Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged Laser treated Cubic Versus Tetragonal Zirconia Ceramics

Authors

Shahenda Abdallah, Assistant Lecturer of Dental Biomaterials, Faculty of Dental Medicine for Girls, Al-Azhar University, Egypt.Follow
Inas Motawea, Professor of Dental Biomaterial, and Vice Dean of Post Graduated studies and Researches, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt.Follow
Mostafa Abdel Ghany, Professor of Removable Prosthodontics, and Dean of Faculty of Dental Medicine for Girls Al-Azhar University, Cairo, Egypt.
Rania Amin, Assistant Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt.Follow

Corresponding Author

Abdallah, Shahenda

Document Type

Original Study

Abstract

Purpose: This study was carried out to compare the effect of laser surface treatment on cubic and tetragonal zirconia ceramics regarding; phase transformation tetragonal-monoclinic (T-M), surface topography, mechanical properties and biaxial flexural strength before and after low thermal degradation (LTD) aging. Materials and Methods: sixty discs (N=60) of CAD/CAM zirconia were used in this study. These specimens were divided into two main groups according to type of zirconia. Group I: (n=30) Cubic Zirconia (DD cubeX2), while Group II: (n=30) Tetragonal zirconia (Superfect-Zir). Then each group further subdivided into two subgroups according to surface treatment, subgroup (1): control without surface treatment, subgroup (2): laser surface treatment .Specimens form each subgroups were tested for the following; Phase transformation, surface topography, and mechanical properties before and after Low Thermal Degradation (LTD) aging test. Results: Statistical analysis revealed that there was a statistical significant difference between the two tested groups regarding the surface topography, biaxial flexural strength, and surface hardness. Also there was a statistical significant difference regarding the surface treatment and before/after LTD and laser among the tested zirconia ceramics. Conclusions: laser surface treatment improved the properties of tetragonal / cubic zirconia, and increases their resistance to low thermal degradation LTD aging.

Keywords

Cubic Zirconia; Thermal Degradation; Laser Surface Topography; Biaxial Flexural Strength

How to Cite This Article

Abdallah, Shahenda; Motawea, Inas; Abdel Ghany, Mostafa; and Amin, Rania (2020) "Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged Laser treated Cubic Versus Tetragonal Zirconia Ceramics," Al-Azhar Journal of Dentistry: Vol. 7: Iss. 2, Article 18.
DOI: https://doi.org/10.21608/adjg.2020.14226.1189

Subject Area

Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)