Influence of Curing Mode and Time on Degree of Conversion of One Conventional and Two Self-adhesive Resin Cements

Aguiar, Thaiane Rodrigues; Francescantonio, Marina Di; Arrais, César Augusto Galvão; Ambrosano, Gláucia María Bovi; Davanzo, Celso U.; Giannini, Marcelo

doi:10.2341/09-252-l

Cited by 58 publications

(60 citation statements)

References 18 publications

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“…34 The lower degree of conversion of self-curing mode can increase the resin matrix permeability for fluoride release, which may explain the increase of fluoride from the self-cured samples. 21 In both phases of this study (first phase, cumulative fluoride release rate in water; second phase, fluoride release profile during pH cycling), the BisCem cement released a higher fluoride concentration in self-curing mode.…”

Section: Discussionmentioning

confidence: 99%

Influence of the Curing Mode on Fluoride Ion Release of Self-adhesive Resin Luting Cements in Water or During pH-Cycling Regimen

Aguiar¹,

Pinto²,

Cavalli³

et al. 2012

Operative Dentistry

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TR Aguiar CF Pinto V Cavalli M Nobre-dos-Santos GMB Ambrosano P Mathias M Giannini Clinical RelevanceWithin the limited experimental conditions, the self-adhesive cements provided fluoride ion release capacity. The fluoride release for all resin cements was not uniform during pH cycling, decreasing throughout the duration of the study. SUMMARYThis study evaluated the effects of curing modes and storage conditions on fluoride release of resin cements. In phase 1, the cumulative fluoride release rate from samples of the resin cements (Panavia F 2.0, RelyX Unicem, MaxCem, and BisCem) was quantified after 15 days storage in water (n=4). In phase 2, the fluoride release profiles from the same materials were analyzed during pH cycling (n=4). In this second phase, fluoride was measured at specific times (one, two, three, five, eight, and 15 days). Disk-shaped specimens were prepared (10 mm 3 0.5 mm), and the materials were either light activated or allowed to autopolymerize. For both phases, the fluoride release was measured using a fluoride ion-specific electrode. The fluoride release in water was not affected by the curing mode of RelyX Unicem and Maxcem resin cements. Panavia F. 2.0 and BisCem resin cements, either light cured or autopolymerized modes, released higher amounts of fluoride in water than the other self-adhesive cements. In phase 2, the concentration of fluoride released decreased from the first day of pH cycling until the 15th day for all resin cements, for both curing modes, regardless of the storage solution used (demineralizing/remineralizing). The fluoride release rate during pH cycling by Panavia F 2.0 and MaxCem was not affected by the curing mode. The effect of the curing mode on fluoride ion release in water or during pH cycling was product dependent.

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Section: Discussionmentioning

confidence: 99%

Influence of the Curing Mode on Fluoride Ion Release of Self-adhesive Resin Luting Cements in Water or During pH-Cycling Regimen

Aguiar¹,

Pinto²,

Cavalli³

et al. 2012

Operative Dentistry

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“…6,10,27 This curing mode was also more influenced by temperature ranges than light-activated modes. More specifically, the DC of MX in self-curing mode increased approximately 14.2% from 258C to 288C, while the light-activated groups showed an approximately 7.1% to 8.1% increase within the same temperature range.…”

Section: Discussionmentioning

confidence: 99%

“…Seven replications were made for each test condition (n=7) based on previous studies using the same methodology. 6,[21][22][23] To ensure delivery of consistent levels of irradiance during testing, the output of the light was continuously checked during testing, using a handheld dental curing radiometer (Cure Rite, Dentsply Caulk, USA). The distal end of the light-emitting guide was placed directly against a 1-mm-thick glass slide, positioned directly over top of the Mylar-covered resin specimen.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…[3][4][5] Because these products use similar mechanisms to initiate polymerization compared with conventional resin cements, their polymerization mode is crucial to ensure an optimal degree of conversion. 6 In this regard, the self-curing mode of such products is generally less effective than the light-activated mode, 6 and little information is available in the literature regarding the effects of light attenuation due to the presence of an indirect restoration interposed between the light-curing unit tip and the SARC layer. 7 This issue raises some concern, however, because the presence of a 1.5-mmthick indirect restoration can cause a severe reduction of 80% to 90% in light intensity.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 Most comparisons between curing conditions and monomer conversion of SARCs are based on in vitro tests performed at room temperature (approximately 258C). 6,[10][11][12] Conversely, SARCs are applied directly to a prepared tooth, where temperature ranges from 27.88C to 32.08C, depending on the tooth, [13][14][15] and not at 378C, as many people assume. For instance, if SARCs are used to cement indirect restorations in anterior teeth, these products will be in contact with tooth surfaces at approximately 28.08C, while the tooth surfaces of premolars and molars will warm SARCs to approximately 328C.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Simulated Tooth Temperature on the Degree of Conversion of Self-adhesive Resin Cements Exposed to Different Curing Conditions

Arrais

Chagas

Munhoz

et al. 2014

Operative Dentistry

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Self-adhesive resin cements present a higher degree of conversion and faster polymerization kinetics when exposed to tooth temperature rather than to room temperature. Clinicians may expect differences in product setting time and some physical properties compared with what manufacturers report. SUMMARYObjectives: This study evaluated the degree of conversion (DC) of two commercial, self-adhesive resin cements (SARCs) using Fourier transform infrared analysis (FTIR) polymerized at simulated prepared tooth surface temperatures and under different curing conditions. Materials and Methods: RelyX U100 (U100, 3M ESPE) and Maxcem Elite (MX, Kerr Corporation) were mixed at 258C and applied to the surface of a horizontal attenuated total reflectance (ATR) unit, which was near room temperature (RT, control) (258C) or heated to simulate prepared tooth surface temperatures (288C and 328C) and then attached to an infrared spectrometer. The products were polymerized using one of three conditions: direct light exposure through a glass slide (DLE), exposure through a 1.5-mm thick ceramic disc overlay , 2014, 39-2, 204-212 (CO) (A2 shade, IPS e.max, Ivoclar Vivadent), or self-curing (SC). FTIR spectra were recorded for 12 minutes (1 spectrum/s, 16 scans/ spectrum, resolution 4 cm À1 ) immediately after application to the ATR. The DC was calculated using standard techniques of observing changes in aliphatic-to-aromatic peak ratios before and 12 minutes after curing, as well as during each 1-second interval. DC data (n=7) were analyzed by two-way analysis of variance and Tukey's post-hoc test (p=0.05).Results: Both simulated tooth temperatures significantly increased DC in all groups of MX and in the CO and SC groups of U100 compared with the RT control. For MX, the self-cure groups exposed to tooth temperatures showed DC values similar to those of the CO groups. For U100, the CO groups showed higher DC values than SC groups regardless of temperature. Time-based conversion profiles ranged according to product, temperature, and curing mode.Conclusions: Causing SARCs to polymerize at simulated tooth temperatures increases DC of SARCs compared with room-temperature curing values, mainly in the SC mode.

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Inorganic composition and filler particles morphology of conventional and self‐adhesive resin cements by SEM/EDX

Aguiar

Francescantonio

Bedran-Russo

et al. 2012

Microscopy Res & Technique

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The purpose of this study was to characterize the inorganic components and morphology of filler particles of conventional and self-adhesive, dual-curing, resin luting cements. The main components were identified by energy dispersive X-ray spectroscopy microanalysis (EDX), and filler particles were morphologically analyzed by scanning electron microscopy (SEM). Four resin cements were used in this study: two conventional resin cements (RelyX ARC/3M ESPE and Clearfil Esthetic Cement/Kuraray Medical) and two self-adhesive resin cements (RelyX Unicem/3M ESPE and Clearfil SA Luting/Kuraray Medical). The materials (n = 5) were manipulated according to manufacturers' instructions, immersed in organic solvents to eliminate the organic phase and observed under SEM/EDX. Although EDX measurements showed high amount of silicon for all cements, differences in elemental composition of materials tested were identified. RelyX ARC showed spherical and irregular particles, whereas other cements presented only irregular filler shape. In general, self-adhesive cements contained higher filler size than conventional resin luting cements. The differences in inorganic components and filler particles were observed between categories of luting material and among them. All resin cements contain silicon, however, other components varied among them.

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Influence of Curing Mode and Time on Degree of Conversion of One Conventional and Two Self-adhesive Resin Cements

Cited by 58 publications

References 18 publications

Influence of the Curing Mode on Fluoride Ion Release of Self-adhesive Resin Luting Cements in Water or During pH-Cycling Regimen

Influence of the Curing Mode on Fluoride Ion Release of Self-adhesive Resin Luting Cements in Water or During pH-Cycling Regimen

Effect of Simulated Tooth Temperature on the Degree of Conversion of Self-adhesive Resin Cements Exposed to Different Curing Conditions

Inorganic composition and filler particles morphology of conventional and self‐adhesive resin cements by SEM/EDX

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