Pulsed Nd:YAG laser-aided debonding for removing the metal brackets / 中华口腔医学杂志
Chinese Journal of Stomatology
;
(12): 407-410, 2010.
Artigo
em Chinês
| WPRIM
| ID: wpr-243162
ABSTRACT
<p><b>OBJECTIVE</b>To explore the possibility of pulsed NdYAG laser-aided debonding for removing orthodontic metal brackets and to compare the method with the conventional mechanical debonding method.</p><p><b>METHODS</b>Fifty healthy premolars extracted for orthodontic purpose were randomly divided into five groups (10 teeth in each group). There were four experimental groups and one control group. Every tooth was bonded with bracket. Laser was used to irradiate the teeth in experimental groups with different electric currents (13.0, 13.5, 14.0, 14.5 A). During the irradiation, the brackets received 4.9 N of force until the brackets off. The time needed for debonding and the temperature change of the pulp cavity were recorded. The teeth in control group were debonded using mechanical method. The adhesive remnant index (ARI) was calculated using stereomicroscope and imagetool software. All samples were examined with a scanning electron microscope.</p><p><b>RESULTS</b>The time taken between the four groups were (67.70 ± 7.18), (35.90 ± 4.28), (24.90 ± 3.76), (6.90 ± 2.33) s, highly statistical difference was found in the time needed for debonding (P < 0.01). The temperature in the pulp cavity among the four groups were (20.97 ± 3.10), (12.75 ± 3.14), (8.99 ± 2.47), (2.91 ± 1.88)°C, and statistical differences were found in temperature change of the pulp cavity (P < 0.05). ARI of three experimental groups and the control group were (8.55 ± 5.02)%, (15.42 ± 7.37)%, (5.55 ± 3.79)%, (13.72 ± 6.69)%, and (74.36 ± 29.44)%. The enamel surface of the control group was coarse with deep scratchs. The enamel surface was smooth and clean in the experimental groups.</p><p><b>CONCLUSIONS</b>Pulsed NdYAG laser-aided debonding for removing metal brackets was feasible. Laser-aided debonding was better than conventional mechanical debonding method. The method reduced the damage to the enamel surface.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Braquetes Ortodônticos
/
Descolagem Dentária
/
Esmalte Dentário
/
Lasers de Estado Sólido
/
Métodos
Limite:
Humanos
Idioma:
Chinês
Revista:
Chinese Journal of Stomatology
Ano de publicação:
2010
Tipo de documento:
Artigo
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