Influence of polymerization mode on flexural properties of esthetic resin luting agents

Lü, Huan; Mehmood, Afifa; Chow, Alice; Powers, John M.

doi:10.1016/j.prosdent.2005.09.016

Cited by 57 publications

(78 citation statements)

References 17 publications

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“…However, dual-cured resin luting agents with dual-cured mode could produce higher KHN2 than those without irradiation, except for NX2 irradiated through 3 mm thick ceramic. Even under low light intensity irradiation, 13 dual-cured resin still has a large amount of free radicals, mostly from chemical catalysts trapped in the hardening resin matrix. Although these trapped free radicals did not contribute significantly to overall DC, they could improve the cross-linking density of dual-cured resin luting agents through combining with a double link of methacrylated groups in local resin matrix to finish termination.…”

Section: Discussionmentioning

confidence: 99%

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Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

2008

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Section: Discussionmentioning

confidence: 99%

“…Apart from thickness of restorations, the three curing modes (dual, light, and chemical) used for dual-cured resin luting agents may affect the mechanical properties [10][11][12][13]. It was believed that different brands of dual-cured resin luting 5 agent had different ratios of light/chemical catalysts.…”

Section: Introductionmentioning

confidence: 99%

Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

2008

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“…An important aspect to be considered is the monomer's degree of conversion which affects the physico-chemical properties including strength, stiffness, water absorption, biocompatibility as well as color stability. Post-operative sensitivity has also been reported as a possible consequence of inadequate polymerization of the resin cement [2][3][4][5][6][7][8][9][10][11][12][13] . The use of dual-curing resin cements intends to combine chemical and light-polymerization and at the same time allowing polymerization to take place in deeper areas of the tooth cavity applying shorter light irradiation time.…”

Section: Introductionmentioning

confidence: 99%

Dual-curing, self-adhesive resin cement: influence of the polymerization modes on the degree of conversion and microhardness

et al. 2010

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RelyXTM Unicem, dual-curing self-adhesive resin cement, was tested in order to evaluate the degree of conversion (DC) and Vickers microhardness (VMH). The specimens were prepared into 4 groups (GR). For GR1, the specimens were irradiated with 500 mW.cm -2 during 20 seconds while for GR3 the same intensity was used but the irradiation time was 40 seconds. The GR2 followed the same polymerization mode of the GR1 but a ceramic disk was applied as a light barrier. For the last group, only the chemical polymerization was carried out. The DC and VMH were measured immediately after the irradiation time and again after 24 hours. Dual-polymerization (light and chemical polymerization) showed higher DC and VMH than the chemical polymerization (dark cure). The presence of a ceramic disk did not affect the DC but reduced the VMH. Increasing the exposure to light, the DC remained almost constant whereas the VMH raised slightly indicating that the VMH is quite dependent on the incident energy. Additionally, the powder/liquid portions of the cement were also characterized. The TG showed that the solid fraction was constituted of 96% of inorganic matter and 4% of vinyl-silane, a coupling agent. Regarding the liquid part, it was found that 84% was related to the mixture of monomers. The SEM revealed that the size particle of the inorganic fillers were between 400 and 11.000 nm. Factors such as energy density, size and distribution of inorganic fillers and the low effectiveness of the chemical cure contributed to the low values of the DC and VMH.

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“…These results are consistent with those of a previous study; 24 however, they differ from those of another study, 23 which did not report changes in microhardness values 24 hours after irradiation. However, the polymerization reaction of the dual-polymerizing materials might be specific, 22 and the resin cements tested in these studies…”

Section: Discussionmentioning

confidence: 99%

“…20,21 The constitution of the core and post, which forms a mechanically homogeneous unit with root dentin, is difficult to determine and could be compromised if the dual-polymerizing resin cement used does not reach an adequate monomer conversion. [22][23][24] When dual-polymerizing resin cements are used to lute the fiber-reinforced post in the prepared root canal, polymerization occurs in a coronal direction. Therefore, their properties may be different at different depths of the post cavity, 25,26 because of the reduction in light irradiation with increasing depth of cavity.…”

Section: Introductionmentioning

confidence: 99%

Microhardness of dual-polymerizing resin cements and foundation composite resins for luting fiber-reinforced posts

Yoshida

Meng²

2014

The Journal of Prosthetic Dentistry

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Statement of problem. The optimal luting material for fiber-reinforced posts, to ensure the longevity of foundation restorations, remains undetermined.Purpose. The purpose of this study was to evaluate the suitability of 3 dual-polymerizing resin cements (DRCs) and 2 dual-polymerizing foundation composite resins (DFCRs) for luting fiber-reinforced posts by assessing their Knoop hardness number (KHN). Results. At both times after irradiation, the 5 resins materials showed the highest KHNs at the 0.5-mm depth. At 7 days after irradiation, the KHNs of the resin materials did not differ significantly between the 8.0-mm and 10.0-mm depths (P>.05). For all materials, the KHNs at 7 days after irradiation were significantly higher than those at 0.5 hour after irradiation at all depths (P<.05). At 7 days after irradiation, the KHNs of the 5 resin materials were found to decrease in the following order: DCP, UCE, PF2, SAC, and GLA (P<.05). Material and methods. Conclusions.The KHN depends on the depth of the cavity, the length of time after irradiation, and the material brand. Although the KHNs of the 2 DFCRs were higher than those of the 3 DRCs, notable differences were seen among the 5 materials at all depths and at both times after irradiation. Clinical ImplicationsWithin the limitations of this in vitro study, dual-polymerizing foundation composite resins may be preferable to dual-polymerizing resin cements for luting fiber-reinforced posts into cavities because of their superior KHNs at all cavity depths.

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Influence of polymerization mode on flexural properties of esthetic resin luting agents

Cited by 57 publications

References 17 publications

Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

Influence of ceramic thickness on mechanical properties and polymer structure of dual-cured resin luting agents

Dual-curing, self-adhesive resin cement: influence of the polymerization modes on the degree of conversion and microhardness

Microhardness of dual-polymerizing resin cements and foundation composite resins for luting fiber-reinforced posts

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