INFLUENCE OF HEAT TREATMENT AND IN-VITRO AGING ON MECHANICAL PROPERTIES AND SURFACE ROUGHNESS OF COLD ISOSTATIC PRESSED ZIRCONIA - AN INVITRO STUDY

Purpose:Mechanical and surface characteristics of the zirconia dental ceramics may be adversely impacted by temperature changes during veneering firing cycles. A potential synergistic failure could caused ageing when exposed to oral environment heat treatment. The current research aimed determine influence treatment in-vitro on mechanical properties roughness cold isostatic pressed zirconia. Materials Methods:15 bar shaped specimens with dimensions 28mm×4mm×2mm are milled from two types partially sintered Y-TZP ceramic blanks (IPS e.max ZirCAD (IZ),ZENO Zr (WZ)). Out 15 samples five used as control (C group), treated (H group) subsequently aged (HA group). Flexural strength shear bond measured using universal testing machine is proliferometer. Results:Heat ivoclar weiland led an increase in a loss (flexural strength), although differences not statistically significant (p>0.05). Yet, combined created effect characteristics. (p<0.001). More variations were seen samples. Conclusion:Firing processes have impact clinical performance, which raises risk failure.