RESUMEN
OBJECTIVES@#To coat a zirconia surface with silica-zirconia using a dip-coating technique and evaluate its effect on resin-zirconia shear bond strength (SBS).@*METHODS@#A silica-zirconia suspension was prepared and used to coat a zirconia surface using a dip-coating technique. One hundred and eighty-nine zirconia disks were divided into three groups according to their different surface treatments (polishing, sandblasting, and silica-zirconia coating). Scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD) were used to analyze the differently treated zirconia surfaces. Different primer treatments (Monobond N, Z-PRIME Plus, and no primer) were also applied to the zirconia surfaces. Subsequently, 180 composite resin cylinders (Filtek Z350) were cemented onto the zirconia disks with resin cement (RelyX Ultimate). The SBS was measured after water storage for 24 h or 6 months. The data were analyzed by two-way analysis of variance (ANOVA).@*RESULTS@#SEM and EDX showed that the silica-zirconia coating produced a porous layer with additional Si, and XRD showed that only tetragonal zirconia was on the silica-zirconia-coating surface. Compared with the control group, the resin-zirconia SBSs of the sandblasting group and silica-zirconia-coating group were significantly increased (@*CONCLUSIONS@#Dip-coating with silica-zirconia might be a feasible way to improve resin-zirconia bonding.
RESUMEN
PURPOSE: To investigate the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment on shear bond strength (SBS) between resin cement and colored zirconia made with metal chlorides. MATERIALS AND METHODS: 60 zirconia specimens were divided into 3 groups using coloring liquid. Each group was divided again into 2 sub-groups using plasma treatment; the experimental group was treated with plasma, and the control group was untreated. The sub-groups were: N (non-colored), C (0.1 wt% aqueous chromium chloride solution), M (0.1 wt% aqueous molybdenum chloride solution), NP (non-colored with plasma), CP (0.1 wt% aqueous chromium chloride solution with plasma), and MP (0.1 wt% aqueous molybdenum chloride solution with plasma). Composite resin cylinders were bonded to zirconia specimens with MDP-based resin cement, and SBS was measured using a universal testing machine. All data was analyzed statistically using a 2-way ANOVA test and a Tukey test. RESULTS: SBS significantly increased when specimens were treated with NTAPP regardless of coloring (P<.001). Colored zirconia containing molybdenum showed the highest value of SBS, regardless of NTAPP. The molybdenum group showed the highest SBS, whereas the chromium group showed the lowest. CONCLUSION: NTAPP may increase the SBS of colored zirconia and resin cement. The NTAPP effect on SBS is not influenced by the presence of zirconia coloring.
Asunto(s)
Cloruros , Cromo , Molibdeno , Gases em Plasma , Plasma , Cementos de ResinaRESUMEN
This paper is toevaluate the shear bond strength(SBS)of six new dental adhesives tohuman enamel and dentin.120extracted human premaxillary teeth are randomly divided into12groups with10teeth in each.After24-hours immersion in water at37℃,all specimens are loaded in a shear mode in a tensile testing machine with a crosshead speed of10mm/min.The SBSof six adhesives toenamel are24.6?2.7,17.6?3.5,16.5?3.2,12.8?2.9,10.1?1.8and10.0?2.8Mpa for Clearfil SE Bond,Prompt L-Pop Single Bond,All Bond2,Prime&Bond and Opti Bond Sold respectively.Their SBStodentin are16.8?3.7,10.1?1.4,10.0?2.1,18.6?3.3,10.5?2.5and8.2?1.7Mpa respectively.Toenamel Clearfil SE Bond shows the highest mean SBSand Opti Bond Sold shows the lowest.Todentin the SBSof All Bond2is the highest and Opti Bond Sold is the lowest.
RESUMEN
Objective:To compare shear bond strength(SBS)of bonded and rebonded orthodontic brackets and influence of rebonded orthodontic brackets using different treatment methods on SBS.Methods:60 extracted premolars were evenly divided into three groups.Brackets were debonded with conventional techniques and then removed of residual adhesives from the base mesh using three different treatments.In groupⅠ,rebond a new bracket at the second,third bonding times.In group Ⅱ,remove residual adhesives from the base mesh with fire at the second,third times,then rebond the same bracket.In group Ⅲ,remove that using a tungsten carbide bur at the second,third times,then rebond the same bracket.Shear test was performed to compare the SBS and adhesive remnant indexes(ARI)among different groups.Results:The SBS of three groups at the first bonding sequence were(10.00?2.95)MPa,(9.57?2.45)MPa and(9.09?2.58)MPa.The SBS at the second,third debonding sequence in group I,group II,and group III were(9.55?2.84)MPa and(10.32?2.59)MPa,(7.30?2.15)MPa and(7.14?1.93)MPa,(12.13?2.93)MPa and(12.86?3.08)MPa,respectively.In group Ⅱ,the SBS was significantly lower,however,in group Ⅲ,the SBS was significantly higher,and the results showed significant differences(P