The effect of LED curing mode on microleakage of Class V cavity restored by silorane-based composite

Shafıei, Fereshteh; Akbarian, Sahar

doi:10.3109/00016357.2012.757357

Cited by 1 publication

(3 citation statements)

References 34 publications

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“…Aiming to reduce the polymerization shrinkage, researches have focused on the use of siloranebased monomers [9,11,[18][19][20][21][22][23]. These resins have demonstrated some desirable properties such as lower polymerization shrinkage than conventional methacrylate-based composite resins [15].…”

Section: Introductionmentioning

confidence: 99%

“…In general, the polymerization process through the opening of cationic rings results in a reduced polymerization shrinkage this is given by activation of the acid cation which opens the ring of the oxirane molecule leaving the other cation free to react. The difference between the silorane-and methacrylate-based resins is that the silorane polymerization is given by means of cations, while the polymerization of methacrylates is given by free radicals approaching [18,23].…”

Section: Introductionmentioning

confidence: 99%

“…Because silorane-based composite is a material with low polymerization shrinkage smaller than 1%, larger increments are recommended for restorations in posterior teeth. However, the studies on the properties as the marginal adaptation [6,22], sorption and solubility [5], degree of conversion [19] and microleakage [23] indicate that the thickness of these increments may compromise the curing depth.…”

Section: Introductionmentioning

confidence: 99%

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Curing depth of a silorane-based resin composite

Cardia¹,

Ishikiriama²,

Borges³

et al. 2016

RSBO

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The silorane-based resin appears aiming to minimize the effects of polymerization shrinkage, but other properties must be studied. Objective: To evaluate the polymerization depth of two composites with different organic matrix. Material and methods:80 cylindrical specimens were prepared using a metallic matrix, with three layers (top, middle and bottom), 1 mm high and 5 mm in diameter. The specimens were divided into eight groups (n = 10) according to the composite resins: Filtek P90 (3M/ESPE); Filtek Z250 (3M/ESPE), light-cured with a LED device with different irradiance and times (600mW/cm2 x 40s, 1000mW/cm2 x 40s, 1000mW/cm2 x 20s; 1400mW/cm2 x 20s). The irradiance was controlled by placing plastic rings coupled to the device’s tip. Immediately after polymerization, the specimens’ layers were separated and five Knoop microhardness readings (initial hardness) were performed on each one of the four layers (0, 1, 2, and 3 mm). After 7 day storage in water at 37ºC, new readings were performed (final microhardness). The data were analyzed by four-way ANOVA (resin, energy density, depth and time) and Tukey test (α = 0.05). Results: The microhardness decreased with the depth increasing both in the initial and 7 day readings. The hardness increased with the highest power densities. The resin P90 had lower hardness values. Conclusion: The silorane-based resin showed Knoop microhardness values significant smaller than those of methacrylate-based resin in almost all evaluated parameters. However, both presented similar behaviors in relation to the curing depth.

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