“…Ceramics are defined as inorganic, crystalline, non-metallic materials which contain metallic and non-metallic bonded elements, e.g., aluminum-oxide and yttrium tetragonal zirconia polycrystal 3) . Glass ceramics consist of a glassy phase that acts as the matrix and a ceramic as the reinforcing filler, e.g., lithium disilicate glass ceramics 3,4) , leucitereinforced glass ceramics 3,4) , and feldspathic glass ceramics 3,5) . Resin composites consist of a polymeric matrix and reinforcing fillers, which could be ceramics, glass, glass ceramics, organic or composite 6) .…”