Immediate and delayed photoactivation of self-adhesive resin cements and retention of glass-fiber posts

Faria-e-Silva, André Luís; Peixoto, Aline Carvalho; Borges, Marcela Gonçalves; Menezes, Murilo de Sousa; Moraes, Rafael R.

doi:10.1590/s1806-83242014.50000005

Cited by 20 publications

(15 citation statements)

References 22 publications

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“…The polymerization shrinkage of these materials may exceed their bond strength, resulting in gaps forming at the dentin-resin cement interface, loss of retention and the displacement of the posts 4 . This may be caused by the stress that results from the polymerization shrinkage generated in the root canal by the composition of resin cements and different light curing techniques 10 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Is the bonding of self-adhesive cement sensitive to root region and curing mode?

Boing

Gomes

et al. 2017

J. Appl. Oral Sci.

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Objectives To evaluate the influence of two curing techniques on the degree of conversion (DC) of resin cements and on bond strength (BS) of fiber posts in different regions of root dentin.Material and Methods Twenty single-rooted premolars were endodontically treated, and the post spaces were prepared. The roots were randomly divided into two groups (n=10), according to the activation mode of the resin cement RelyX™ U200 (3M ESPE Saint Paul, MN, USA): conventional (continuous activation mode) and soft-start activation mode (Ramp). The posts (WhitePost DC/FGM) were cemented according to the manufacturer’s recommendations and, after one week, the roots were cross-sectioned into six discs each of 1-mm thickness, and the cervical, medium, and apical thirds of the root canals were identified. The DC was evaluated under micro-Raman spectroscopy and the BS was evaluated by the push-out test. The data were analyzed by two-way ANOVA and Tukey’s test (α=0.05).Results Neither the activation mode nor the root regions affected the DC of the resin cement. Higher BS was achieved in the soft-start group (p=0.036); lower BS was observed in the apical third compared to the other root regions (p<0.001). Irrespective of the activation mode and root region, the mixed failure mode was the most prevalent.Conclusion The BS of fiber posts to root canals can be improved by soft-started polymerization. The DC was not affected by the curing mode.

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Section: Introductionmentioning

confidence: 99%

Is the bonding of self-adhesive cement sensitive to root region and curing mode?

Boing

Gomes

et al. 2017

J. Appl. Oral Sci.

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“…It has been demonstrated that a delay time of 3 or 5 minutes prior to light-activation of dual-cured cements can reduce the shrinkage stress and improve the bond strength 7 without significantly altering the mechanical properties. 13,69,71 A delay in light activation of dual curing resin cement for cementing ceramic inlays reduced the post-gel shrinkage and decreased the shrinkage stresses at the pulpal floor, which may reduce post-operative sensitivity. 11 …”

Section: Use Of Bulk Fill Compositementioning

confidence: 99%

Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

et al. 2017

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Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with postoperative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations. Therefore, an indirect correlation can emerge between shrinkage stress and the longevity of composite restorations or resin-bonded ceramic restorations. The relationship between shrinkage and stress can be best studied in laboratory experiments and a combination of various methodologies. The objective of this review article is to discuss the concept and consequences of polymerization shrinkage and shrinkage stress of composite resins and resin cements. Literature relating to polymerization shrinkage and shrinkage stress generation, research methodologies, and contributing factors are selected and reviewed. Clinical techniques that could reduce shrinkage stress and new developments on low-shrink dental materials are also discussed.

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“…These deleterious effects mainly occur when post sectioning is performed immediately after post cementation. Since cement setting is mainly activated by chemical initiation during the post cementation (7), the resin cements usually exhibit a low degree of conversion immediately after the cementation and thus reduce the bond strength to dentin (8). In contrast, when post sectioning is performed after the core build-up, the resin cement exhibits an increased degree of conversion.…”

Section: Introductionmentioning

confidence: 99%

Does the Moment of Fiber Post Cutting Influence on the Retention to Root Dentin?

et al. 2015

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Despite several advantages associated with pre-fabricated glass-fiber posts, the coronal portion of these posts must be cut to allow their use in various clinical situations. However, cutting the cemented post can generate stress on the bonding interface and affect the bond strength. The aim of this study was to investigate the effect the of fiber post cutting on the bond strength of root canals. Sixty bovine incisor roots were included in resin cylinders with simulated periodontal ligaments. Glass-fiber posts were luted using regular resin cement RelyX ARC (3M ESPE) or self-adhesive cement RelyX Unicem (3M ESPE). The posts were cut prior to cementation, immediately after luting or after building up the core (n=10). After storage for 24 h, the samples were cut and subject to push-out testing using a mechanical testing machine (EMIC DL 2000). Data were analyzed using two-way ANOVA (resin cement x moment of post cutting) and Tukey's post hoc test (α=0.05). The moment of fiber post cutting did not affect the bond strength when Unicem was used. However, the bond strength was reduced when ARC was used and when the post was cut immediately. In conclusion, the moment of fiber post cutting may affect the retention of root canal posts when a regular resin cement is used.

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Immediate and delayed photoactivation of self-adhesive resin cements and retention of glass-fiber posts

Cited by 20 publications

References 22 publications

Is the bonding of self-adhesive cement sensitive to root region and curing mode?

Is the bonding of self-adhesive cement sensitive to root region and curing mode?

Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

Does the Moment of Fiber Post Cutting Influence on the Retention to Root Dentin?

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