Computer-implemented methods of designing dental restorations and systems for performing the described methods are provided. In an embodiment, a method includes providing a virtual three dimensional representation of at least a portion of the patient's dentition that includes at least one preparation tooth, identifying a preparation margin on the virtual three dimensional representation, placing an arch form of a virtual tooth library in alignment with the virtual three dimensional representation, and proposing an initial restoration design based upon a tooth design obtained from the virtual tooth library.
