What is the purity requirement for mercury in dental amalgams according to ANSI/ADA Specification No. 6?

1) It must be at least 99.9% pure.
2) It must be at least 99.0% pure.
3) It must be at least 95.0% pure.
4) It must be at least 90.0% pure.

What is the primary reason for using zinc polycarboxylate cement as a luting agent?
1) Its high compressive strength
2) Its ability to bond chemically to tooth structure
3) Its ease of manipulation
4) Its insolubility in oral fluids

What is the purpose of the calcium content in an electralloy?

1) To improve its malleability
2) To enhance its resistance to corrosion
3) To facilitate bonding with dental tissues
4) To increase its hardness and wear resistance

What is the function of the reticular formation in the regulation of sleep and wakefulness?
1) It initiates sleep
2) It maintains wakefulness
3) It is not involved in sleep-wake regulation
4) It initiates REM sleep