The best book to prepare for dental materials is Philip’s Anusavice science of dental materials. For dental cements and dental waxes read Craig’s restorative dental materials also.
1. Softening heat treatment of casting leads to increase in ductility but decreases tensile strength, proportional limit and hardness.
2. The main component of casting wax is – paraffin wax (carnauba wax is added to reduce flow at mouth temperature)
3. When casting shrinkage can be compensated by thermal expansion of the investment – type I investment is used
4. Principal corrosion product in dental gold alloys is silver (Ag2S)
Surface tarnish is due to sulphur and chloride
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