Study of the morphological alterations to enamel and dentin in human and bovine teeth after irradiation with Er : YAG laser
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Data
2004-08-01
Autores
Fontana, C. R.
Malta, DAMP
Fontana, U. F.
Sampaio, JEC
Bernardes, V. L.
de Andrade, M. F.
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Editor
Wiley-Blackwell
Resumo
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.
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morphology, enamel, dentin, Er : YAG laser
Como citar
Laser Physics Letters. Weinheim: Wiley-v C H Verlag Gmbh, v. 1, n. 8, p. 411-416, 2004.