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Study of the morphological alterations to enamel and dentin in human and bovine teeth after irradiation with Er : YAG laser
  • Inst Phys Sao Carlos
  • Universidade Estadual Paulista (UNESP)
  • Fac Dent Barretos
Objective: the purpose of this study is to make use of scanning electron microscopy in order to comparatively analyze the morphological alterations to human and bovine enamel and dentin. Earlier data: Many a morphological study involving Er:YAG laser can be found in the literature. Still, not a single study comparing the effects of this infrared laser in human and bovine teeth has been reported. Materials and Methods: Thirty-two slices of human and bovine enamel and dentin were evenly divided into four groups. With the exception of the control group, the samples were irradiated with Er:YAG laser, focused at a distance of 12 mm and a 10-Hz frequency, with 150, 250, and 350 mJ of output energy per pulse for 10 seconds. After irradiation all specimens were observed under a scanning electron microscope. Results: There was practically no morphological difference for those samples that underwent 150 mJ/pulse irradiation. The dentin exposed to 250 mJ had a few open dentinal tubules. These were seen in enamel after a 350 mJ irradiation, in which the energy was able to reach the dentin. Conclusions: the breadth of this study allows us to state that the pattern between the species grew more heterogenous as the energy density was increased and that irradiation with 150 mJ/pulse resulted in greater likeness in human and bovine enamel and dentin.
Issue Date: 
Laser Physics Letters. Weinheim: Wiley-v C H Verlag Gmbh, v. 1, n. 8, p. 411-416, 2004.
Time Duration: 
  • morphology
  • enamel
  • dentin
  • Er : YAG laser
Access Rights: 
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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