Assessment of diametral tensile strength and microhardness of manufactured dental base materials from enamel powder and synthetic hydroxyapatite with or with out CO2 laser treatment

الملخص EN

Background : This study was done to assess diametral tensile strength and micro hardness of manufactured dental base materials from enamel powder and synthetic hydroxyapatite with or without CO2 laser treatment.

Materials and methods: The ratio of the elements of the manufactured base materials and the parameters of CO2 laser (15.92W/cm2 power density and 0.2 seconds exposure time) were detected from the pilot study.

The diametral tensile strength test described by British standard specification for zinc polycarboxylate cement was used in this study and micro hardness test was performed on acrylic blocks with holes containing the manufactured base materials by Vicker`s micro hardness testing machine.

Results : the results showed that the manufactured base material that contains mixture of enamel powder and hydroxyapatite without CO2 laser treatment has diametral tensile strength of (12.2 ± 0.7) MPa and ( 42.95 ± 2.8) Kg / mm2 micro hardness, the manufactured base material that contains mixture of enamel powder and hydroxyapatite with CO2 laser treatment has diametral tensile strength of (15.9±0.8)MPa and (58±1.7) Kg/mm2 micro hardness.

The diametral tensile strength showed that it will increase after one week storage.

Conclusion : The base materials that contains mixture of the enamel powder and synthetic hydroxyapatite has higher diametral tensile strength and micro hardness value than other base materials and CO2 laser treatment will increase diametral tensile strength and micro hardness value.