Optimum Design for Fixed Partial Dentures Made of Hybrid Resin with Glass Fiber Reinforcement by Finite Element Analysis: Effect of Vertical Reinforced Thickness on Fiber Frame

By means of finite element analysis, the optimal thickness of fiber framework placed in a fiber-reinforced composite bridge replacing the mandibular first molar was obtained. Test results demonstrated that more than 30% maximum principal stress was reduced by reinforcing with fiber framework in a thickness of up to 0.6 mm for 1.5-mm occlusal clearance. Indeed, maximum principal stress generated in lower embrasure of connectors was reduced from 107 MPa to 70 MPa by maximizing reinforcement effect.