RESUMO
This study examined the antimicrobial/antifungal ability of a tissue conditioner containing a photocatalyst for Escherichia coli, Streptococcus mutans, Staphylococcus aureus and Candida albicans. The photocatalyst was mixed with tissue conditioners powders at concentrations of 0, 10, 15, and 20 wt%. Tissue conditioners powders containing a photocatalyst were mixed with liquid to make test specimens. Test specimens inoculated by each microorganism were irradiated by ultraviolet light for 0-, 2- and 4 hours. The antimicrobial/antifungal effects were evaluated by the CFU technique. The CFU values of each microorganism for tissue conditioners containing a photocatalyst showed significant decrease following UV-irradiation. The improvement in antimicrobial/antifungal effects was concomitant with the increase of the mixing ratio and the irradiation time. Therefore, the results indicated that tissue conditioners containing a photocatalyst might have photocatalytic ability.
Assuntos
Anti-Infecciosos/farmacologia , Antifúngicos/farmacologia , Materiais Dentários/química , Condicionamento de Tecido Mole Oral , Carga Bacteriana/efeitos dos fármacos , Carga Bacteriana/efeitos da radiação , Candida albicans/efeitos dos fármacos , Candida albicans/efeitos da radiação , Contagem de Colônia Microbiana , Ácidos Dicarboxílicos/química , Durapatita/química , Escherichia coli/efeitos dos fármacos , Escherichia coli/efeitos da radiação , Humanos , Teste de Materiais , Metilmetacrilatos/química , Processos Fotoquímicos , Plastificantes/química , Staphylococcus aureus/efeitos dos fármacos , Staphylococcus aureus/efeitos da radiação , Streptococcus mutans/efeitos dos fármacos , Streptococcus mutans/efeitos da radiação , Fatores de Tempo , Titânio/química , Raios UltravioletaRESUMO
A newly designed, light-curing adhesive was investigated for its bonding effectiveness to porcelain, alumina, zirconia, Au, Au alloy, Ag alloy, Au-Ag-Pd alloy, and Ni-Cr alloy. Four experimental adhesives were prepared using varying contents of the following: a silane coupling agent [3-methacryloyloxypropyltriethoxysilane (3-MPTES)], acidic adhesive monomers [6-methacryloyloxyhexyl phosphonoacetate(6-MHPA),6-methacryloyloxyhexyl3-phosphonopropionate(6-MHPP)and 4-methacryloyloxyethoxycarbonylphthalic acid (4-MET)], and dithiooctanoate monomers [6-methacryloyloxyhexyl 6,8-dithiooctanoate (6-MHDT) and 10-methacryloyloxydecyl 6,8-dithiooctanoate (10-MDDT)]. After all adherend surfaces were sandblasted and applied with an experimental adhesive, shear bond strengths (SBSs) of a light-curing resin composite (Beautifil II, Shofu Inc., Kyoto, Japan) to the adherend materials after 2,000 times of thermal cycling were measured. For the experimental adhesive which contained 3-MPTES (30.0 wt%), 6-MHPA (1.0 wt%), 6-MHPP (1.0 wt%), 4-MET (1.0 wt%), 6-MHDT (0.5 wt%) and 10-MDDT (0.5 wt%), it consistently yielded the highest SBS for all adherend surfaces in the range of 20.8 (4.8)-30.3 (7.9) MPa, with no significant differences among all the adherend materials (p>0.05). Therefore, the newly designed, multi-purpose, light-curing adhesive was able to deliver high SBS to all the adherend materials tested.
Assuntos
Caprilatos/química , Ligas Dentárias/química , Cimentos Dentários/química , Porcelana Dentária/química , Cura Luminosa de Adesivos Dentários , Metacrilatos/química , Silanos/química , Óxido de Alumínio/química , Bis-Fenol A-Glicidil Metacrilato/química , Ligas de Cromo/química , Resinas Compostas/química , Corrosão Dentária/métodos , Ligas de Ouro/química , Humanos , Teste de Materiais , Organofosfonatos/química , Paládio/química , Ácido Fosfonoacéticos/análogos & derivados , Ácido Fosfonoacéticos/química , Ácidos Ftálicos/química , Polietilenoglicóis/química , Ácidos Polimetacrílicos/química , Propionatos/química , Resistência ao Cisalhamento , Prata/química , Estresse Mecânico , Propriedades de Superfície , Temperatura , Ítrio/química , Zircônio/químicaRESUMO
This study investigated the bonding efficacy of a combined primer application which comprised a silane coupling agent, an acidic adhesive monomer, and a dithiooctanoate monomer, as well as the influence of shelf life on bonding. Five experimental primers (coded as Si-P-SS-1 to Si-P-SS-4, and Si-SS as the control) were prepared using 20.0-40.0 wt% 3-methacryloyloxypropyltriethoxysilane (3-MPTES), 0-7.44 wt% 6-methacryloyloxyhexyl phosphonoacetate (6-MHPA), and 0.50 wt% 10-methacryloyloxydecyl 6,8-dithiooctanoate (10-MDDT). After 24-hour storage at 23°C (Initial) and 2-month storage at 50°C (Aged), tensile bond strengths (TBSs) of a resin cement (ResiCem, Shofu Inc., Kyoto, Japan) to primer-treated porcelain, alumina, zirconia, and Au alloy were measured. With the Initial and Aged primers of Si-P-SS-1 to Si-P-SS-3, there were no statistically significant differences in the mean TBSs (MPa) [porcelain: 21.7-29.2; alumina: 21.4-25.3; zirconia: 20.3-24.5; and Au alloy: 23.4-27.6] among these three primers (p>0.05), but they were significantly higher than that of the control primer (p<0.05). The experimental primers Si-P-SS-1 to Si-P-SS-3 demonstrated good potential as multi-purpose primers: they had good shelf lives as single-bottle primer systems and were thus able to exhibit good bond strength to all the adherends tested after 2-month storage under accelerated aging conditions.
