One of the most important requirements is any operative procedure is the selection of the most suitable type of restorative material for the individual case presented. To determine this material, the patient must be viewed as a complex human organism whose teeth are as integral part which enables him to function as a healthy being. Therefore, any consideration of restorative measures must not be limited in scope to the tooth alone but take into ac count the correlation of this structure with rest of the organism. The problem of selection of a material for a specific restoration is not an easy one and depends upon several factors.