ABSTRACT
PURPOSE: The aims of this study were to evaluate the effect of a resin coating on the shear bond strength of indirect composite restoration bonded to dentin with a self adhesive resin cement and to compare the shear bond strength with that of a conventional resin cement. MATERIALS AND METHODS: The occlusal enamels of thirty six extracted non-carious human molars were removed until the dentin flat surfaces of the teeth were exposed. Then, they were divided into 3 groups. The dentin surfaces of group 1 and 3 were left without any conditioning, while the dentin surfaces of group 2 were resin-coated with Clearfil SE bond and a flowable resin composite, Metafil Flo. After all specimens were temporized for 24 hours, indirect composite resin blocks fabricated by Tescera were bonded to dentins by Unicem for group 1 and 2, and by Panavia F for group 3. After 48 hours of water storage, shear bond strengths were measured. The data was analyzed with one-way analysis of variance and multiple comparison test (Tukey method). RESULTS: The shear bond strengths of Unicem applied to resin coated dentin surfaces were significantly higher than those of Unicem and Panavia F used to uncoated dentin surfaces (P<.0001). CONCLUSION: Application of a resin coating to the dentin surface significantly improved the shear bonding strength of a self adhesive resin cement in indirect restoration.
Subject(s)
Humans , Adhesives , Composite Resins , Dental Enamel , Dentin , Molar , Resin Cements , Tooth , WaterABSTRACT
This study evaluated the influence of material combinations used in the resin coating technique (RCT) on the marginal adaptation of indirect restorations with gingival margins in enamel (EM) and cement (CM). Eighty third-molars were used. Two cavities were prepared in each tooth. The cavities were distributed into 16 groups. Cavities with EM were filled with the following material combinations: G1: Single-Bond 2 (Sb2), G2: Sb2 + Bond/Scotchbond-Multipurpose (Sb2B), G3: Sb2 + Filtek-Flow Z350 (Sb2Fl), G4: Scotchbond-Multipurpose (SBMP), G5: Clearfil-S3 (CS3), G6: CS3 + Bond/Clearfil-SE Bond (CSE3B), G7: CS3 + Protect Liner F (CS3PL) and G8: Clearfil SE Bond + Protect Liner F (CSEBPL). The same combinations were applied to the cavities in CM: G9, G10, G11, G12, G13, G14, G15, G16, respectively. The fillings were performed with the Sinfony-System (3M/ESPE). After 24 h, the teeth were submitted to thermocycling (2,000 cycles, 5° to 55°C) and load-cycling (50,000 cycles, 50 N). Next, the Caries-Detector (Kuraray) was applied to the restoration margins. Images from the proximal margin were evaluated using the Image-Tool 3.0 software. The results were submitted to ANOVA and Tukey's test (α=0.05). The mean values (%) for the groups were: EM: G1=46.68, G2=15.53, G3=19.83, G4=27.53; G5=59.49, G6=25.13, G7=34.37, G8=15.20; CM: G9=38.38, G10=23.25, G11=26.97, G12=25.85, G13=37.81, G14=30.62, G15=29.17, G16=20.31. The highest percentages of marginal gap on EM or CM were found in the groups that did not use a liner. It can be concluded that the most appropriate RCT combinations were the groups that used a liner.
Este estudo avaliou a influência de diferentes combinações de materiais usados na técnica de selamento dentinário (TSD) sobre a adaptação marginal de restaurações indiretas, cujas margens gengivais localizam-se em esmalte (ME) ou cemento (MC). Oitenta terceiros molares foram selecionados e duas cavidades foram preparadas em cada dente, as quais foram distribuídas em 16 grupos. As cavidades com margem em esmalte foram forradas pelas seguintes combinações de materiais: G1: Single-Bond2 (Sb2), G2: Sb2 + Bond/Scotchbond-Multipurpose (Sb2B), G3: Sb2 + Filtek-Flow Z350 (Sb2Fl), G4: Scotchbond-Multipurpose (SBMP), G5: Clearfil-S3 (CS3), G6: CS3 + Bond/Clearfil-SE Bond (CSE3B), G7: CS3 + Protect Liner F (CS3PL), G8: Clearfil SE Bond + Protect Liner F (CSEBPL). As mesmas combinações foram aplicadas às cavidades com margens em cemento: G9, G10, G11, G12, G13, G14, G15, G16, respectivamente. As restaurações foram confeccionadas usando o sistema Sinfony (3M/ESPE). Após 24 h, os dentes restaurados foram submetidos à ciclagem térmica (2.000 ciclos - 5° a 55° C) e mecânica (50.000 ciclos, 50 N). Em seguida, Carie-Detector (Kuraray) foi aplicado sobre as margens das restaurações. As imagens obtidas da margem proximal foram avaliadas pelo software Image-Tool 3.0. Os resultados foram submetidos aos testes estatísticos ANOVA e Tukey (p<0,05). As médias (%) observadas para os grupos foram: ME: G1=46,68, G2=15,53, G3=19,83, G4=27,53; G5=59,49, G6=25,13, G7=34,37 e G8=15,20; MC: G9=38,38, G10=23,25, G11=26,97, G12=25,85, G13=37,81, G14=30,62, G15=29,17, G16=20,31. Os maiores valores de desadaptação marginal encontrados em ME e MC foram encontrados nos grupos que não utilizaram um "liner". Desta forma, pôde-se concluir que a combinação mais apropriada para a TSD é aquela que faz uso do "liner".
Subject(s)
Humans , Composite Resins/chemistry , Dental Marginal Adaptation , Dental Cavity Lining/methods , Dental Materials/chemistry , Dental Restoration, Permanent/classification , Acid Etching, Dental/methods , Bisphenol A-Glycidyl Methacrylate/chemistry , Dental Cavity Preparation/classification , Dental Cements/chemistry , Dental Cementum/ultrastructure , Dental Enamel/ultrastructure , Dentin-Bonding Agents/chemistry , Fluorescent Dyes , Materials Testing , Polyethylene Glycols/chemistry , Polymethacrylic Acids/chemistry , Resin Cements/chemistry , Rhodamines , Stress, Mechanical , Surface Properties , Silanes/chemistry , Temperature , Time FactorsABSTRACT
The aim of this study was to evaluate microtensile bond strength (μ-TBS) and failure mode of indirect composite restorations bonded to dentin using different combinations of Resin-Coating (RC) after thermal and load cycling. Thirty five extracted third molars were used in the study. Two box-like Class II cavities were prepared in each tooth (mesial and distal surface). The 70 cavities were distributed in 7 groups according to the coating materials: G1:Etch-rinse 2steps (SB2); G2:Etch-rinse 2steps/Hydrophobic-monomer (SB2/B); G3:Etch-rinse 2steps/Flowable composite resin (SB2/FL); G4:Self-etch 1step (CS3); G5:Self-etch 1step/Hydrophobic monomer (CS3/B); G6:Self-etch1step/Flowable composite resin liner (CS3/PL), G7:Self-etch 2step/Flowable composite resin liner (CSEB/PL). The cavities were molded with a vinyl polysiloxane impression material and the molds were poured with a stone plaster. The fillings were confectioned using the Sinfony composite system (3M/ESPE) and were cemented with resin luting cement (Rely X ARC system). After 24 hours, the teeth were submitted to thermocycling (2,000C/5-55°C) and load cycling (250,000C/30N). After, the restored teeth were sectioned in to beams and μ-TBS were measured. The data were analyzed with ANOVA and Tukey test (p<0.05). In addition failure mode pattern was determined by scanning electrical microscopy. Bond strength were significantly higher in the groups CSEB/PL and CS3/B (p<0.05). In the groups in which was not used a liner, the failure mode exhibited dentin exposure. The groups CSEB/PL and CS3/B showed the highest values of bond strength and the failure mode reveal CSEB/PL exhibited better performance since doesnt present any fracture kind A.
O objetivo deste estudo foi avaliar a resistência da união, por microtração (μ-TBS), e o modo de fratura de restaurações indiretas de resina aderidas à dentina por diferentes combinações na técnica de Resin-Coating (RC), após ciclagem térmica e mecânica. Neste trabalho foram utilizados trinta e cinco terceiros molares extraídos. Em cada dente foram preparadas duas caixas Classe II (nas faces mesial e distal). As 70 cavidades foram divididas em 7 grupos, de acordo com os materiais de cobertura: G1: adesivo convencional de 2 passos (SB2); G2: adesivo convencional de 2 passos/monômero hidrófobo (SB2/B); G3: adesivo convencional de 2 passos /resina composta flow (SB2/FL); G4:adesivo auto-condicionante de 1 passo (CS3); G5: adesivo auto-condicionante de 1 passo/monômero hidrófobo (CS3/B); G6: adesivo auto-condicionante de 1 passo/resina composta flow forradora (CS3/PL), G7: adesivo auto-condicionante de 2 passos/resina composta flow forradora (CSEB/PL). As cavidades foram moldadas por materiais à base de polivinilsiloxano e os modelos foram obtidos em gesso pedra especial. As restaurações foram confeccionadas usando o sistema Sinfony de compósitos (3M/ESPE); e foram cimentadas com cimento resinoso (Rely X ARC system). Após 24 h, os dentes foram submetidos a ciclagem térmica (2.000C/ 5-55oC) e mecânica (250.000/30N). Foram então seccionadas em palitos para medidas de μ-TBS. Os dados foram analisados por ANOVA e teste Tukey (p<0,05). Além disso, os padrões de fratura foram determinados por meio de microscopia eletrônica de varredura. A resistência da união foi significativamente mais alta nos grupos CSEB/PL e CS3/B (p<0.05). Nos grupos onde não foi usado um agente forrador, os padrões de fratura exibiram exposição de dentina. Os grupos CSEB/PL and CS3/Bos maiores valores de resistência de união e o modo de fratura revelou que CSEB/PL exibiu melhor performance, considerando o fato de não apresentarem nenhuma fratura Tipo A.
Subject(s)
Dental Leakage , Dentin-Bonding Agents , InlaysABSTRACT
A técnica resin-coating consiste na aplicação de sistema adesivo eresina de baixa viscosidade flow imediatamente após o preparo cavitário, produzindouma camada híbrida protegendo dentina e tecido pulpar subjacente. O objetivodesta pesquisa foi avaliar a resistência de união ao cisalhamento e à traçãoquando uma restauração foi fixada com cimento resinoso de cura dual à dentinacom resin-coating. Foram comparados os sistemas adesivos autocondicionantes depasso único (ED Primer) e dois passos (Clearfil Protect Bond) e a técnica de limpezado cimento temporário na resistência adesiva. Foram confeccionadas 160amostras. Os grupos foram divididos, para cada sistema adesivo e para cada tipode teste, da seguinte forma: Grupo 1 ? non-resin-coating, sem cimentação temporária;Grupo 2 ? resin-coating, sem cimentação temporária; Grupo 3 ? resin-coating,cimentação temporária, remoção do cimento com colher de dentina e bolinhade algodão embebida em etanol; Grupo 4 ? resin-coating, cimentação temporária,remoção do cimento com jato de bicarbonato e bolinha de algodão embebidaem etanol. A análise estatística utilizou o teste não-paramétrico de Mann-Whitney.Nos resultados obtidos, não houve significância estatística entre o gruponon-resin-coating e o resin-coating submetidos ao teste de cisalhamento, ao contráriodo teste de tração em que o resin-coating aumentou a adesão. O sistema adesivode dois passos mostrou-se mais eficiente que o de passo único. Observou-se,também, que não houve diferença entre as técnicas de limpeza
The resin coating techniqueconsists in adhesive system and flow resincomposite application immediately after cavitypreparation, yielding a hybrid layer and protectingthe subjacent pulpal complex. The aim ofthis study was to evaluate the tensile and shearbond strength of ceramic crowns cemented withresinous cement after the resin coating technique.Two self etching adhesive systems (ED Primer,one step and (Clearfil Protect Bond, two steps)were compared as also different temporary cementremoving techniques. One hundred and sixty specimenswere divided in groups as followed: G1)non-resin coating/no temporary cementation,G2) resin coating/no temporary cementation,G3) resin coating/temporary cement removedwith dentin spoon/ethanol soaked cotton pellet,G4) resin coating/temporary cement removedwith bicarbonate air abrasion/ethanol soakedcotton pellet. Data were submitted to non-parametricalstatistical test (Mann-Whitney). Therewere no different statistical significance betweenthe resin coating and the non-resin coating groupswhen submitted to the shear test. The resin coatinggroups showed higher tensile bond strengththan the others groups. The two steps self etchingadhesive system seemed to improve the bondstrength results. There were no differences amongthe temporary cement removing techniques used
Subject(s)
Humans , Male , Female , Resin Cements , Dentin , Shear StrengthABSTRACT
The purpose of this research was to compare the microtensile bond strength of resin coated surface and resin inlay according temporary filling materials prior to applying self-adhesive resin cement. Caviton(GC, Japan), Provifil(Promedica, Neumunster, Germany), Provifil(Promedica, Neumunster, Germany) & petrolatum, and Eugenol-based cement, Tembond(Kerr, Orange CA, USA) were used as temporary filling materials. After fabrication of Tescera(Bisco, Schamburg IL, USA), it was bonded with a self-adhesive resin cement, Rely X unicem(3M, St. Paul. Minn, USA). After this procedure, the microtensile bond strength was measured and it was analyzed through one-way ANOVA and Duncan test(p<0.05). Caviton(GC, Tokyo, Japan) showed statistical difference except for the control(group I) and the saliva(group II)(p<0.05). Provifil(group IV), Provifil & petroneum(group V), Tembond(group VI) had lower microtensile bond strength.
Subject(s)
Analysis of Variance , Calcium Sulfate , Citrus sinensis , Dental Cements , Dentin , Inlays , Petrolatum , Resin Cements , Root Canal Filling Materials , Tokyo , Vinyl Compounds , Zinc OxideABSTRACT
To develop an insulated acupuncture needle with low resistance that causes little pain, insulated needles for acupuncture were prepared by electrodeposition of acrylic coatings such as acrylic/fluorine, acrylic/melamine, acrylic/urethane, and acrylic/epoxy resins. Wettability of these needles and resistance to insertion into muscle model (PVA Hydro-gel, Oil dispersed hydro-gel, and Pig muscle) and human tissue were investigated. Wettability of these coating films was estimated from contact angles of water droplets on the film coating. Resistance to insertion of these needles into Hydro-gel gradually increased with increases in their contact angles. Oil dispersed hydro-gel and Pig muscle showed inverse results. When these needles were inserted into human tissue, the acrylic/fluorine coated needle showed the least resistance and patients felt almost no pain.