Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study)
Abo-Elezz, A., Eletreby, A., Mohamed, F. (2023). Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study). EKB Journal Management System, 69(2), 1297-1306. doi: 10.21608/edj.2023.184618.2394
Ahmed Abo-Elezz; Amr Eletreby; Fatma Mohamed. "Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study)". EKB Journal Management System, 69, 2, 2023, 1297-1306. doi: 10.21608/edj.2023.184618.2394
Abo-Elezz, A., Eletreby, A., Mohamed, F. (2023). 'Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study)', EKB Journal Management System, 69(2), pp. 1297-1306. doi: 10.21608/edj.2023.184618.2394
Abo-Elezz, A., Eletreby, A., Mohamed, F. Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study). EKB Journal Management System, 2023; 69(2): 1297-1306. doi: 10.21608/edj.2023.184618.2394

Effect of Heat Tempering on the Biaxial Flexural Strength of four Heat Pressed glass ceramics (an in vitro study)

Egyptian Dental Journal
Article 12, Volume 69, Issue 2 - Serial Number 4, April 2023, Page 1297-1306  XML PDF (2.78 MB)
Document Type: Original Article
DOI: 10.21608/edj.2023.184618.2394
View on SCiNiTO View on SCiNiTO
Authors
Ahmed Abo-Elezz email orcid 1; Amr Eletrebyorcid 2; Fatma Mohamedorcid 3
1B.D.S Faculty of Dentistry, October University , For Modern Science and Arts
2Professor of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University
3Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University
Abstract
Objectives: the aim of this study was to evaluate the effect of thermal tempering on the biaxial flexural strength of four types of heat pressed
Lithium disilicates glass ceramics.
Methods: Sixty heat-pressed glass ceramic discs were fabricated (diameter = 15 mm; thickness = 1mm) and allocated among four groups (n = 15): IPS e.max Press (E), GC initial LiSi Press (L), Celtra Press (C) and VITA Ambria (A). Each group was subdivided into three subgroups (n=5) according to suggested thermal tempering temperature: NO thermal tempering (T0), thermal tempering at a temperature 9% below the recommended pressing temperature (T1) and thermal tempering at a temperature 5% below the recommended pressing temperature (T2). Biaxial flexural strength was measured. Scanning electron microscope (SEM) was performed for microstructural characterization. To determine the crystalline phases of Lithium disilicates glass-ceramics, X-ray diffraction (XRD) was used. Statistical analysis was then performed.
Results: IPS e.max Press showed the highest mean strength. There was no difference in strength between Celtra Press and VITA Ambria; both showed the lowest mean strength values. Regardless of ceramic type 5% below pressing temperature showed the highest mean strength and No thermal tempering showed the lowest mean strength.
Conclusion: Regarding flexural strength; heat tempering at 5% below the pressing temperature of IPS Emax press showed the highest values. Vita Ambria without heat tempering showed the lowest values.
Keywords
Lithium disilicate; Heat tempering; glass ceramics; Biaxial flexural strength; heat pressed
Statistics
Article View: 268
PDF Download: 220