Ablation of carious dental tissue using an ultrashort pulsed laser (USPL) system.
Lasers Med Sci
; 30(5): 1427-34, 2015 Jul.
Article
em En
| MEDLINE
| ID: mdl-24865391
ABSTRACT
The aim of the study was to investigate the efficiency of caries removal employing an ultrashort pulsed laser (USPL) and to compare the results regarding to the ablation rate of sound enamel and dentin including surface texture. The study was performed with 59 freshly extracted carious human teeth. Two cavities with an edge length of 1 × 1 mm per tooth were created one in the dental decay and one in sound hard tissue. For this purpose a 9-W NdYVO4 laser with a center wavelength of 1,064 nm and a pulse duration of 8 ps at a repetition rate of 500 kHz was used. A scanner system moved the laser beam across the surface with a scan speed of 2,000 mm/s. Ablated volume and roughness R z of the cavity ground were measured using an optical profilometer. Subsequently, the specimens were cut to undecalcified sections for histological investigations. The removal of dental decay (dentin, 14.9 mm(3)/min; enamel, 12.8 mm(3)/min) was significantly higher (p < 0.05) compared to the removal of sound tissues (dentin, 4.2 mm(3)/min; enamel, 3.8 mm(3)/min). The arithmetic means of the surface roughness R z were 8.5 µm in carious enamel, 15.43 µm in carious dentin, 4.83 µm in sound enamel and 5.52 µm in sound dentin. Light microscopic investigations did not indicate any side effects in the surrounding tissues. Regarding the ablation rate of dental decay using the USPL system, caries removal seems to be much more efficient for cavity preparation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cárie Dentária
/
Preparo da Cavidade Dentária
/
Lasers de Estado Sólido
Limite:
Humans
Idioma:
En
Revista:
Lasers Med Sci
Assunto da revista:
BIOTECNOLOGIA
/
RADIOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Alemanha