Effect of thermal cycling and filling technique on leakage of composite resin restorations

Kenshima, Sílvia; Singer, Júlio da Motta; Ballester, Rafael Yagüe

doi:10.1590/s1678-77572004000400010

Cited by 5 publications

(6 citation statements)

References 16 publications

(18 reference statements)

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“…Strength, hardness, thermal expansion coefficient, wear resistance, sorption processes and polymerization shrinkage are all dependent on the filling and the coupling agents. 3,4 The use of nanoclays as matrixes in dental resins is based on the exfoliation of clays promoting the clay-polymer interactions at the nanoscale dimensions. 5 Nanofilled dental resins containing from 1 to 100 nm-size particles have been developed in the search for materials with low polymerization shrinkage, and better mechanical, optical and polishing characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

et al. 2016

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Experimental dental resins composed of triethyleneglycol dimethacrylate, urethane dimethacrylate, ethoxylated bisphenol-A-dimethacrylate and bisphenol A glycidyl methacrylate containing an organoclay as filler were prepared by photopolymerization. The addition of organoclay fillers results in slower polymerization rates (0.59 and 0.24 mol L -1 min -1 , for the formulations without and with 15% of organoclay, respectively) and lower degrees of conversion (0.50 and 0.35 for the formulations without and with 15% of organoclay), as determined by photocalorimetry. The influence of the organoclay on the thermal and mechanical properties of the resins was evaluated using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) techniques. The (tan δ) and E´ curves indicate the formation of more rigid materials and the damping curve data indicates more homogeneous materials. An increase of storage modulus, E', was observed for composites with the higher organoclay filler contents. These effects are due to the higher viscosity of the systems with organoclay, resulting in a lower mobility of the radicals during the propagation step of polymerization, as well as to the scattering of the incident photopolymerizing radiation, which lowers the amount of initiation centres.

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Section: Introductionmentioning

confidence: 99%

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

et al. 2016

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“…When applied in a cavity with the adhesive system, it establishes a proper interaction with the enamel and/or dentin, and the longitudinal stability is directly related to the steps resulting from cavity preparation, intrinsic characteristics of the adhesive and restorative materials, operational procedures and manipulative weather of the oral environment (5,10). Another important factor for CR refers to its mechanism of polymerization shrinkage (11). The marginal gap caused by the polymerization shrinkage may lead to pain on biting and failure of adhesion by repeated occlusal loading (6).…”

Section: Resultsmentioning

confidence: 99%

“…The adaptation of the material to the cavity depends essentially on their thermal expansion and dimensional changes during the process of polymerization (2,13,14). Differences in the coefficient of linear thermal expansion between the dental restorative materials and structures are largely responsible for the leakage (2), which justifies the use of thermal cycling in this work (11,15). Theoretically, the greater the difference between the coefficient of thermal expansion of the restorative material and the tooth, the greater the marginal leakage that occurs during temperature changes (15).…”

Section: Resultsmentioning

confidence: 99%

Marginal microleakage of class II composite resin restorations due to restorative techniques

Carvalho¹,

Moreira²,

Cunha³

et al. 2010

Rev. odonto ciênc. (Online)

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Purpose: To evaluate the marginal microleakage of class II composite resin (CR) restorations due to restorative techniques.Methods: Forty human extracted premolars were assigned to 4 groups (n=10). Class II cavities were prepared (4-mm wide, 2-mm axially, with the gingival margin located 1 mm beyond the cementum-enamel-junction), and the restorative adhesive system Prime & Bond 2.1/TPH 3 (Dentsply) was used. CR was inserted by the oblique incremental technique (OIT) and cured in continuous exposure. The restoratives techniques were: group 1 (control): OIT; group 2: flowable resin (1 mm) applied in the gingival wall + OIT; group 3: OIT + three pre-cured spheres inserted in the first increment of CR; and, group 4: OIT + strip of fiberglass inserted in the first increment of CR. The specimens were subjected to a thermocycling regimen of 500 cycles (1 min at 5º-37º-55ºC), coated with two layers of nail varnish up to 1 mm from the restoration margins, and immersed in 0.5% basic fuchsine solution for 24 h. The extension of dye penetration at the cervical wall (µm) was evaluated using an optic microscope at x40. Data were analyzed using analysis of variance (ANOVA) (α=0.05).Results: The microleakage values were: G1: 370 µm ± 241; G2: 398 µm ± 354; G3: 205 µm ± 119; and G4: 413 µm ± 340. No statistically significant differences were found among the restorative techniques (P=0.081). Conclusion:Marginal microleakage values were not influenced by the different restorative techniques tested.

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“…Thus, a proper bond of an adhesive to the dental tissue contributes to avoid marginal microleakage 7,14 . In the present study, the location of the restoration margin influenced the gap formation only for the SB, while this adhesive presented the best marginal adaptation to the enamel margins.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to stress shrinkage, the occlusal loads and alterations of the temperature of the oral behavior produce stress on the restoration and can also compromise the marginal sealing 14,27 . Clinical evaluations of restorations are very complicated because of ethical reasons, and they are time-consuming and expensive.…”

Section: Introductionmentioning

confidence: 99%

Marginal adaptation of class V composite restorations submitted to thermal and mechanical cycling

Casselli

Faria-e-Silva

Casselli³

et al. 2013

J. Appl. Oral Sci.

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Objective:This study evaluated the effect of the margin location and an adhesive system on the marginal adaptation of composite restorations.Material and Methods:Class V cavities were prepared in bovine teeth with the gingival margin on the dentin and the incisal margin on the enamel. The cavities were restored with a micro-hybrid composite resin using an etch-and-rinse [Single Bond 2 (SB)] or a self-etching adhesive [Clearfil SE Bond (CL)]. After finishing and polishing the restorations, epoxy replicas were prepared. The marginal adaptation was analyzed using scanning electronic microscopy (SEM, 500 x magnification). The higher gap width in each margin was recorded (T0). After the first evaluation, the samples were submitted to thermal cycling (2,000 cycles of 5ºC±2ºC followed by 55ºC±2ºC - T1) and mechanical cycling (100,000 cycles of 50 kN and 2 Hz - T2). Replicas of samples were rebuilt after each cycling and analyzed under SEM. The data were submitted to Mann-Whitney, Wilcoxon and Friedman testing (a=0.05).Results:The SB presented higher gaps in the dentin than the enamel, while there was no difference between the substrate for the CL. In the dentin, the CL showed better marginal sealing than the SB. The opposite occurred in the enamel. There were no significant differences between the baseline, thermal and mechanical cycling for any experimental condition.Conclusions:The outcomes of the present study showed that the adhesive system and margin location have an important effect on the marginal adaptation of composite restorations.

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Effect of thermal cycling and filling technique on leakage of composite resin restorations

Cited by 5 publications

References 16 publications

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

Marginal microleakage of class II composite resin restorations due to restorative techniques

Marginal adaptation of class V composite restorations submitted to thermal and mechanical cycling

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