Australian Dental Council (ADC) Test 2025 – 400 Free Practice Questions to Pass the Exam

Composite restorations are particularly durable in Class IV cavities due to the nature of these restorations and the location of the cavities. Class IV cavities are those that involve the incisal edges of anterior teeth and may include proximal surfaces.

The materials used in composite restorations have excellent properties that lend themselves well to this specific type of cavity. In Class IV situations, restorations are subjected to less occlusal stress compared to posterior regions, allowing the composite material to maintain its integrity over time. Additionally, the adhesive properties of composite materials promote a strong bond to the tooth structure, enhancing their durability, especially in areas that require an aesthetic finish and contour.

In contrast, Class I cavities involve occlusal surfaces of posterior teeth, which are subject to significant chewing forces, potentially leading to wear and failure. Class II cavities affect interproximal surfaces of posterior teeth, where similar forces are at play, increasing the likelihood of fractures or debonding. Class III cavities, affecting proximal surfaces of anterior teeth without involving the incisal edge, also face challenges, albeit to a lesser extent than Classes I and II.

Overall, the bonding capacity, lower stress levels, and the well-conceived placement of composite restorations contribute to their superior durability when used in