Which restoration type requires more tandem restorations for optimal function in patients with high caries index?

The restoration type that requires more tandem restorations for optimal function in patients with a high caries index is onlays. Onlays are designed to cover one or more cusps of a tooth and are typically used when there is significant tooth structure loss, yet enough remaining tooth structure allows for the retention of the restoration.

In patients with a high caries index, these individuals are more prone to developing new caries, especially in areas adjacent to existing restorations. Onlays may require additional restorations to ensure comprehensive coverage of all susceptible areas to prevent further decay. This could involve combining onlays with crowns or complementary restorations, ensuring that the overall integrity and function of the dentition are maintained.

Complete ceramic crowns and inlays can also be considered for patients with a high caries index, but they do not inherently necessitate as many additional restorations as onlays may. Veneers, typically used for esthetic reasons and not restorative purposes, are less relevant in the context of managing a high caries index due to their limited coverage and utility in addressing decay-related issues.