Which type of dental restoration is least conservative in terms of tooth structure preservation?

Complete cast crowns are considered the least conservative type of dental restoration because they typically require the removal of a significant amount of tooth structure. This is necessary to accommodate the bulk and material of the crown, ensuring it fits properly over the prepared tooth. Unlike partial coverage crowns or bonded porcelain veneers, which only cover specific areas of the tooth and preserve more of the original tooth structure, complete cast crowns encase the entire tooth.

While composite fillings also preserve tooth structure, they are generally used for smaller cavities and damage. The complete cast crown approach is essential when a tooth is extensively damaged or weakened, requiring full coverage for adequate support and function. This need for substantial reduction of natural tooth structure is why complete cast crowns rank lower in terms of conservativeness.