Oklahoma Pit and Fissure Sealants State Practice Exam

For how many seconds should the etchant be placed on the tooth when using 34-37% phosphoric acid?

1. 5-10

2. 15-60

3. 30-45

4. 60-90

The correct answer is: 15-60

Using 34-37% phosphoric acid as an etchant on a tooth requires a specific application time to ensure proper enamel etching, which is essential for the effective bonding of sealants. The correct duration is typically between 15 to 60 seconds. This range allows the acid to adequately penetrate the enamel surface and create a micro-roughened surface, which enhances the mechanical retention of the sealant. Shorter application times may not provide enough etching, while longer times might lead to over-etching, which could damage the enamel. Therefore, adhering to the recommended 15 to 60 seconds helps practitioners achieve the optimal surface characteristics for sealant placement, maximizing the potential for successful adhesion and longevity of the sealant.