Clinically Relevant Issues Related to Preheating Composites

Daronch, Márcia; Rueggeberg, Frederick A.; Moss, Linda; Góes, Mário Fernando de

doi:10.1111/j.1708-8240.2006.00046.x

Cited by 122 publications

(163 citation statements)

References 13 publications

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“…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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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: 99%

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

2011

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“…[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. Although concerns about the possible effects of temperature on pulp may arise, previous findings have demonstrated that any increase in composite resin temperature to 54°C and 60°C does not significantly change the intrapulpal temperatures.…”

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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“…In this process, the preheated resins cool, and accordingly their properties will change. Studies show that the surface temperature of resins will decrease by 35%-40% 40 seconds after their being preheated to 60 7) . It is worth giving attention to whether pre-heating has a negative effect on the degree of conversion and the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Preheating on Light Cured Resin Composites

Zhao

Qian

Hong

et al. 2012

J. Hard Tissue Biology.

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This paper is intended to offer a theoretical basis for clinical appliance of preheating by comparing the properties of six different resin composites at room temperature and pre-heated temperature. The experiment is divided into two groups: one at room temperature (20 , the other at preheated temperature (60 ). At room temperature, the six resin composites were exposed to a LED light for 20 seconds. While in the other group, the resins were firstly put into an incubator which is elevated to 60 , and then taken out. After 60 seconds, they were exposed to LED light for 20 seconds. In each group, the compressive strength, micro Vickers hardness and the degree of conversion of six resin composites were tested. After being filled with resin composites, the extracted teeth were dyed and sliced. The microleakage of the restoration was observed and then recorded. All the data was analyzed by statistical analyses. Preheating has no apparent effect on compressive strength, hardness and degree of conversion of Filtek TM Z350, Surefil, Solitaire2, ESTELITE , BRILLIANT New Line, but significantly improved the compressive strength and the hardness of GRADIA DIRECT. And preheating also reduces the microleakage of resins, especially for Surefil and Solitaire2. Preheating has effect on the properties of resin composites, and different resins differ in the sensitivity to preheating due to their different components and contents. In clinical, we ought to fully consider the value of preheating according to requirement in order to obtain the benefit.

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Clinically Relevant Issues Related to Preheating Composites

Cited by 122 publications

References 13 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 pre-heated dual-cured resin cements on the bond strength of indirect restorations to dentin

The Effect of Preheating on Light Cured Resin Composites

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