1. A method of producing a dental splint comprising the steps of: obtaining a set of 3D surface data ( 110 ), the 3D surface data representing a surface of a patient's oral situation, obtaining a support structure model ( 310 ) describing a component configured to fit to a portion of the surface of the patient's oral situation, modifying an apical edge ( 330 ) of the support structure model in dependence on the 3D surface data, producing the dental splint in dependence on the modified support structure model.