The effects of different Er: YAG laser parameters combined with dole fluorine on dentinal tubules

Abstract

Objective To explore the effects of Er: YAG lasers with different pulse energies and of Er: YAG lasers combined with Duraphat on dentine surface morphology and the dentinal tubule exposure rate, thereby providing a theo⁃ retical basis and parameters for clinically treating dentine hypersensitivity with Er: YAG lasers. Methods Dentinal tu⁃ bule exposure models were divided into five groups, namely, group A (single Er: YAG laser exposure), group B (Du⁃ raphat+ Er: YAG laser), and group C (Er: YAG laser+Duraphat), which were exposed to 6 levels of pulse energy (80 mJ/ P⁃ 250 mJ/P), and experimental control group D (Duraphat group) and blank control group E. Scanning electron micros⁃ copy was used to observe dentine surface morphology and dentinal tubule closure in these groups, and Image⁃Pro Plus 6.0 software was used for image analysis to measure the exposure rates of the five groups of dentinal tubules. Results The dentinal tubule exposure rates for the A⁃D groups were significantly lower than that of the E group (P 0.05), while significant differences existed among the other groups (P C group >B group; under different pulse energies, there existed significant differences between the A and B groups (P 0.05). Conclusion Er: YAG lasers can close the dentinal tubules and play a cooperative role if combined with Duraphat; the effects of laser exposure are better if fluorine is ap⁃ plied beforehand; and dentinal tubule closure is positively correlated with the pulse energy of Er: YAG lasers within a certain energy scope, but when the pulse energy reaches 200 mJ/P, the dentine surface is excessively fused and injured.

Keywords

• Er: YAG laser，
• Pulse，
• Duraphat，
• Dentin surface morphology，
• Dentinal tubule，
• Exposure rates，