Effect of a multi-layer infection control barrier on the micro-hardness of a composite resin
J. appl. oral sci
; J. appl. oral sci;20(5): 576-580, Sept.-Oct. 2012. tab
Article
em En
| LILACS
| ID: lil-654924
Biblioteca responsável:
BR1.1
ABSTRACT
OBJECTIVE:
The aim of this study was to evaluate the effect of multiple layers of an infection control barrier on the micro-hardness of a composite resin. MATERIAL ANDMETHODS:
One, two, four, and eight layers of an infection control barrier were used to cover the light guides of a high-power light emitting diode (LeD) light curing unit (LCU) and a low-power halogen LCU. The composite specimens were photopolymerized with the LCUs and the barriers, and the micro-hardness of the upper and lower surfaces was measured (n=10). The hardness ratio was calculated by dividing the bottom surface hardness of the experimental groups by the irradiated surface hardness of the control groups. The data was analyzed by two-way ANOVA and Tukey's HSD test.RESULTS:
The micro-hardness of the composite specimens photopolymerized with the LED LCU decreased significantly in the four- and eight-layer groups of the upper surface and in the two-, four-, and eight-layer groups of the lower surface. The hardness ratio of the composite specimens was <80% in the eight-layer group. The micro-hardness of the composite specimens photopolymerized with the halogen LCU decreased significantly in the eight-layer group of the upper surface and in the two-, four-, and eight-layer groups of the lower surface. However, the hardness ratios of all the composite specimens photopolymerized with barriers were <80%.CONCLUSIONS:
The two-layer infection control barrier could be used on high-power LCUs without decreasing the surface hardness of the composite resin. However, when using an infection control barrier on the low-power LCUs, attention should be paid so as not to sacrifice the polymerization efficiency.Palavras-chave
Texto completo:
1
Índice:
LILACS
Assunto principal:
Resinas Compostas
/
Controle de Infecções Dentárias
/
Lâmpadas de Polimerização Dentária
Limite:
Humans
Idioma:
En
Revista:
J. appl. oral sci
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article