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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 | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 21, Issue 4, 2009, Pages 13-18 | ||
| Authors | ||
| Hussein A; Haitham J.Al- Azzawi; Mohammed R. Al-Jabouri; | ||
| Abstract | ||
| ABSTRACTBackground: This study was done to assess diametral tensile strength and microhardness of manufactured dentalbase 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 CO2laser (15.92W/cm2 power density and 0.2 seconds exposure time) were detected from the pilot study. The diametraltensile strength test described by British standard specification for zinc polycarboxylate cement was used in this studyand microhardness test was performed on acrylic blocks with holes containing the manufactured base materials byVicker`s microhardness testing machine.Results: The results showed that the manufactured base material that contains mixture of enamel powder andhydroxyapatite without CO2 laser treatment has diametral tensile strength of (12.2±0.7)MPa and ( 42.95±2.8) Kg/mm2microhardness, the manufactured base material that contains mixture of enamel powder and hydroxyapatite withCO2 laser treatment has diametral tensile strength of (15.9±0.8)MPa and (58±1.7) Kg/mm2 microhardness. Thediametral 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 higherdiametral tensile strength and microhardness value than other base materials and CO2 laser treatment will increasediametral tensile strength and microhardness value.Key words: Diametral, microhardness, enamel, hydroxyapatite. (J Bagh Coll Dentistry 2009; 21(4): 13-18) | ||
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