Dental Materials Ch 13, Polymers for Prosethic Dentistry

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Lecture #9

acrylic resins

a synthetic polymer used in prosthetic dentistry ; derived from acrylic acid

polymerization shrinkage

occurs during the curing process; seen more in chemically cured acrylics versus heat cured ones

water sorption and thermal expansion

dimensional change - changes shape due to what?

low

acrylic has ___ strength and wear resistance

porosity - presence of microscopic voids

results from loss of monomer or inadequate pressure during processing

long term soft liners, short term soft liners, hard lining materials

Three types of denture liners

long term soft liners

placed in commercial lab; silicone rubber or acrylic made pliable by addition of plasticizer such as an aromataic ester or alcohol

long term soft liners

for patients who have problems with hard acrylic denture bases

1-3 years

how long do long term soft liners last?

long term soft liners

supports growth of candida albicans

short term soft liners

tissue containers placed chair-side to improve tissue health

a few days to a few weeks

how long do short term soft liners last?

short term soft liners

powder and liquid or cartridge with self mixing tip

hard lining materials

acrylic resin used to line an original denture base when denture has become loose over time due to alveolar ridge resportion

hard lining materials

chair-side (chemically-cured form) or commercial lab (heat-cured form)

chemically-cured form

chair side

heat-cured form

commercial lab

plastic teeth material

strong, does not wear opposing natural or artificial teeth and restorations

plastic teeth material

easy to adjust occlusion and polish

plastic teeth material

softer and wear more readily

porcelain teeth material

brittle, hard, wear resistant

porcelain teeth material

must be retained via pins and retention holes

porcelain teeth material

difficult to polish and adjust occlusion

porcelain teeth material

very abrasive against natural teeth and restorations

shade, shape, arrangement (idea, overlapping, diastemas, etc)

What must be taken into consideration with denture teeth?

soft lined dentures

storing in mouthwash containing alcohol is contraindicated for this material

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