Indian Journal of Humanities and Social Sciences

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Effect of Laser Glazing on the Properties of Dental Ceramics.


Affiliations
1 Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura., Egypt
2 Faculty of Science, Mansoura University, Mansoura., Saudi Arabia
3 Faculty of Engineering, Mansoura University, Mansoura., Egypt
4 Faculty of Dentistry, Mansoura University, Mansoura., Egypt
     

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Objectives: The aim of this study was to investigate the hardness, morphology and structure of dental porcelain and In-Ceram Alumina after conventional glazing, XeClexcimer and CO2 laser glazing techniques at two energy densities. Materials and Methods: The materials used were conventional feldspathic porcelain Vitadur N and Vita In-Ceram Alumina. The hardness was measured using vickersmicrohardness tester. SEM and X-ray diffraction analysis of the surface structure were conducted to detect the surface changes. Results: The hardness of the porcelain specimens was not significantly increased with 2 watt CO2 laser and 1.5 Joule/cm2excimer laser glazing. Also, the hardness of in-ceram alumina was not significantly increased with 2 and 10 watt CO2 laser glazing. On the contrary, the hardness of porcelain was significantly increased with 10 watt CO2 and 6.2 Joule/cm2excimer lasers, as well as the in-ceram alumina was significantly increased with excimer laser glazing. Scanning electron microscopy declared an increase in homogeneity and smoothness of laser glazed specimens especially those glazed with higher power setting of CO2 laser and higher energy density of excimer laser when compared to the conventionally glazed specimens. X-ray diffraction charts of the control and laser glazed specimens were nearly identical, indicating that laser glazing had no effect on their internal microstructure. Conclusion: It was concluded that, laser glazing improves the surface hardness and smoothness of ceramic surfaces without affecting their internal structures. Clinical relevance: Laser technology can be used for glazing of ceramic restorations to improve its properties.

Keywords

Dental Porcelain, In-ceram Alumina, Hardness, Structure And Morphology
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  • Effect of Laser Glazing on the Properties of Dental Ceramics.

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Authors

Ibrahim M. Hammouda
Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura., Egypt
Mostafa Kamal Mohammed
Faculty of Science, Mansoura University, Mansoura., Saudi Arabia
Ossama B. Abouelatta
Faculty of Engineering, Mansoura University, Mansoura., Egypt
Abeer A. El Fallal
Faculty of Dentistry, Mansoura University, Mansoura., Egypt

Abstract


Objectives: The aim of this study was to investigate the hardness, morphology and structure of dental porcelain and In-Ceram Alumina after conventional glazing, XeClexcimer and CO2 laser glazing techniques at two energy densities. Materials and Methods: The materials used were conventional feldspathic porcelain Vitadur N and Vita In-Ceram Alumina. The hardness was measured using vickersmicrohardness tester. SEM and X-ray diffraction analysis of the surface structure were conducted to detect the surface changes. Results: The hardness of the porcelain specimens was not significantly increased with 2 watt CO2 laser and 1.5 Joule/cm2excimer laser glazing. Also, the hardness of in-ceram alumina was not significantly increased with 2 and 10 watt CO2 laser glazing. On the contrary, the hardness of porcelain was significantly increased with 10 watt CO2 and 6.2 Joule/cm2excimer lasers, as well as the in-ceram alumina was significantly increased with excimer laser glazing. Scanning electron microscopy declared an increase in homogeneity and smoothness of laser glazed specimens especially those glazed with higher power setting of CO2 laser and higher energy density of excimer laser when compared to the conventionally glazed specimens. X-ray diffraction charts of the control and laser glazed specimens were nearly identical, indicating that laser glazing had no effect on their internal microstructure. Conclusion: It was concluded that, laser glazing improves the surface hardness and smoothness of ceramic surfaces without affecting their internal structures. Clinical relevance: Laser technology can be used for glazing of ceramic restorations to improve its properties.

Keywords


Dental Porcelain, In-ceram Alumina, Hardness, Structure And Morphology

References