Effect of adhesive system type and root region on the push‐out bond strength of glass–fibre posts to radicular dentine

Onay, Emel Olga; Korkmaz, Yonca; Kiremitçi, Arlin

doi:10.1111/j.1365-2591.2009.01643.x

Cited by 40 publications

(47 citation statements)

References 34 publications

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“…Despite the methodological differences, previous studies (2,3,20,(22)(23)(24) have also verified higher bond strength in the coronal root canal region. Analysis of the failure modes confirm the lower values of adhesion in the apical region, with predominance of adhesive and mixed-type failures in this region.…”

Section: Discussionmentioning

confidence: 95%

“…Unlike Yoldas and Alaçan (19), who found that the polymerization of resin material has occurred at a 15 mm depth, the present results suggest that the polymerization of cement was compromised in the apical region, where the light has a reduced range. The differences among post/canal regions can be explained by the regional differences in the root dentin such as quantity, volume and orientation of the tubules toward the apical portion, apical sclerosis (20), the high cavity configuration factor, the difficulty in visualization and access to this region, restrictions in the flow and distribution of material in the apical region that makes more bubbles and voids within the cement (21) and presence of smear layer formed during the post space preparation, which could not be modified by the adhesive cement or removed by irrigation with sodium hypochlorite and EDTA (22). Another aspect to be considered is the limited light transmission capability of the fiber post used in the present study (22), with impaired polymerization of cement and bonding quality in the apical portion (5,22).…”

Section: Discussionmentioning

confidence: 99%

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Effect of light-activation with different light-curing units and time intervals on resin cement bond strength to intraradicular dentin

et al. 2012

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The aim of this study was to assess the bond strength of a resin cement to intraradicular dentin varying the light-curing unit and the moment at which the light was applied. Post spaces of endodontically treated canines were prepared. The roots were distributed into 6 groups (n=10) according to the light-curing unit and the moment of light exposure: I) Quartz tungsten halogen-600 mW/cm² (QTH) + immediate light activation (t0); II) QTH + light activation after 10 min (t10); III) Light-emitting diodes (LED)-800 mW/cm² (LED-800)+ t0; IV) LED-800 + t10; V) LED-1,500 mW/cm² (LED-1500)+ t0; VI) LED-1500 + t10. After post cementation, slices from coronal, middle and apical post/root regions were submitted to the push-out test and failure evaluation. It was verified that LED-800 (4.40 ± 3.00 MPa) and LED-1500 (4.67 ± 3.04 MPa) provided bond strength statistically superior to QTH (3.13 ± 1.76 MPa) (p<0.05), and did not differ from each other (p>0.05). There was no significant difference between t0 and t10 (p>0.05). Coronal post/root region (4.75 ± 3.10 MPa) presented significantly higher bond strength than the apical (3.32 ± 2.30 MPa) (p<0.05) and middle regions (4.14 ± 2.99 MPa) showed intermediate values. Adhesive failures were predominant when using QTH. Adhesive and mixed failures occurred more frequently in the apical region. Higher adhesion of the resin cement to intraradicular dentin was observed in the coronal region with LED light-activation, regardless of the moment of light exposure.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Effect of light-activation with different light-curing units and time intervals on resin cement bond strength to intraradicular dentin

et al. 2012

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“…It was suggested that such lower degrees of conversion result in lower bond strengths at those root-canal depth levels at which photoactivation is ineffective. [17][18][19][20][21][22][23][24][25][26]30 In the group in which the light was directly applied to the apical area of the root canal, the bond strength showed significant improvement. Studies have shown that in the apical third, dentin exhibits conditions that are less favorable for adhesion, 14,16 such as a lower number of dentinal tubules, [12][13][14] and a greater probability of presenting endodontic treatment remnants.…”

Section: Discussionmentioning

confidence: 99%

“…16 Techniques for post cementation based on resin infiltration in the interior dentinal tubules are more sensitive and less predictable in the apical area. 14,16 Although several studies [17][18][19][20][21][22][23][24][25][26] have shown that resin cement bond strengths inside the apical third of the post space preparations are lower than those at the cervical third, some authors [27][28][29] were unable to confirm this difference. Thus, it is important to investigate the factors influencing bond strength of resin cements in the apical third of the post space preparation, emphasizing the role of photoactivation and dentinal substrate in that root canal area.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Light-curing Access and Different Resin Cements on Apical Bond Strength of Fiber Posts

Daleprane

Pereira

Oréfice

et al. 2014

Operative Dentistry

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B Daleprane C Nemesio de Barros Pereira RL Oréfice AC Bueno RR Vaz AN Moreira CS Magalhã es Clinical RelevanceCementation of fiber glass posts with self-adhesive cement (RelyX U100) is more predictable than cementation with resin cement using a three-step etch-and-rinse adhesive system (RelyX ARC/SBMP) as its bond strength to apical dentin was not influenced by the level of light-curing access. SUMMARYPurpose: This study evaluated the effect of light-curing access on the bond strength of fiber glass posts to the apical area of bovine roots using self-adhesive cement or dual-cured cement with an etch-and-rinse adhesive system.Materials and Methods: The root canals of 60 bovine teeth were endodontically treated and filled. A 15-mm-length post space was prepared and roots were randomly divided into three groups, simulating the levels of light-curing access: coronal (C), with 15-mm post space; middle (M), in which the coronal thirds of roots were cut out, leaving a 10-mm post space; and apical (A), in which the coronal and middle thirds of roots were cut out, leaving a 5-mm post space. Fiber glass posts (Reforpost # 3, Angelus) were cemented with RelyX U100 (3M ESPE) or RelyX ARC/Scotchbond Multi Purpose Plus (SBMP) (3M ESPE) (n=10) and lightcured. After 24 hours, the apical thirds of roots were sectioned perpendicularly to the long axis and submitted to a push-out test (0.5 mm/

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“…5 Because the accessibility of light energy passing through a deep and narrow root canal space is restricted, the bond strength gradually decreases from the coronal to the apical surface of the root canal. 6 Therefore, light irradiation of an adhesive seems to be important for core build-up systems to achieve good adhesion to root canal dentin. 7 Because there is little information on the mechanism by which light irradiation of adhesives affects the dentin bond strength of dualcure direct core build-up systems, determining the influence of light intensity on the dentin bonding characteristics of these resin systems is required.…”

Section: Introductionmentioning

confidence: 99%

Influence of Light Intensity on Surface Free Energy and Dentin Bond Strength of Core Build-up Resins

Shimizu

Tsujimoto

Furuichi³

et al. 2015

Operative Dentistry

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SUMMARY Objective We examined the influence of light intensity on surface free energy characteristics and dentin bond strength of dual-cure direct core build-up resin systems. Methods Two commercially available dual-cure direct core build-up resin systems, Clearfil DC Core Automix with Clearfil Bond SE One and UniFil Core EM with Self-Etching Bond, were studied. Bovine mandibular incisors were mounted in acrylic resin and the facial dentin surfaces were wet ground on 600-grit silicon carbide paper. Adhesives were applied to dentin surfaces and cured with light intensities of 0 (no irradiation), 200, 400, and 600 mW/cm2. The surface free energy of the adhesives (five samples per group) was determined by measuring the contact angles of three test liquids placed on the cured adhesives. To determine the strength of the dentin bond, the core build-up resin pastes were condensed into the mold on the adhesive-treated dentin surfaces according to the methods described for the surface free energy measurement. The resin pastes were cured with the same light intensities as those used for the adhesives. Ten specimens per group were stored in water maintained at 37°C for 24 hours, after which they were shear tested at a crosshead speed of 1.0 mm/minute in a universal testing machine. Two-way analysis of variance (ANOVA) and a Tukey-Kramer test were performed, with the significance level set at 0.05. Results The surface free energies of the adhesive-treated dentin surfaces decreased with an increase in the light intensity of the curing unit. Two-way ANOVA revealed that the type of core build-up system and the light intensity significantly influence the bond strength, although there was no significant interaction between the two factors. The highest bond strengths were achieved when the resin pastes were cured with the strongest light intensity for all the core build-up systems. When polymerized with a light intensity of 200 mW/cm2 or less, significantly lower bond strengths were observed. Conclusions The data suggest that the dentin bond strength of core build-up systems are still affected by the light intensity of the curing unit, which is based on the surface free energy of the adhesives. On the basis of the results and limitations of the test conditions used in this study, it appears that a light intensity of >400 mW/cm2 may be required for achieving the optimal dentin bond strength.

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Effect of adhesive system type and root region on the push‐out bond strength of glass–fibre posts to radicular dentine

Abstract: The use of BisCem and All Bond SE/Duo-Link combination with their simplified application procedures may be considered an alternative to the currently used systems for luting glass-fibre posts in root canal.

Cited by 40 publications

References 34 publications

Effect of light-activation with different light-curing units and time intervals on resin cement bond strength to intraradicular dentin

Effect of light-activation with different light-curing units and time intervals on resin cement bond strength to intraradicular dentin

The Effect of Light-curing Access and Different Resin Cements on Apical Bond Strength of Fiber Posts

Influence of Light Intensity on Surface Free Energy and Dentin Bond Strength of Core Build-up Resins

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