Australian Dental Council (ADC) Test 2026 – 400 Free Practice Questions to Pass the Exam

The statement emphasizing that the larger the breakdown, the greater the chance of decay is true because defective margins in amalgam restorations create spaces where plaque and bacteria can accumulate, leading to potential caries. When the margins are compromised—either by wear, improper placement, or mechanical failure—this separation can trap food particles and bacteria, significantly increasing the risk of tooth decay in the affected area. Additionally, these margins can allow for moisture ingress, which also promotes the development of decay beneath the restoration. Therefore, recognizing and addressing defects in amalgam margins is crucial for maintaining the overall health of the tooth and preventing future dental issues.

The other options do not accurately reflect the clinical implications of defective margins. For instance, the perception that defective margins have no impact on tooth health overlooks the biological consequences of decay development. Similarly, addressing defective margins requires more than simply polishing; appropriate restorative interventions may be necessary to restore proper function and aesthetics. Lastly, dismissing small defects can lead to exacerbated problems over time, demonstrating the importance of early intervention to maintain dental health.