1. A system for generating a virtual model of teeth, comprising: a processor operably coupled to a computer readable storage medium comprising instructions which, when executed, cause the processor to: receive a virtual model of a patient's dentition including a virtual upper jaw member and a virtual lower jaw member respectively corresponding to at least a part of each upper and lower jaw of the patient's dentition; receive data representative of at least the spatial relationship between the upper and lower jaws in occlusion; and incorporate in the virtual model a virtual alignment arrangement configured to provide virtual occlusion alignment between the virtual upper and lower jaw members according to the spatial relationship, the virtual alignment arrangement comprising a first virtual alignment structure of the virtual upper jaw member that couples together with a second virtual alignment structure of the virtual lower jaw member, thereby defining an updated virtual model.