Study of the morphological alterations to enamel and dentin in human and bovine teeth after irradiation with Er:YAG laser

Autor: Carla Raquel Fontana, Ueide Fernando Fontana, D A M P Malta, J E C Sampaio, V L Bernardes, M F de Andrade
Rok vydání: 2004
Předmět:
Zdroj: Laser Physics Letters. 1:411-416
ISSN: 1612-202X
1612-2011
Popis: 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 10-hertz 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 the 150 mJ/pulse irradiation. The dentin exposed to 250 mJ had 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 heterogeneous as the energy density was increased and that irradiation with 150 mJ/pulse resulted in greater likeness in human and bovine enamel and dentin.
Databáze: OpenAIRE
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