Assessment of setting time and solubility of manufactured dental base materials from enamel powder and synthetic hydroxyapatite with or without CO2 laser treatment

Abstract

ABSTRACT
Back ground: This study was done to assist setting time, solubility of manufactured dental base materials from enamel
powder and synthetic hydroxyapatite with or without CO2 lasers 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 setting time
and solubility tests described by British standard specification for zinc polycarboxylate cement was used in this study
Results: The results showed that the manufactured base material that contains mixture of enamel powder and
hydroxyapatite without CO2 laser treatment has (29.47±2) minutes setting time, and (1.136 ±0.5)% solubility, while the
manufactured base material that contains mixture of enamel powder and hydroxyapatite with CO2 laser treatment
has (26.1±3.8) minutes setting time, and(2.66± 0.5)% solubility. While the manufactured base material that contains
hydroxyapatite powder with CO2 laser treatment has (16.7±4.5) minutes setting time, and (1.78±0.5) % solubility.
Conclusion: The manufactured base materials that contains enamel powder has longer setting time and the CO2
laser treatment will reduce the setting time of all types of the manufactured base materials, the base materials that
contains synthetic hydroxyapatite has higher solubility than other base materials and the CO2 laser treatment will
reduce the solubility of the manufactured base materials.
Key words: Setting time, solubility, laser. (J Bagh Coll Dentistry 2009; 21(4): 19-23).