Modern conservative dental treatment prefers minimal invasive options rather than the relatively destructive treatments used in the time of amalgam and gold alloys. Use of all-ceramic restorations still have large preparations of tooth as well. Minimal invasive treatments became possible in restorative and prosthetic dentistry through the development of enamel and dentine bonding techniques, and through the improvement of restorative materials, especially resin composites. However, inadequate mechanical properties, especially flexural strength, fatigue strength, and toughness of resin composites made of particulate fillers, have limited their use in heavy load bearing areas in single restorations, and especially in fixed prostheses.