Thermal effects and morphological aspects of human dentin surface irradiated with different frequencies of Er:YAG laser
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
---|---|
Data(s) |
07/11/2013
07/11/2013
2012
|
Resumo |
This study reports the effects on micromorphology and temperature rise in human dentin using different frequencies of Er:YAG laser. Sixty human dentin fragments were randomly assigned into two groups (n = 30): carious or sound dentin. Both groups were divided into three subgroups (n = 10), according to the Er:YAG laser frequency used: 4, 6, or 10 Hz (energy: 200 mJ; irradiation distance: 12 mm; and irradiation time: 20 s). A thermocouple adapted to the tooth fragment recorded the initial temperature value (degrees C); then, the temperature was measured after the end of the irradiation (20 s). Morphological analysis was performed using images obtained with scanning electron microscope. There was no difference between the temperatures obtained with 4 and 6 Hz; the highest temperatures were achieved with 10 Hz. No difference was observed between carious and sound dentin. Morphological analyses revealed that all frequencies promoted irregular surface in sound dentin, being observed more selectively ablation especially in intertubular dentin with tubule protrusion. The caries dentin presented flat surface for all frequencies used. Both substrates revealed absence of any signs of thermal damage. It may be concluded that the parameters used in this study are capable to remove caries lesion, having acceptable limits of temperature rise and no significant morphological alterations on dentin surface. Microsc. Res. Tech. 2012. (c) 2012 Wiley Periodicals, Inc. CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior), Brazil |
Identificador |
MICROSCOPY RESEARCH AND TECHNIQUE, HOBOKEN, v. 75, n. 10, pp. 1370-1375, OCT, 2012 1059-910X http://www.producao.usp.br/handle/BDPI/42813 10.1002/jemt.22076 |
Idioma(s) |
eng |
Publicador |
WILEY-BLACKWELL HOBOKEN |
Relação |
MICROSCOPY RESEARCH AND TECHNIQUE |
Direitos |
closedAccess Copyright WILEY-BLACKWELL |
Palavras-Chave | #ER:YAG LASER #DENTIN ABLATION #DENTAL CARIES #ER-YAG LASER #PULSE REPETITION RATE #TEMPERATURE RISE #CARIES REMOVAL #ABLATION RATE #ERYAG LASER #IN-VITRO #INTRAPULPAL TEMPERATURE #CAVITY PREPARATION #GARNET LASER #ANATOMY & MORPHOLOGY #BIOLOGY #MICROSCOPY |
Tipo |
article original article publishedVersion |