1. A method of creating an integrated three-dimensional virtual patient model comprising a patient's dentition and craniofacial anatomical structures using a surface scanner, a volume scanner and a workstation, comprising the steps of: (a) obtaining raw three-dimensional surface scanning data of one or more visual portions of said dentition of said patient using said surface scanner; (b) obtaining raw three-dimensional volume scanning data of said dentition and craniofacial anatomical structures of said patient using said volume scanner; (c) downloading and then processing said raw three-dimensional surface scanning data and said raw three-dimensional volume scanning data in said workstation; and (d) registering said surface scanning data after processing with said volume scanning data after processing in said workstation, thereby (i) creating said integrated three-dimensional virtual patient model; and (ii) automatically eliminating noise and/or distortion, if any, from said volume scanning data.