dental materials
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| Biting Force | 130-170 on the molars and 40 on the anterior
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| Tensile Stress | pulls and stretches a material. tends to be elongated. Ductility is the ability of the material to withstand THIS stress
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| Compressive Stress | pushes or compresses a material. Malleability is the ability of a material to withstand THIS stress
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| Shearing stress | the back and fourth movement of a material. example is bruxism or grinding of the teeth
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| Corrosion | result of chemical or electrochemical attacks by the oral environment on pure metal such as gold or amalgam
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| Tarnish | like corrosion, is when metals become dull and discolored
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| Galvanism | when two different metals are present in the mouth. the is a chance of creating small electrical shocks like biting on aluminum foil with a restoration
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| Micro leakage | when saliva and debris from the oral cavity seep between the tooth structure and the restorative material causing decay and sensitivity
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| bonding agents | used to bond the dentin and enamel with restorative materials. also known as adhesives and resins they are low viscosity resins
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| Thermal conductivity | the ability of a material to transmit heat
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| Thermal expansion | the expanding or contraction of the dental material from heat. they have to fit in te restoration
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| viscosity | the ability of liquid to flow. the thicker the material the less it flows. the thinner the material the faster it flow.
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| wettability | the ability of a material to flow over the surface of a tooth. low contact angle is good. high contact angle is poor wetting of the solid
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| Temporary luting cement | short term cementing agent
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| Luting | bonding or cementing together
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| Linear | material placed in a thin layer on the walls and floor of the cavity preparation. protects the pulp for bacteria and irritents
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| palliative effect | also known as sedative is the soothing effect that a material may have on a tooth, can relieve pain but doesn't cure problem
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| direct pulp capping | a treatment to save the pulp if the pulp is exposed
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| cavity liners | placed in the deepest portion of the cavity prep on the axil and pupal walls. forms a cement liner w/ minimal strength, placed on dentin or exposed pulp
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| types of liners (low strength bases) | calcium hydroxide, zoe, glass ionomer
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| Line angle | lines are formed when two surfaces meet. named according to the meeting surfaces
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| Point angle | in the corners of the cavity prep, three lines (surfaces) come together. named according to the meeting surfaces
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| Cement bases | mixed into a thick putty, placed in the cavity prep to protect the pulp & mechanical support for the restoration. used to raise the floor level to ideal height
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| Types of bases (high strength bases) | glass & hybrid ionomers, reinforced zoe, zinc phosphate and polycarboxylate
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| Debridement | the spraying or rinsing of the cavity prep to remove debris
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| Ideal Level | doesn't invole pulp, goes through the enamel and just into the dentin. large enough to retain a restoration
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| Near Exposure | a large amount of enamel and dentin being removed but the pulp is not exposed. the floor might be slightly pink due to proximity of the pulp
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| Restorative/Operative dentistry | when a tooth needs to be restored using various materials and techniques
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| reasons for rstorations | loss of tooth structure, preventing reoccurring decay, restoring contour of tooth restoring function and appeaence
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| Cavity Varnish | used to seal the dentin tubules that are exposed during a amalgam cavity prep. placed on the surface of the dentin only
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| Calcium Hydroxide | low strength base or liner under the restoration. therapeutic effect on the pulp and has antibacterial properties
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| Zinc Oxide Eugenol (ZOE) | type 1 is not as strong used for temporary restorations. Type 2 called IRM and is placed in the mouth and lasts up to a year
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| Zinc Phosphate | permanent cementation of crowns, inlays, onlays, bridges, bands & brackets, and is also an insulating base
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