Assessment of consistency and compressive strength of manufactured dental base materials from enamel powder and synthetic hydroxyapatite with or without CO2 laser treatment

الملخص EN

Back ground : This study was done to assist consistency and, compressive strength 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 standard consistency test described in America dental association (ADA) specification No.8 was used so that all manufactured base materials could be conveniently mixed and the results would be of comparable value and the compressive strength test described by British standard specification for zinc polycarboxylate cement was used in this study, Results : the results showed that a standard 0.5 ml of liquid (polycarboxylic acid) can be mixed with 350 mg of base material that contains mixture of enamel powder ,hydroxyapatite and zinc oxide 300 mg of base material that, contains Enamel powder and zinc oxide, and 400 mg of base material that contains Synthetic Hydroxyapatite and zinc oxide the manufactured base material that contains mixture of enamel powder and hydroxyapatite without CO2 laser treatment has compressive strength of (48.36 ± 2.07) MPa, while the manufactured base material that contains mixture of enamel powder and hydroxyapatite with CO2 laser treatment has compressive strength of (2.52 ± 62.47) MPa.

However, the manufactured base material that contains enamel powder with CO2 laser treatment has compressive strength of (66.08 ± 2.33) MPa and the results also appeared that the compressive strength will increases after one week storage.

Conclusion : the manufactured base materials that contains hydroxyapatite requires higher amount of powder to be mixed with 0.5 ml polycarboxlic acid and the base material that contains mixture of enamel powder and synthetic hydroxyapatite has higher compressive strength and the CO2 laser treatment will increase the compressive strength of the manufactured base materials.