CAD/CAM System Vs. Laser Milling Zirconia For Fixed Restoration Construction; Narrative Review

The aim of This review article compares the use of a computer-aided design (CAD) system, and laser milling in fabricating dental prostheses made of zirconia ceramics (TZP).Since Land made the first all-ceramic crown with low-strength feldspar porcelain in 1903 [1] , dental all-ceramic restoration materials' mechanical and aesthetic properties have been significantly evolved. Therefore, In dental clinics, these are commonly utilized. Many ways for fabricating all-ceramic dental restorations have recently been developed [2] . All-ceramic materials, on the other hand, are fragile and difficult to work with due to their high hardness and low fracture toughness. Zirconia ceramics are utilized in dental restorations because of their strong mechanical qualities, which allow them to be employed as entire ceramic restorations for long-span bridges. Milling fully sintered Zirconia might be difficult because of its extreme hardness. Instead, a CAD/CAM system is used to grind a partially sintered zirconia block, which is then sintered in a furnace. Sintering results in a linear shrinkage of 15% to 30%. [3] . For the softer partially sintered stone, milling efficiency is improved. To avoid restorative unfitnesscaused by sintering shrinkage, scanning operation, and milling [4] ., laser machining of high-hardness Zirconia is employed. In dentistry, a variety of lasers are now operational.