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Войти в исследования The Journal of prosthetic dentistry · 2026
Ultrafast laser noninvasive debonding of ceramic veneers induced by micro-explosion and carbonization.
СтатьяНазвание и аннотация: Перевод в очереди
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Lin Luchan, Zhang Qianyi, Ye Shengjia, Wei Bin, Li Zhuguo, Zeng Li
Аннотация
STATEMENT OF PROBLEM: Removal of a ceramic veneer may become necessary, but whether a noninvasive method for debonding ceramic veneers using ultrafast laser technology is effective is unclear.
PURPOSE: The purpose of this in vitro study was to investigate the effects and mechanisms of ultrafast laser technology in the removal of ceramic veneers.
MATERIAL AND METHODS: An in vitro model for the ceramic veneer-abutment complex was constructed involving the precise deposition of ultrafast laser beams into both the ceramic veneer and adhesive layer. The temperature of the dental pulp was monitored during this process. Shear strength was evaluated, and both surface and cross-sectional morphologies of the specimens were examined with a 3-dimensional (3D) digital microscope and a scanning electron microscope. A Raman spectrometer was used to analyze changes in components within the abutment and ceramic veneers. Data were statistically analyzed with 1-way analysis of variance (ANOVA) (α=.05).
RESULTS: Carbonization and micro-explosion were 2 typical reactions in the adhesive layer, resulting in the reduction of bond strength (P<.05). Under carbonization conditions, the shear strength was typically diminished, falling as low as 1.2 MPa; therefore, veneers can be easily removed from the surface of the teeth. The temperature within the dental pulp can be regulated by adjusting laser parameters and scanning strategies; the shear strength in carbonization mode was significantly less than that in micro-explosion mode, indicating that the carbonization mode was more efficient for veneer removal. Detailed structural characterization further confirmed that the internal dentin was unaffected, suggesting that bioactivity was preserved.
CONCLUSIONS: Ultrafast laser technology offers a convenient, rapid, and safe method of removing ceramic veneers and has potential as a noninvasive procedure.
PURPOSE: The purpose of this in vitro study was to investigate the effects and mechanisms of ultrafast laser technology in the removal of ceramic veneers.
MATERIAL AND METHODS: An in vitro model for the ceramic veneer-abutment complex was constructed involving the precise deposition of ultrafast laser beams into both the ceramic veneer and adhesive layer. The temperature of the dental pulp was monitored during this process. Shear strength was evaluated, and both surface and cross-sectional morphologies of the specimens were examined with a 3-dimensional (3D) digital microscope and a scanning electron microscope. A Raman spectrometer was used to analyze changes in components within the abutment and ceramic veneers. Data were statistically analyzed with 1-way analysis of variance (ANOVA) (α=.05).
RESULTS: Carbonization and micro-explosion were 2 typical reactions in the adhesive layer, resulting in the reduction of bond strength (P<.05). Under carbonization conditions, the shear strength was typically diminished, falling as low as 1.2 MPa; therefore, veneers can be easily removed from the surface of the teeth. The temperature within the dental pulp can be regulated by adjusting laser parameters and scanning strategies; the shear strength in carbonization mode was significantly less than that in micro-explosion mode, indicating that the carbonization mode was more efficient for veneer removal. Detailed structural characterization further confirmed that the internal dentin was unaffected, suggesting that bioactivity was preserved.
CONCLUSIONS: Ultrafast laser technology offers a convenient, rapid, and safe method of removing ceramic veneers and has potential as a noninvasive procedure.