Thermal expansion of prepared dental base-metal casting alloys

Abstract EN

Background : This study aimed to evaluate the linear thermal expansion of prepared Ni-Cr and Co-Cr dental basemetal casting alloys which has been prepared locally in Iraq and compare with other conventional alloys. Materials and methods : Cylindrical shape wax specimen was prepared of (15mm) length and (5mm) diameter, which invested in phosphate-bonded investment material and casted by using induction-casting machine.

The liner thermal expansion has been tested by using Iraqi-made dialometer in which the furnace was set to reach from room temperature to 950 C in a rate of 10 C per minute. Results and discussion : The prepared Ni-Cr and Co-Cr alloys were showed a higher linear thermal expansion than the conventional alloys, however, statistical analysis revealed non-significant differences regarding the Co-Cr alloys and highly significant differences regarding the Ni-Cr alloys.