Degree of conversion of three composite materials employed in the adhesive cementation of indirect restorations: A micro-Raman analysis

Acquaviva, Pier Antonio; Cerutti, Federico; Adami, Gianmaria; Gagliani, Massimo; Ferrari, Marco; Gherlone, Enrico; Cerutti, Antonio

doi:10.1016/j.jdent.2009.04.001

Cited by 79 publications

(130 citation statements)

References 41 publications

(41 reference statements)

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“…In this study, the lowest mean bond strength values were achieved in the apical region. This finding could be attributed to the insufficient photo-polymerization of the cements at the apical one third [33]. On the contrary, coronal region demonstrated significantly higher bond strength values when compared with middle and apical one third in both cement groups, which is in agreement with several other studies [34,35].…”

Section: Discussionsupporting

confidence: 91%

Effect of timing for core preparation, luting cement type and root level on adhesion of fiber posts to intraradicular dentin

Sukuroglu

Aktaş

Askın

et al. 2015

Journal of Adhesion Science and Technology

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This study assessed the effect of timing of core preparation and luting cement on adhesion of fiber reinforced composite (FRC) posts on different levels of intraradicular dentin when cemented with either conventional dual-polymerized or self-adhesive resin cement.Single-rooted human teeth (N=80) were endodontically treated and randomly divided into 2 groups (n=40) according to resin cement: a) Conventional dual resin cement (Variolink II, V) or b) Self-adhesive resin cement (RelyX U200, R). They were further divided into two subgroups according to timing of core preparation (n=20): a) immediate (i) or b) delayed (d). FRC posts (Cytec Blanco) were cemented and the roots were sliced into discs at the coronal, middle and apical levels. Push-out tests were then performed in a Universal Testing Machine (1 mm/min).Data (MPa) were analyzed using three-way ANOVA and Tukey`s tests considering the factors "core preparation time", "luting cement" and "root level" (α=0.05). Type of luting cement (p<0.001), time of core preparation (p<0.001) and root level (p<0.001) significantly affected the bond strength results. R cement was more significantly affected by core preparation time (Ri: 2.91±1.1; Rd: 4.83±1.68) compared to V cement (Vi: 2.92±1.63; Vd: 2.65±1.6) (p<0.05). Coronal region demonstrated significantly higher bond strength values than those of middle and apical third in all groups (coronal: 4±1.9; middle: 3.1±1.4; apical: 2.4±1.1) (p<0.05). Adhesive failure between cement and dentin was the most frequent (64%) followed by adhesive failure between cement and post (18%). Delayed core preparation can improve bond strength of FRC posts to intraradicular dentin when cemented with self-adhesive cement compared to conventional dual polymerized resin cement.

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Section: Discussionsupporting

confidence: 91%

Effect of timing for core preparation, luting cement type and root level on adhesion of fiber posts to intraradicular dentin

Sukuroglu

Aktaş

Askın

et al. 2015

Journal of Adhesion Science and Technology

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“…2,36-38 Spinell and others, using an FTIR spectrometer, also reported %DC values ranging from 49.6% to 73.2% of resin cements in self-cure mode and from 67.3% to 85.1% in dual-cure mode. 39 In this sense, the degree of conversion has been shown to be highly material-dependent, 37 as differences in filler size and fraction/percentage, 40 photoinitiation chemistry, 38 resin formulation and organic monomer type 17,41 play a fundamental role in the polymerization process.…”

Section: Discussionmentioning

confidence: 99%

Degree of Conversion of Luting Resins Around Ceramic Inlays in Natural Deep Cavities: A Micro-Raman Spectroscopy Analysis

Lohbauer¹,

Pelka²,

Belli³

et al. 2010

Operative Dentistry

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Clinical RelevanceContrary to previous evidence, the degrees of conversion of resin luting materials have been shown to reach statistically similar values in three different depths around ceramic inlays luted to natural cavities. Both dual-cure and light-cure materials have presented conversion homogeneity, although they have been shown to be material-dependent. SUMMARYThis study evaluated the degree of conversion (%DC) of luting agents around ceramic inlays placed in deep natural cavities. Thirty-six cylindrical Class I cavities (diameter = 4 mm, depth = 4 mm) were prepared in freshly extracted human teeth and randomly divided according to the luting materials used for luting CAD/CAM fabricated inlays (Empress CAD). The dual-cure resin cements Clearfil Esthetic Cement and Variolink II Low and the light-cure composites Grandio Flow and Grandio were luted using the total-etch technique. The self-adhesive dual-cure cements RelyX Unicem and Maxcem Elite were used as recommended by the manufacturer. All of the restorations were photo-activated using a quartz halogen unit (Elipar TriLight; 750 mW/cm²) for 40 seconds. After 24 hour dry-storage in the dark, all the teeth were vertically sectioned into two halves (n=12 per group) using a slow-speed diamond-saw in the bucco-vestibular direction under constant water lubrication to

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“…4 The self-curing component of the resin cement is useful because it favors its degree of conversion in environments where radiant energy is unavailable. 5 Both modes of activation present in dual-cured resin cements are complementary and independent. 6 Furthermore, some dual resin cements are dependent on light activation, resulting in an inadequate degree of conversion if the cement is not light cured.…”

Section: Introductionmentioning

confidence: 99%

Effect of energy density and delay time on the degree of conversion and Knoop microhardness of a dual resin cement

Mainardi

Giorgi

Lima

et al. 2014

J of Invest & Clin Dent

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Degree of conversion of three composite materials employed in the adhesive cementation of indirect restorations: A micro-Raman analysis

Cited by 79 publications

References 41 publications

Effect of timing for core preparation, luting cement type and root level on adhesion of fiber posts to intraradicular dentin

Effect of timing for core preparation, luting cement type and root level on adhesion of fiber posts to intraradicular dentin

Degree of Conversion of Luting Resins Around Ceramic Inlays in Natural Deep Cavities: A Micro-Raman Spectroscopy Analysis

Effect of energy density and delay time on the degree of conversion and Knoop microhardness of a dual resin cement

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