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HISTOLOGICAL AND SEM ANALYSIS OF ROOT CEMENTUM FOLLOWING IRRADIATION WITH ER:YAG AND CO2 LASERS
Alteration
Microstructure
Er:YAG laser
CO2 laser
Ultrasonic scaler
Raspagem Dentária
Desenho de Equipamento
Técnicas In Vitro
Microscopia Eletrônica de Varredura
Espectrometria por Raios X
Estatísticas não Paramétricas
Raiz Dentária
Propriedades de Superfície
Autor
Afiliación
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan / Tokyo Medical and Dental University. Program, International Research Center for Molecular Science in Tooth and Bone Diseases. Global Center of Excellence. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Research Center for Medical and Dental Sciences Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Brasilia University. Department of Dentistry. Brasília, DF, Brazil.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan / Tokyo Medical and Dental University. Program, International Research Center for Molecular Science in Tooth and Bone Diseases. Global Center of Excellence. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan / Tokyo Medical and Dental University. Program, International Research Center for Molecular Science in Tooth and Bone Diseases. Global Center of Excellence. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Research Center for Medical and Dental Sciences Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Brasilia University. Department of Dentistry. Brasília, DF, Brazil.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan / Tokyo Medical and Dental University. Program, International Research Center for Molecular Science in Tooth and Bone Diseases. Global Center of Excellence. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan.
Tokyo Medical and Dental University. Graduate School of Medical and Dental Sciences. Department of Periodontology. Tokyo, Japan / Tokyo Medical and Dental University. Program, International Research Center for Molecular Science in Tooth and Bone Diseases. Global Center of Excellence. Tokyo, Japan.
Resumen en ingles
Recently, the Er:YAG and CO2 lasers have been
applied in periodontal therapy. However, the characteristics
of laser-irradiated root cementum have not been fully analyzed.
The aim of this study was to precisely analyze the
alterations of root cementum treated with the Er:YAG and
the CO2 lasers, using non-decalcified thin histological sections.
Eleven cementum plates were prepared from extracted
human teeth. Pulsed Er:YAG laser contact irradiation was
performed in a line at 40 mJ/pulse (14.2 J/cm2/pulse) and
25 Hz (1.0 W) under water spray. Continuous CO2 laser
irradiation was performed in non-contact mode at 1.0 W,
and ultrasonic instrumentation was performed as a control.
The treated samples were subjected to stereomicroscopy,
scanning electron microscopy (SEM), light microscopy
and SEM energy dispersive X-ray spectroscopy (SEMEDS).
The Er:YAG laser-treated cementum showed minimal
alteration with a whitish, slightly ablated surface,
whereas CO2 laser treatment resulted in distinct carbonization.
SEM analysis revealed characteristic microirregularities
of the Er:YAG-lased surface and the melted,
resolidified appearance surrounded by major and microcracks
of the CO2-lased surface. Histological analysis
revealed minimal thermal alteration and structural degradation
of the Er:YAG laser-irradiated cementum with an affected
layer of approximately 20-μm thickness, which
partially consisted of two distinct affected layers. The
CO2-lased cementum revealed multiple affected layers
showing different structures/staining with approximately
140 μm thickness. Er:YAG laser irradiation used with water
cooling resulted in minimal cementum ablation and thermal
changes with a characteristic microstructure of the superficial
layer. In contrast, CO2 laser irradiation produced severely
affected distinct multiple layers accompanied by
melting and carbonization.
Palabras clave en ingles
CementumAlteration
Microstructure
Er:YAG laser
CO2 laser
Ultrasonic scaler
DeCS
Cemento DentárioRaspagem Dentária
Desenho de Equipamento
Técnicas In Vitro
Microscopia Eletrônica de Varredura
Espectrometria por Raios X
Estatísticas não Paramétricas
Raiz Dentária
Propriedades de Superfície
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