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

The most resistant filling material for class IV cavities is resins with glass or quartz. This choice is correct due to the inherent properties of these materials that contribute to their durability and resistance to wear. Resins that incorporate glass or quartz provide superior mechanical strength, making them highly suitable for areas of the tooth that undergo significant stresses, such as the anterior teeth, where class IV cavities are common due to caries or trauma.

Glass particles in particular not only enhance the strength but also improve the aesthetic qualities of the filling. They help in achieving a finish that closely matches the natural tooth structure. Additionally, quartz fills increase the resistance of the material to abrasion and wear, which is critical in ensuring the longevity of the restoration in a high-stress area of the mouth.

In contrast, other materials listed may not offer the same level of resistance. For instance, resins with silicone dioxide may have different mechanical properties and not provide the enhanced durability of glass or quartz-infused resins. Silico-phosphate and silicates may also lack the strength and wear resistance that glass or quartz-filled resins possess, making them less suitable for the demanding conditions found in class IV cavities.