RESUMEN
This study aimed to investigate the shear bond strength of an autopolymerizing resin to a nylon denture base polymer (Lucitone FRS: LT) subjected to different surface treatments, and the results thereof compared with a heat-polymerizing resin and a polycarbonate polymer. Specimens were divided into five groups according to the surface treatment method: polishing (#600), sandblasting, adhesive primer application (resin primer), sandblasting + adhesive primer application, and tribochemical coating (Rocatec system). Following which, specimens were subjected to a shear bond strength test and Si concentrations were measured using an electron probe microanalyzer (EPMA). On shear bond strength, that of LT with tribochemical coating was significantly higher than the other groups. On EPMA results, the surface of LT with tribochemical coating was found to be covered with a silica film. Therefore, findings in this study indicated that silica-coating by Rocatec system was effective in improving the bond strength of nylon denture base polymer to autopolymerizing repair resin.
Asunto(s)
Cementos Dentales/química , Bases para Dentadura , Reparación de la Dentadura , Cementos de Resina , Auto-Curación de Resinas Dentales , Resinas Acrílicas , Materiales Biocompatibles Revestidos , Análisis del Estrés Dental , Microanálisis por Sonda Electrónica , Ensayo de Materiales , Nylons , Cemento de Policarboxilato , Resistencia al Corte , Silanos , Dióxido de Silicio/análisis , Propiedades de SuperficieRESUMEN
This study evaluated the effectiveness of a simplified silica coating method (CoJet System) on the bonding strength of resin cements to dental alloy. Bonding strength of the specimens treated with metal primer after alumina sandblasting was compared with those treated with silica coating and silane coupling agent after alumina sandblasting. Furthermore, the influence of silane coupling agent on bonding strength was compared between one-liquid and two-liquid silane coupling agents. Measurement of shear bond strength before and after thermal cycling revealed that the group treated with silica coating in one step without alumina sandblasting yielded high bonding strength. As for the influence of silane coupling agent, treatment with two-liquid silane coupling agent achieved higher mean shear bond strength than with one-liquid silane coupling agent. Findings in this study indicated that silicatization by means of this simplified silica coating method was effective in improving the bonding strength to dental alloy.
Asunto(s)
Materiales Biocompatibles Revestidos/química , Aleaciones Dentales/química , Recubrimiento Dental Adhesivo , Cementos de Resina/química , Dióxido de Silicio/química , Óxido de Aluminio/química , Compuestos Inorgánicos de Carbono/química , Grabado Dental/métodos , Materiales Dentales/química , Pulido Dental/métodos , Microanálisis por Sonda Electrónica , Humanos , Ensayo de Materiales , Resistencia al Corte , Silanos/química , Compuestos de Silicona/química , Estrés Mecánico , Propiedades de Superficie , Temperatura , Factores de TiempoRESUMEN
The purpose of this study was to investigate the effect of irradiation on the polymerization behavior of a bonding agent of a dual-cured self-etching bonding system. By means of electron spin resonance spectroscopy, it was shown that the concentration of polymer radicals in samples cured chemically without irradiation was closely similar to that in samples dual-cured under irradiation. There was no significant difference in the time required to reach the maximum spin concentration between these two sample groups, thereby showing that the radical generation rates were similar. Findings of this study revealed that the dual-cured self-etching bonding system tested in this study was effective in polymerization in regions where irradiated light could hardly reach.