Method and apparatus including obtaining digital representations of two or more dental appliances, determining a common base coordinate parameter for the two or more dental appliances, orientating the respective digital representations of the two or more dental appliances in accordance with the common base coordinate parameter, aligning the digital representations of the two or more dental appliances based on one or more characteristics associated with each of the two or more dental appliances, and storing the digital representations of the two or more dental appliances oriented to based on the common base coordinate parameter are disclosed.