Prosthodontic management of the curve of Spee: Use of the Broadrick flag

Proper management of the occlusal plane is an essential consideration when multiple long-span posterior restorations are designed. When restorations are added to an existing tooth arrangement characterized by rotated, tipped, or extruded teeth, excursive interferences may be incorporated, resulting in detrimental sequelae. The curve of Spee, which exists in the ideal natural dentition, allows harmony to exist between the anterior tooth and condylar guidance. An instrument called the Broadrick flag has been used to assist in the reproduction of tooth morphology that is commensurate with the curve of Spee when posterior restorations are designed; its use prevents the introduction of protrusive interferences. Consideration also must be given to lateral excursive movements when the occlusal plane is designed. In this article, the importance of the curve of Spee in prosthdontic and restorative dentistry is discussed, and a patient treatment demonstrating use of the Broadrick flag is described.