HESI General Chairside Assisting Practice Exam

During the application of dental sealants, which step is crucial to prevent sealant failure?

1. Ensure complete drying of the tooth

2. Avoid etched saliva contamination

3. Apply a bonding agent first

4. Use a high-speed handpiece

The correct answer is: Avoid etched saliva contamination

Preventing saliva contamination during the application of dental sealants is crucial to ensuring their success. When the enamel surface is etched and prepared for sealant application, it becomes susceptible to moisture contamination, particularly from saliva. If saliva contacts the etched surface, the sealant may not adhere properly, leading to failure of the sealant over time. The bond created between the sealant and the tooth is critical for long-term retention; therefore, maintaining a dry field during the procedure helps to achieve an optimal seal and reduces the likelihood of bacteria infiltrating beneath the sealant, which can cause decay. The complete drying of the tooth is important, but it primarily relates to visibility and initial preparation rather than direct failure due to contamination. The application of a bonding agent is typically not necessary for the sealants themselves, as sealants are designed to adhere directly to the etched enamel. The use of a high-speed handpiece is relevant for tooth preparation in some scenarios but is not specifically related to the immediate security of the sealant's placement. Overall, avoiding contamination ensures that the sealant maintains its protective function effectively.