Designing the Gear Train of a Dental Rotary Cutting Tool

The system is composed of a powered handpiece that transfers mechanical energy from an electric motor to a rotary burr. The design includes the motor input system, a burr shaft, power transmission system, support bearings, and a cutting burr that interacts with the biological materials (dentin, enamel, etc.). To meet functional and safety requirements, the system was evaluated using principles of mechanical design such as AGMA gear analysis, shear fatigue design//diagrams, bending and contact stress evaluation/diagrams, free-body analysis, and deflection analysis. This project uses CAD modeling, material selection, process refinement, and analytical stress calculations to develop a manufacturable rotary tool design with an emphasis on reliability and performance in its biological environment.