Step-cure polymerization: Effect of initial light intensity on resin/dentin bond strength in class I cavities

dc.creatorSantos, AJS
dc.creatorSarmento, CF
dc.creatorAbuabara, A
dc.creatorAguiar, FHB
dc.creatorLovadino, JR
dc.date2006
dc.dateMAY-JUN
dc.date2014-11-19T04:33:59Z
dc.date2015-11-26T17:57:25Z
dc.date2014-11-19T04:33:59Z
dc.date2015-11-26T17:57:25Z
dc.date.accessioned2018-03-29T00:40:58Z
dc.date.available2018-03-29T00:40:58Z
dc.identifierOperative Dentistry. Operative Dentistry Inc, v. 31, n. 3, n. 324, n. 331, 2006.
dc.identifier0361-7734
dc.identifierWOS:000238207400007
dc.identifier10.2341/05-37
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/75192
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/75192
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/75192
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1291478
dc.descriptionThis in vitro study assessed the effect of a step-cure light curing method on resin/dentin bond strength on the buccal wall of Class I cavities in human teeth. Occlusal enamel was removed to expose a flat dentin surface. Twenty four box-shaped cavities (C-factor = 4.5) were prepared in dentin. Prime&Bond 2.1 was applied and TPH Spectrum (Dentsply) was inserted using a bulk-filling increment. The composite was light-cured using either a step-cure photoactivation technique or a one-step continuous curing method. For step-cure polymerization, the initial cure intensity was varied by changing the distance between the light source and the resin surface. The light-cured resins were cured using four low light intensities: 150(G1), 200(G2), 250(G3) and 300(G4) mW/cm(2). In the continuous exposure curing method, the samples were light-activated for 40 seconds at 740 mW/cm2 and irradiation was applied in a box-shaped cavity and a flat cavity (exposed buccal wall, C-factor = 0.22). Samples were prepared for TBS testing by creating bonded beams (of approximately 0.8 mm(2)) obtained from the buccal wall. The data were analyzed using one-way ANOVA, Tukey Test and Dunnett's Test at a significance level of 0.05. The mean TBS values for the continuous exposure group in the flat and box-shaped cavities were 24.31 and 10.23 MPa, respectively. The corresponding TBS for step-cure polymerization was 23.13 (G3), 18.83 (G2), 14.87 (G1) and 13.26 MPa (G4). Bond strength values to the cavity wall were lower in the three-dimensional cavities and dependent on the light curing method (p<0.05). The use of a low initial light intensity (200-250 mW/cm(2)) for 10 seconds followed by high irradiation intensity provided the best bond strengths, similar to bonding in a flat cavity.
dc.description31
dc.description3
dc.description324
dc.description331
dc.languageen
dc.publisherOperative Dentistry Inc
dc.publisherIndianapolis
dc.publisherÍndia
dc.relationOperative Dentistry
dc.relationOper. Dent.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectResin Composite Restorations
dc.subjectContraction Stress
dc.subjectMarginal Adaptation
dc.subjectDental Composites
dc.subjectWall Adaptation
dc.subjectShrinkage
dc.subjectConfiguration
dc.subjectMicroleakage
dc.subjectIrradiation
dc.subjectActivation
dc.titleStep-cure polymerization: Effect of initial light intensity on resin/dentin bond strength in class I cavities
dc.typeArtículos de revistas


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