National Dental Assisting Examining Board (NDAEB) Practice Exam

The calcium hydroxide cavity liner is mixed with a(n):

1. Syringe

2. Ball-shaped applicator

3. Brush

4. Swab

The correct answer is: Ball-shaped applicator

Calcium hydroxide cavity liner is a commonly used material in restorative dentistry due to its properties such as promoting dentin regeneration and providing a barrier against bacteria. When applying this liner, it is typically mixed to achieve a proper consistency. The mixing process requires a specific instrument to ensure that the material is applied uniformly and effectively. A ball-shaped applicator is designed to provide an even spread of materials like calcium hydroxide, allowing for precise placement in the cavity preparation. Its shape helps to manipulate the material into the specific areas of the cavity and ensures that it adheres well to the tooth structure. This applicator can reach into the contours of the cavity, making it suitable for the detailed application required with calcium hydroxide. In contrast, tools like a syringe or a brush may not provide the same level of control and accuracy when trying to apply a cavity liner. A syringe is often used for more fluid materials, while a brush might lead to inconsistent application because it can pick up too much or too little of the liner. A swab could also lack the firmness and precision needed for an effective application of a cavity liner. Therefore, the ball-shaped applicator is the most appropriate tool for mixing and applying calcium hydroxide cavity liner due to its specific shape and