INBDE Practice Exam 2025 – Comprehensive All-in-One Guide to Master the Integrated National Board Dental Examination!

Self-etch adhesive systems are formulated to eliminate the need for a separate etching step by simultaneously priming and bonding to the tooth structure. However, one of the drawbacks of self-etch systems is that they can leave behind a smear layer on the dentin surface. This smear layer can inhibit the penetration of the adhesive into the dentinal tubules, leading to compromised bond strength. Therefore, the correct answer is B because the presence of a smear layer can reduce the effectiveness of self-etch adhesives.

Option A is incorrect because the acidity of self-etch systems is carefully balanced to achieve optimal bonding without causing excessive demineralization of the tooth structure. Option C is incorrect as self-etch adhesives are designed to be moderately acidic to promote bonding. Option D is incorrect as the presence or absence of HEMA (2-hydroxyethyl methacrylate) does not solely determine the effectiveness of self-etch adhesives.