MDS PREP
What is the typical intensity range of a dental argon laser?
1) 1-10 mW.
2) 100-500 mW.
3) 500-1000 mW.
4) More than 1000 mW.
Dental argon lasers typically operate within the range of 100 to 500 mW, providing sufficient power for soft tissue procedures and some hard tissue interactions.
What is the typical film thickness for a resin cement?
1) 50 µm
2) 25 µm
3) 15 µm
4) 5 µm
Resin cements are generally applied in a film thickness of 25 µm or less for optimal performance.
What is the recommended thickness of the luting agent film for optimal effectiveness?
1) 50 µm
2) 25 µm
3) 15 µm
4) 5 µm
According to the text, a luting agent must be sufficiently fluid to flow into a continuous film of 25 µm thickness or less without fragmentation.
What is the primary advantage of resin teeth over porcelain teeth in terms of impact resistance and ductility?
1) Resin teeth are more likely to chip or fracture.
2) Resin teeth have better dimensional stability.
3) Resin teeth have greater wear resistance.
4) Resin teeth are less likely to chip or fracture.
Resin teeth are more ductile than porcelain teeth, which means they can absorb and distribute forces better, making them less prone to chipping or fracturing on impact.
What is the effect of pH on the bond strength of zinc polycarboxylate cement?
1) High pH increases bond strength.
2) Low pH increases bond strength.
3) pH has no effect on bond strength.
4) High pH decreases bond strength.
The bond strength is influenced by the acidity; a lower pH can enhance the bond strength.
Austenite is an alloy of iron and carbon with the iron in
1) Alpha form
2) Beta form
3) Gamma form
4) None of the above
Dental Materials
Answer: 3
The first light-activated systems were formulated for UV light to initiate free radicals. Today the UV light-cured composites have been replaced by visible blue-light-activated systems with greatly improved depth of cure, a controllable working time, and other advantages.
Because of these advantages, visibly light-activated composites are more widely used than are chemically acti wited materials.
What are the two types of alginate impression materials according to ADA specification No. 18?
1) Type I - Fast set with a setting time of 1-2 minutes, Type II - Normal set with a setting time of 2-4 minutes
2) Type I - Slow set with a setting time of 3-5 minutes, Type II - Medium set with a setting time of 4-6 minutes
3) Type I - Fast set with a setting time of 1-2 minutes, Type II - Slow set with a setting time of 3-5 minutes
4) Type I - Normal set with a setting time of 1-2 minutes, Type II - Fast set with a setting time of 2-4 minutes
ADA specification No. 18 categorizes alginate impression materials into two types: Type I (Fast set) with a setting time of 1-2 minutes and Type II (Normal set) with a setting time of 2-4 minutes.
Which of the following is not a type of oil-based cement?
1) Zinc oxide-eugenol
2) Zinc phosphate
3) Nano-eugenol-zinc oxide
4) All of the above are oil-based cements
Zinc oxide-eugenol is the only oil-based cement mentioned in the text.