Research of tooth crown constraint design based on DFFD

Objective To explore a digital designing method of for patients whose tooth crown has been damaged, which helps dentists to rapidly and flexibly finish the repair design of tooth crown and to obtain a three-dimensional digital manufacturing mode. Methods This paper introduces the constraint design method of tooth crown based on DFFD(direct manipulation of free-form deformation), which helps dentist use to add, modify, or delete the constraint or load points and then manipulate those feature points to product the good shape of design for the operation of stretching and compressing. Result A design example of the left-front-1 tooth crown proves this method to be feasible. Conclusion The constraint design method of tooth crown based on DFFD is feasible, which is an approach to further researches on the design of the tooth crown bridge.