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29 Cards in this Set
- Front
- Back
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Researched and recorded information on dental materials.
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18th century Dr. Pierre Fauchard
End of the 19th century G.V. Black |
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Dental materials are regulated and tested by the American Dental Association and the ______________.
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Food and drug administration
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The ADA Council on Dental Materials, Instruments and Equipment is directly responsible for _______________.
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the physical and chemical properties of dental materials.
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ADA Seal of Certification
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Meets established specifications.
Approved by the ADA and U.S. government. |
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ADA Seal of Acceptance
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Materials that have been proven safe and effective.
There are no physical standards or specifications for new types of dental materials. Takes 3 months to complete Process. Awarded for 5 years or until product changes. |
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Cements, Bases, and Liners
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Permanent and Temporary.
Come in powder/liquid, two-paste, capsule, or syringe. Are self-curing (chemical reaction) or light-cured. |
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Direct Restoration
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Placed directly in the mouth in one appointment.
•Amalgam •Composite •Gold foil •Resins (done according to surface of the teeth) |
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Indirect Restorations
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Often requires 2 appointments and a temporary filling.
•Gold Alloy •Porcelian •Resins ◇Inlays or onlays ◇Crown or Bridge |
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Restorative Materials
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Amalgam - silver filling
Composite -white filling Resins - a composite of different materials |
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Terms Used with Dental Cements
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Luting (cementing) - permanent, temporary, and intermediate luting.
Adhesive Bonding Liner Base Sedative or pallative effect Varnish |
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Dispensing Cement Powder and Liquid
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Place powder on preferred hand side of slab.
Separate powder into incraments to prevent contaminatoon of unused powder. After removing air from dropper tip, hold dropper close to and parallel to work surface and dispemse full drops. |
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Care of Equipment
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Equipment must be cleaned immediately by wiping off and washing it.
It may then be sterilized. To remove hardened cements, soak the equipment in sodium bicarbonate, warm water, or orange solvent. Do not scrape off hardened cement. |
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Controlling the Setting Time
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Eleminating moisture.
Maintaining temperature at 70 degrees or lower. Maintaining a slow rate of spatulation. Use proper powder-to-liquid ration.. |
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Acidity
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pH of the oral cavity
▪7.0 or neutral Acidity of the materials ▪varies from 0 - 14 pH |
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Adhesion
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Holds unlike substances together.
Involves chemical or physical forces. ▪chemical = dental cements ▪physical = plaque sticking to the tooth surface ■physical adhesions more common |
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Biting Forces
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Force = push and pull on an object
Stress = reaction to resist force Strain = results causes change or deformation 130 - 170 lb in biting force PSI - pound per square inch |
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Types of Stress and Strain
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Tensile - ductility - pulling and pushing
Compressive - malleability Shearing - bruxism - teeth grinding |
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Corrosion
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Tarnish
Result of chemical or electrochemical actions |
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Dimensional Change
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Setting process
Heat and Cold |
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Elasticity
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Ability to distort or deform and then return to original shape.
Elastic modulus = how a material resists change or deformation. |
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Retention
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One surface attaches to another
Mechanical and chemical retention |
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Solubility
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Material dissolves, washes away
Material becomes more fluid |
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Thermal Properties
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Thermal Conductivity
■ transmission of heat Thermal Expansion ■ expand and contract at the same rate as the mouth |
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Flow
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Creep or slump
Deformation of a solid |
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Galvanism
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Electrical shock between two different metals
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Hardness
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Resistance to scratch or indent
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Microleakage
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Saliva leakage between tooth and restoration
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Viscosity
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Ability of a material to flow
Thick = more viscous |
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Wettability
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Ability of material to flow over a surface
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