Tianzhen Zhao
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Tianzhen Zhao has a total of 10 co-authors. Here are the top co-authors by number of shared publications:
- Huaping Wu
College of Mechanical Engineering, Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou, China
2 shared publications - Jianhua Yao
Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, China
2 shared publications - Ling Wu
College of Mechanical Engineering, Zhejiang University of Technology 1 , Hangzhou 310023
2 shared publications - Lisha Fan
College of Mechanical Engineering Zhejiang University of Technology Hangzhou China
2 shared publications - Shuowen Zhang
College of Mechanical Engineering, Zhejiang University of Technology 1 , Hangzhou 310023
2 shared publications - Xiaoyu Ding
College of Mechanical Engineering, Zhejiang University of Technology 1 , Hangzhou 310023
2 shared publications
Latest Publications
- 24 March 2025
- Published by Laser Institute of America in Journal of Laser Applications
- Vol. 37 (2)
Enhanced shear bond strength of ceramic orthodontic brackets with laser surface texturing
The insufficient bond strength between a rigid ceramic bracket and an enamel leads to bracket detachment and orthodontic treatment failure. In this work, a laser-based engineering route with high controllability, high efficiency, and low cost is applied to texture ceramic brackets with surface microstructures to introduce mechanical retention for improved bonding between ceramic brackets and enamels. The influence of the structural features of surface microstructure on the shear bond strength (SBS) of laser-textured ceramic brackets with enamels is systematically studied. The maximum SBS value of 575 ± 25.16 N is obtained for a ceramic bracket that is textured with a surface grid pattern that has a grid size of 80 μm and a groove depth of 37 μm. This SBS value is about four times higher than an untreated bracket. A bracket-resin-enamel model is established to theoretically understand the stress distribution and mechanical behavior of the system under a shear load. The theoretical simulation results evidence concentrated stress at the groove area, suggesting the formation of mechanical retention. The development of a laser surface texturing method to improve the bonding strength of ceramic brackets could promote the bonding reliability of ceramic brackets in orthodontic treatment.
- 24 March 2025
- Published by Laser Institute of America in Journal of Laser Applications
- Vol. 37 (2)
Enhanced shear bond strength of ceramic orthodontic brackets with laser surface texturing
The insufficient bond strength between a rigid ceramic bracket and an enamel leads to bracket detachment and orthodontic treatment failure. In this work, a laser-based engineering route with high controllability, high efficiency, and low cost is applied to texture ceramic brackets with surface microstructures to introduce mechanical retention for improved bonding between ceramic brackets and enamels. The influence of the structural features of surface microstructure on the shear bond strength (SBS) of laser-textured ceramic brackets with enamels is systematically studied. The maximum SBS value of 575 ± 25.16 N is obtained for a ceramic bracket that is textured with a surface grid pattern that has a grid size of 80 μm and a groove depth of 37 μm. This SBS value is about four times higher than an untreated bracket. A bracket-resin-enamel model is established to theoretically understand the stress distribution and mechanical behavior of the system under a shear load. The theoretical simulation results evidence concentrated stress at the groove area, suggesting the formation of mechanical retention. The development of a laser surface texturing method to improve the bonding strength of ceramic brackets could promote the bonding reliability of ceramic brackets in orthodontic treatment.
- 1 February 2025
- Published by Laser Institute of America in Journal of Laser Applications
- Vol. 37 (1)
Microgratings fabricated with laser-induced plasma-assisted deposition and laser subtractive patterning
Laser-induced plasma-assisted deposition (LIPAD) is an efficient and low-cost method for processing thin films on transparent substrates, but it is difficult to control in terms of edge evenness, chemical composition homogeneity, and geometric precision. Here, a donor target of stainless steel 316 is used in the LIPAD process to fabricate a homogenous thin film on a glass plate. The effects of laser parameters on the structural and chemical characteristics of the films are systematically investigated. The experimental results show that the density of spherical particles reduces and the particle size shrinks as laser scanning distance increases. The influence of laser scanning distance on the chemical structures of LIPAD films is studied by Raman spectroscopy and x-ray diffraction. Microgratings with precisely defined size are fabricated from the LIPAD thin films by a laser subtractive patterning step, and grating constants retrieved from the optical diffraction experiment match well with the measured strip spacing, envisioning the feasibility of LIPAD in efficient production of microgratings.
- 1 February 2025
- Published by Laser Institute of America in Journal of Laser Applications
- Vol. 37 (1)
Microgratings fabricated with laser-induced plasma-assisted deposition and laser subtractive patterning
Laser-induced plasma-assisted deposition (LIPAD) is an efficient and low-cost method for processing thin films on transparent substrates, but it is difficult to control in terms of edge evenness, chemical composition homogeneity, and geometric precision. Here, a donor target of stainless steel 316 is used in the LIPAD process to fabricate a homogenous thin film on a glass plate. The effects of laser parameters on the structural and chemical characteristics of the films are systematically investigated. The experimental results show that the density of spherical particles reduces and the particle size shrinks as laser scanning distance increases. The influence of laser scanning distance on the chemical structures of LIPAD films is studied by Raman spectroscopy and x-ray diffraction. Microgratings with precisely defined size are fabricated from the LIPAD thin films by a laser subtractive patterning step, and grating constants retrieved from the optical diffraction experiment match well with the measured strip spacing, envisioning the feasibility of LIPAD in efficient production of microgratings.