Electronic models of components of dental appliances can be generated based on the outer surface of an electronic model of the dental appliance. The outer surface may be generated based on the dentition and anatomy of the patient. For example, automated processes may identify landmarks in the anatomy and define the outer surface based on the identified landmarks. Alternatively, the outer surface may be generated based on statistical data. A management system coordinates automated processes with interactive processes to facilitate collaboration of remotely located technicians and equipment in generating electronic models.