Which restoration is primarily designed to provide maximum strength and aesthetics for severely worn down teeth?

The restoration that is primarily designed to provide maximum strength and aesthetics for severely worn down teeth is the complete crown. A complete crown surrounds the entire tooth structure, offering extensive coverage and support. This is particularly beneficial for teeth that have been significantly worn down or damaged, as it helps to restore their shape, size, and alignment while also providing strength to withstand normal functional forces.

Complete crowns can be made using various materials, allowing for a balance between aesthetic considerations and the necessary durability. They are crucial in cases where other types of restorations might not offer sufficient support or coverage, particularly for teeth that are structurally compromised.

In contrast, veneers are typically used for aesthetic improvement and are not designed to provide full coverage or strength like a crown would. Overlays, while they can provide some support, are generally less extensive than crowns and may not be suitable for severely worn teeth. Post and core systems are utilized primarily in endodontically treated teeth to build up the tooth structure for further restoration and do not serve as a standalone solution for the restoration of severely worn teeth. Thus, a complete crown is the most appropriate choice for maximum strength and aesthetics in these cases.