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

A, Hussein; J.Al- Aazawi, Haitham; R. Al-Jabouri, Mohammed

	Assessment of consistency and compressive strength of manufactured dental base materials from enamel powder and synthetic hydroxyapatite with or without CO2 laser treatment
Journal of baghdad college of dentistry
Article 1, Volume 21, Issue 1, 2009, Pages 28-32
Authors
Hussein A; Haitham J.Al- Aazawi; Mohammed R. Al-Jabouri
Abstract
ABSTRACTBack ground: This study was done to assist consistency and, compressive strength of manufactured dental basematerials 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 CO2laser (15.92W/cm2 power density and 0.2 seconds exposure time) were detected from the pilot study. The standardconsistency test described in America dental association(ADA) specification No.8 was used so that all manufacturedbase materials could be conveniently mixed and the results would be of comparable value and the compressivestrength 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 basematerial that contains mixture of enamel powder ,hydroxyapatite and zinc oxide ,300 mg of base material thatcontains Enamel powder and zinc oxide, and 400mg of base material that contains Synthetic Hydroxyapatite andzinc oxide the manufactured base material that contains mixture of enamel powder and hydroxyapatite withoutCO2 laser treatment has compressive strength of (48.36±2.07) MPa ,while the manufactured base material thatcontains mixture of enamel powder and hydroxyapatite with CO2 laser treatment has compressive strength of(62.47±2.52)MPa. However, the manufactured base material that contains enamel powder with CO2 laser treatmenthas compressive strength of (66.08±2.33)MPa and the results also appeared that the compressive strength willincreases after one week storage.Conclusion: The manufactured base materials that contains hydroxyapatite requires higher amount of powder to bemixed with 0.5 ml polycarboxlic acid and the base material that contains mixture of enamel powder and synthetichydroxyapatite has higher compressive strength and the CO2 laser treatment will increase the compressive strengthof the manufactured base materials.Key words: consistency, Compressive, manufactured base materials. J Bagh Coll Dentistry 2009; 21(1): 28-32)

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