“…An important characteristic of fiber posts is their similar elastic modulus to dentine (» 20 GPa), resin cement and resin core materials, producing a stress field similar to that of natural teeth, thus yielding a protective effect against root fracture [1,3,[5][6][7][8][9][10][11][12][13][14][15][16]. Conversely, titanium, stainless steel and zirconia have elastic moduli (110 GPa, 200 GPa, 210 GPa, respectively) well above that of dentine (18 GPa) [8].…”