National Dental Assisting Examining Board (NDAEB) Practice Exam

Which of the following waxes is used to help contain the stone and form a base when pouring an impression?

1. Baseplate wax

2. Boxing wax

3. Utility wax

4. Sticky wax

The correct answer is: Boxing wax

Boxing wax is specifically designed for the purpose of creating a containment area when pouring impressions in dental procedures. This wax is used to build a raised border around the impression. By doing this, it ensures that the setting material, typically gypsum based stone, remains contained within the confines created by the wax, allowing for a more accurate and clean pour. Using boxing wax is also advantageous because it helps in shaping the base of the final cast. The flexibility and adhesive properties of boxing wax allow it to conform to the shape of the impression and adhere well to the surface, which is essential in preventing leakage of the material. This creates a smooth and even foundation for the cast. While baseplate wax, utility wax, and sticky wax serve different purposes in the dental context — such as for the formation of custom trays or holding materials together — they are not specifically designed for the containment of impression materials during the pouring process.