Composite pre-heating: Effects on marginal adaptation, degree of conversion and mechanical properties

Fróes-Salgado, N. R. G.; Silva, Luciana Maria; Kawano, Yoshio; Francci, Carlos Eduardo; Reis, Alessandra; Loguércio, Alessandro Dourado

doi:10.1016/j.dental.2010.03.023

Cited by 155 publications

(187 citation statements)

References 20 publications

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“…temperature is expected even if the RC is coupled to a heated indirect restoration. Because of such a drop in resin temperature, Froes-Salgado et al 25 found no significant differences in DC, flexural strength, and cross-linking estimated values between pre-heated composites and composites polymerized at room temperature. For this reason, further studies simulating this clinical condition are required to evaluate the effects of temperature drop on the mechanical properties and DC of RCs.…”

Section: Discussionmentioning

confidence: 97%

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Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

2011

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This study evaluated the degree of conversion (DC) and ultimate tensile strength (UTS) of dual-cured resin cements heated to 50º C prior to and during polymerization. Disc-and hourglass-shaped specimens of Rely X ARC (RX) and Variolink II (VII) were obtained using addition silicon molds. The products were manipulated at 25º C or 50º C and were subjected to 3 curing conditions: light-activation through a glass slide or through a pre-cured 2-mm thick resin composite disc, or they were allowed to self-cure (SC). All specimens were dark-stored dry for 15 days. For DC analysis, the resin cements were placed into the mold located on the center of a horizontal diamond on the attenuated total reflectance element in the optical bench of a Fourier Transformed Infrared spectrometer. Infrared spectra (n = 6) were collected between 1680 and 1500 cm -1 , and DC was calculated by standard methods using changes in ratios of aliphatic-to-aromatic C=C absorption peaks from uncured and cured states. For UTS test, specimens (n = 10) were tested in tension in a universal testing machine (crosshead speed of 1 mm/min) until failure. DC and UTS data were submitted to 2-way ANOVA, followed by Tukey's test (α= 5%). Both products showed higher DC at 50º C than at 25º C in all curing conditions. No significant difference in UTS was noted between most light-activated groups at 25º C and those at 50º C. VII SC groups showed higher UTS at 50º C than at 25º C (p < 0.05). Increased temperature led to higher DC, but its effects on resin cement UTS depended on the curing condition.

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Section: Discussionmentioning

confidence: 97%

“…This methodology may differ from a clinical situation where a drastic drop in temperature of the heated resin composites is observed when they are placed in tooth cavities. 24,25 For this reason, a decrease in the cement characteristics of dual-cured resin cement systems. J Dent.…”

Section: Discussionmentioning

confidence: 99%

Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

2011

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“…One study 15 showed that prewarming of composite resin might have a detrimental effect on restoration margins as it increases polymerization shrinkage. Conversely, the results of a recent study by Fróes-Salgado and others 16 showed that prewarming of composite resins before light activation in clinical situations does not alter their mechanical properties and monomer conversion but enhances composite resin adaptation to cavity walls. A more recent study by Deb and others 17 revealed that prewarming of dental composite resins enhances their flowability and conversion degree.…”

Section: Introductionmentioning

confidence: 91%

Effect of Prewarming and/or Delayed Light Activation on Resin-Modified Glass Ionomer Bond Strength to Tooth Structures

Khoroushi¹,

Karvandi²,

Sadeghi³

2012

Operative Dentistry

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“…11 Composite resin preheating to 60°C prior to resin polymerization decreases the resin viscosity and allows for an increased free radical mobility. [12][13][14][15] Consequently, these materials achieve higher monomer conversion at high temperature than when they are achieved at room temperature. 12,13,[16][17][18] When monomer conversion is closely related to the polymer mechanical properties, [19][20][21] improved bond strength of indirect restorations to dentin would be expected even when LA polymerization relies solely on selfcuring components.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-heated dual-cured resin cements on the bond strength of indirect restorations to dentin

et al. 2012

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This study evaluated the effects of resin luting agents (LA) polymerized using increased temperature on the in vitro microtensile bond strength (µTBS) of indirect restorations to dentin. The occlusal dentin surfaces of 40 human third molars were exposed and flattened. The teeth were assigned to 8 groups (n = 5) according to the LA temperature (25°C or 50°C), curing mode (dual-or self-curing mode), and product (Excite DSC / Variolink II [VII] and XP Bond / Calibra [Cal]). The bonding agents were applied to the dentin surfaces according to manufacturers' instructions. For preheated groups, the LAs were heated to 50°C, subsequently mixed on a heated stirrer surface, and applied to the previously heated pre-polymerized resin discs (2 mm thickness, TPH-Spectrum). The discs were bonded to the dentin surfaces, and the LAs were either exposed to a curing light according to manufacturers' instructions or allowed to self-cure. Specimens were stored in relative humidity at 37°C for 7 days. Specimens were mesio-distally and bucco-lingually sectioned to obtain multiple bonded beams with a 1-mm 2 cross-sectional area for µTBS testing. Data (MPa) were analyzed by 2-way ANOVA and Tukey's post hoc test (α = 5%) for each product. Specimen failure patterns were analyzed using a scanning electron microscope. VII groups showed higher µTBS at 50°C than at 25°C regardless of curing mode (p = 0.05). Cal groups showed similar µTBS at 25°C and 50°C in all activation modes. The use of some dual-polymerizing LAs at 50°C may improve the µTBS of indirect restorations to dentin.

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Composite pre-heating: Effects on marginal adaptation, degree of conversion and mechanical properties

Cited by 155 publications

References 20 publications

Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength

Effect of Prewarming and/or Delayed Light Activation on Resin-Modified Glass Ionomer Bond Strength to Tooth Structures

Effect of pre-heated dual-cured resin cements on the bond strength of indirect restorations to dentin

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