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Chapter 33

dental materials

Biting Force 130-170 on the molars and 40 on the anterior
Tensile Stress pulls and stretches a material. tends to be elongated. Ductility is the ability of the material to withstand THIS stress
Compressive Stress pushes or compresses a material. Malleability is the ability of a material to withstand THIS stress
Shearing stress the back and fourth movement of a material. example is bruxism or grinding of the teeth
Corrosion result of chemical or electrochemical attacks by the oral environment on pure metal such as gold or amalgam
Tarnish like corrosion, is when metals become dull and discolored
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
Micro leakage when saliva and debris from the oral cavity seep between the tooth structure and the restorative material causing decay and sensitivity
bonding agents used to bond the dentin and enamel with restorative materials. also known as adhesives and resins they are low viscosity resins
Thermal conductivity the ability of a material to transmit heat
Thermal expansion the expanding or contraction of the dental material from heat. they have to fit in te restoration
viscosity the ability of liquid to flow. the thicker the material the less it flows. the thinner the material the faster it flow.
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
Temporary luting cement short term cementing agent
Luting bonding or cementing together
Linear material placed in a thin layer on the walls and floor of the cavity preparation. protects the pulp for bacteria and irritents
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
direct pulp capping a treatment to save the pulp if the pulp is exposed
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
types of liners (low strength bases) calcium hydroxide, zoe, glass ionomer
Line angle lines are formed when two surfaces meet. named according to the meeting surfaces
Point angle in the corners of the cavity prep, three lines (surfaces) come together. named according to the meeting surfaces
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
Types of bases (high strength bases) glass & hybrid ionomers, reinforced zoe, zinc phosphate and polycarboxylate
Debridement the spraying or rinsing of the cavity prep to remove debris
Ideal Level doesn't invole pulp, goes through the enamel and just into the dentin. large enough to retain a restoration
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
Restorative/Operative dentistry when a tooth needs to be restored using various materials and techniques
reasons for rstorations loss of tooth structure, preventing reoccurring decay, restoring contour of tooth restoring function and appeaence
Cavity Varnish used to seal the dentin tubules that are exposed during a amalgam cavity prep. placed on the surface of the dentin only
Calcium Hydroxide low strength base or liner under the restoration. therapeutic effect on the pulp and has antibacterial properties
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
Zinc Phosphate permanent cementation of crowns, inlays, onlays, bridges, bands & brackets, and is also an insulating base
Created by: red112409