California Registered Dental Assistant (RDA) Written Practice Exam

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What is the range of shelf life of sealants materials?

6 to 12 months
12 to 24 months
18 to 36 months
36 to 48 months

The correct answer is: 18 to 36 months

Option A is incorrect because 6 to 12 months is a very narrow range for shelf life and many sealants can last longer than 12 months. Option B is incorrect because 12 to 24 months is still a relatively narrow range for shelf life, and many sealants can last longer than 24 months. Option D is incorrect because 36 to 48 months is a very long range for shelf life and many sealants will expire or lose effectiveness before 48 months. Therefore, option C, 18 to 36 months, is the correct answer as it provides a reasonable and common range for the shelf life of sealant materials. It allows for variations in different types of sealants and takes into consideration that shelf life can also be affected by storage conditions.