini
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What glands produce a serous watery secretion?
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Parotid
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What glands produce a mixed serous and mucous secretion?
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Submandibular
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What gland secretes saliva that is predominately mucous in character?
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Sublingual
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What do mucous secretions contain?
What do they do? |
Mucins
Lubricates the mouth and food |
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What do serous secretions contain?
What do they do? |
Salivary amylase
Splits starches into alpha-dextrans, maltotriose, and maltose |
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What type of stimulation increases saliva production?
What is used as a blocker against this causing dry mouth? |
Vagel stimulation
Atropine |
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What are the ions that reside within saliva?
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Sodium, Potassium, chloride, bicarbonate
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What are the primary organic components of saliva?
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Lingual lipase
Mucopolysaccharides Proline-rich glycoproteins |
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What are the organic components of saliva that are found in smaller amounts?
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IgA
Lysozyme Lactoferrin Albumin Urea Glucose |
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What does saliva supply to the teeth that is important for remineralization?
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Calcium and phosphate
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What is the salivary flow rate which is associated with high caries risk?
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0.7 mL/min.
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