From teeth made of ivory and implanted in the jaw during historical times to modern day, high-strength ceramic restorations,our  goal has always been to restore function and enhance esthetic realism .Because of the ability of the ceramics to mimic natural tooth structure combined with the strength and marginal fit of the bonded, metal–alloy substructure, this restoration became the gold standard for restoring anterior teeth.In the past decade there has been an increased consciousness concerning dental health and esthetics which has given impetus in the field of material science to develop more durable and life-like appearing restorative materials.

There are numerous all-ceramic systems available on the market, and two of the most popular systems are zirconia-based or lithium disilicate-based. The question becomes, which system should be chosen and when? Strength and longevity become important parameters when making the choice however esthetics is also in high demand . 

There is also the question of the type of restoration—single crown vs fixed partial denture (FPD), anterior Vs posterior zone , vital vs nonvital tooth ...thus making the pendulum swing between esthetic but weaker VS stronger but opaque ....

As we do not have the “perfect” material that can be applied universally to all clinical situations, it has led to a CERAMIC WAR , nevertheless sound knowledge and clinical judgment must guide the clinician in the choice of material, and it is the sole responsibility of the dentist, not the dental laboratory technician, to make the diligent decision .