Dental OSCE (Objective Structured Clinical Examination) Practice Exam

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What is a common reason for sealants to fail?

Improper placement
Contamination
Material degradation
Inadequate curing

The correct answer is: Contamination

A common reason for sealants to fail is contamination. Sealants are applied to the tooth surface to prevent decay, but if the tooth is contaminated with saliva, plaque, blood, or other debris at the time of application, the sealant may not adhere properly. This inadequate bond can lead to the sealant becoming dislodged or prematurely wearing off. Properly isolating the tooth, usually through the use of cotton rolls or a rubber dam, is crucial to minimize contamination during the sealing procedure. While improper placement, material degradation, and inadequate curing may also contribute to sealant failure, contamination stands out as a primary factor that directly affects the bond strength and effectiveness of the sealant. Ensuring a clean and dry surface prior to application is essential for achieving long-lasting results with dental sealants.