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ES Journal of Dental Sciences

ISSN: 2768-0126

The Effects of Laser Radiation on Exposed Dentine Surfaces in the Treatment of Dentine Sensitivity. An In Vitro Study

  • Research Article

  • McCarthy D1, Pearson GJ2 , Palmer G2, Gillam DG1,3
  • 1Departments of Periodontology and 2Biomaterials & Tissue Engineering, Eastman Dental Institute for Oral HealthCare Sciences, London, UK
  • 3Oral Bioengineering, Barts and the London School of Medicine and Dentistry, QMUL, London, UK
  • *Corresponding author: David G. Gillam, Oral Bioengineering, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, QMUL, London, UK
  • Received: Nov 17, 2020; Accepted: Dec 28, 2020; Published: Dec 30, 2020


Aim: This in vitro pilot study was undertaken to investigate the effects of Neodymium: Yttrium Aluminium Garnet (Nd:YAG), Erbium: Yttrium Aluminium Garnet (Er:YAG) and Helium Neon (HeNe) laser radiation on dentine surfaces in extracted human teeth.

Material and Methods: Instrumented root surfaces and etched and unetched dentine discs were irradiated with a Nd:YAG laser operating at 3.5, 3.75 or 4W or an Er:YAG laser operating at 60, 80, 100mJ or with a HeNe laser.

Results: The Nd:YAG laser produced melting and resolidification of dentine on all surfaces while the Er:YAG laser produced craters with closed tubules in root surfaces, but open tubules in dentine discs. The HeNe laser produced no apparent surface alteration. Both lased and unlased control surfaces were compared using Scanning Electron Microscopy (SEM).

Conclusions: Irradiation with the Nd:YAG and Er:YAG lasers caused significant disruption of the dentine surfaces on both root surfaces and also on dentine discs. Nd:YAG radiation produced irregular melting and resolidification of the dentine surface with some occlusion of open dentine tubules. Er:YAG radiation caused ablation of dentine and produced craters with open tubules in the dentine discs, but closed tubules on most root surfaces. Irradiation using a HeNe laser produced no noticeable surface effect.


Dentine Sensitivity; Er:YAG & Nd:YAG Laser; Scanning Electron Microscopy