Article Sidebar

PDF
Date Published: 07/08/2021
Abstract Views: 269
Views PDF: 144
DOI: https://doi.org/10.51298/vmj.v504i1.883
Issue
Vol. 504 No. 1 (2021)
Section
Các bài báo
How to Cite
Lê Khoa, T. ., & Xuân Vĩnh, T. . (2021). THE VICKERS HARDNESS AND SURFACE STRUCTURE OF LITHIUM DISILICATE CERAMIC BEFORE AND AFTER HYDROFLUORIC ACID TREATMENT. Vietnam Medical Journal, 504(1). https://doi.org/10.51298/vmj.v504i1.883

THE VICKERS HARDNESS AND SURFACE STRUCTURE OF LITHIUM DISILICATE CERAMIC BEFORE AND AFTER HYDROFLUORIC ACID TREATMENT

Trần Lê Khoa1, Trần Xuân Vĩnh1,
1 University of Medicine and Pharmacy at Ho Chi Minh City

Main Article Content

Abstract

Objective: The study was to evaluate the Vickers Hardness and the surface structure of lithium disilicate glass ceramics before and after treatment with 5% hydrofluoric acid (HF). Methods: Fifty-two round lithium disilicate ceramic discs of 4 × 2mm (26 discs of GC Initial Lisi Press-LP and 26 discs of IPS E.max Press-EP) was prepared by heat-pressing technique. Half of each group then were etched with 5% HF in 20 seconds after surface polishing. Then, 40 ceramic discs were used for Vickers Hardness evaluation and 12 ceramic discs were used to observe the surface structure using scanning electron microscope (SEM). Results: After surface treatment with 5% HF, the Vickers Hardness of the two groups decreased significantly and Vickers Hardness of LP group was significantly higher than that of EP group. SEM observation showed the surface of LP group have smaller sized lithium disilicate crystals and more uniform than that of EP group. Conclusion: The surface treatment with 5% HF decreased the Vickers Hardness of lithium disilicate ceramics and the surface hardness of LP was higher than that of EP.

Article Details

Keywords

Vickers Hardness, scanning electron microscope, hydrofluoric acid, lithium disilicate ceramic

References

1. Nikzad S, Azari A, Dehgan S. (2010). "Ceramic (Feldspathic & IPS Empress II) vs. laboratory composite (Gradia) veneers; a comparison between their shear bond strength to enamel; an in vitro study". Journal of oral rehabilitation. 37 (7), pp 569-574.
2. Xiaoping L, Dongfeng R, Silikas N . (2014). "Effect of etching time and resin bond on the flexural strength of IPS e.max Press glass ceramic". Dental Materials. 30 (12), pp. e330-e336.
3. Kurian BP, Johns M, Hareesh MT. (2018). "Lithium Disilicate Ceramic – An Overview". The Journal of Prosthetic and Implant Dentistry. 1 (2)
4. Carrabba M. et al. (2017). "Flexural strength of CAD/CAM and pressed novel lithium disilicate". Journal Of Oral and Craniofacial Biomaterials Sciences. 33, pp. e16.
5. Prochnow C, Venturini A B, Grasel R, Gundel A, Bottino M C, Valandro L F. (2018), "Adhesion to a Lithium Disilicate Glass Ceramic Etched with Hydrofluoric Acid at Distinct Concentrations". Brazilian Dental Journal. 29 (5), pp. 492-499.
6. Kalavacharla V K, Lawson N C, Ramp L C, Burgess J O. (2015), "Influence of Etching Protocol and Silane Treatment with a Universal Adhesive on Lithium Disilicate Bond Strength". Oper Dent. 40 (4), pp. 372-378.
7.Sakaguchi R. et al. (2011). Craig's Restorative Dental Materials, 13th Edition -Mosby (2011), Vol. 11.
8. Rawls KJ: Mechanical properties of dental materials In Anusavice KJ (ed): Phillips’ Science of Dental Materials (ed 11). St. Louis, W.B. Saunders, 2003, pp. 69-143
9. Hallmann L, Ulmer P, Gerngross MD, Jetter J, Mintrone M, Lehmann F, Kern M. Properties of hot-pressed lithium silicate glass-ceramics. (2019). Dental materials. 35, 713–729