Preliminary Study on the Optimization of Femtosecond Laser Treatment on the Surface Morphology of Lithium Disilicate Glass-Ceramics and Highly Translucent Zirconia Ceramics

Masanao Inokoshi, Kumiko Yoshihara, Masayuki Kakehata, Hidehiko Yashiro, Noriyuki Nagaoka, Watcharapong Tonprasong, Kaiqi Xu, Shunsuke Minakuchi

Research output: Contribution to journalArticlepeer-review

Abstract

All-ceramic restorations have become increasingly popular in dentistry. Toward ensuring that these restorations adhere to the tooth structure, this study determines the optimal femtosecond laser (FL) treatment parameters for lithium disilicate glass-ceramics and highly translucent zirconia ceramics with respect to surface morphology. For both the ceramics, the following surface conditions were investigated: (1) as-sintered; (2) Al2 O3 sandblasted; (3) FL treatment (dot pattern with line distances of 14, 20, and 40 µm); (4) FL treatment (crossed-line pattern with a line distance of 20 and 40 µm). Surface roughness parameters were estimated using a 3D confocal laser microscope; microstructures were analyzed using a scanning electron microscope. Peak fluence (Fpeak) values of 4 and 8 J/cm2 and irradiation numbers (N) of 20 and 10 shots were selected to create dot patterns in highly translucent zirconia and lithium disilicate glass-ceramics, respectively. Furthermore, Fpeak = 8 J/cm2 and N = 20 shots were chosen to obtain crossed-line patterns in both ceramics. Our results show that lithium disilicate glass-ceramics and highly translucent zirconia exhibit a similar surface morphology under each of the surface treatment conditions. Therefore, FL irradiation of dot or crossed-line patterns (at a distance of 20 and 40 µm) are potential candidates for future investigations.

Original languageEnglish
Article number3614
JournalMaterials
Volume15
Issue number10
DOIs
Publication statusPublished - May 1 2022

Keywords

  • femtosecond laser
  • irradiation
  • lithium disilicate
  • surface roughness
  • zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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