2003
DOI: 10.1590/s1517-74912003000400008
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Effect of the number of thermocycles on microleakage of resin composite restorations

Abstract: Thermocycling simulates, in vitro, thermal changes that occur in the oral cavity. The aim of this study was to evaluate the influence of the number of cycles on microleakage. Class V cavities (1.5 mm deep, 3 mm in height and 3 mm in width) were prepared in bovine teeth, restored with a Single Bond/Z250 restorative system (3M/ESPE) and then divided into five groups of ten teeth each: group 1 was not thermocycled (control group), and groups 2, 3, 4 and 5 were thermocycled 500, 1,000, 2,500 and 5,000 times, respe… Show more

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Cited by 42 publications
(30 citation statements)
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“…This situation can lead to problems with microorganisms, discoloration and the separation of the components of the appliance. Knowing the shrinkage of methacrylate resins, it seems appropriate to use thermocycling to reflect the clinical situation before samples are subjected to dye [19]. Out of 60 measurements done from the vestibular and lingual sides, only one instance of dye penetration to the adhesive connection was observed.…”
Section: Discussion Dye Penetrant Inspectionmentioning
confidence: 99%
“…This situation can lead to problems with microorganisms, discoloration and the separation of the components of the appliance. Knowing the shrinkage of methacrylate resins, it seems appropriate to use thermocycling to reflect the clinical situation before samples are subjected to dye [19]. Out of 60 measurements done from the vestibular and lingual sides, only one instance of dye penetration to the adhesive connection was observed.…”
Section: Discussion Dye Penetrant Inspectionmentioning
confidence: 99%
“…Acrescenta-se que nenhum outro tipo de estresse quer seja mecânico ou químico, foi introduzido como variável, no sentido de se evitar a introdução de um viés de confundimento quando da análise dos resultados devido ao tamanho do universo amostral do presente estudo. Além disso, o estresse térmico não assegura a reprodutibilidade das condições in vivo e freqüentemente superestima a microinfiltração 23 . Vale ressaltar, entretanto que no meio ambiente bucal, estas variáveis não só estão presentes, mas também vão influenciar o desempenho clinico e a longevidade destas restaurações.…”
Section: Qualidade Adesiva Preparo Cavitário Classe I Microinfiltraçãounclassified
“…The number of thermal cycles (1000, 2000 and 3000) was defined according to those commonly used in the literature, simulating aging for less than a year [16][17][18] , whereby 10,000 (ten thousand) cycles corresponded to one year of aging 19 . A thermocycling equipment was used (Elquip, São Carlos, Brazil) set at 15-second dips to 5 seconds of transfer time.…”
Section: Introductionmentioning
confidence: 99%