What feature is essential for facilitating plaque removal in an interim fixed restoration?

Proper contour is crucial for facilitating plaque removal in an interim fixed restoration because it allows for a smoother surface that can be easily cleaned during routine oral hygiene practices. When a restoration has the right contour, it mimics the natural tooth shape, providing the necessary contours and interproximal spaces that encourage effective brushing and flossing. This reduces the risk of plaque accumulation and helps maintain periodontal health.

In contrast, features such as poor contour or rough surfaces can lead to increased areas where plaque can adhere, making it difficult for patients to maintain proper oral hygiene. Similarly, minimal thickness may not necessarily contribute to plaque removal; rather, it can affect the strength and durability of the restoration. Therefore, having a proper contour is key to ensuring that an interim fixed restoration functions effectively and supports the overall oral hygiene of the patient.