Stability of bonds made to superficial vs. deep dentin, before and after thermocycling

Zhang, Ling; Wang, Dan-Yang; Fan, Jing; Li, Fang; Chen, Yujiang; Chen, Jihua

doi:10.1016/j.dental.2014.08.362

Cited by 35 publications

(37 citation statements)

References 28 publications

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“…At the superficial dentin, the hybrid layer formation is more than resin tags as the number of dentinal tubules in proportion to inter-tubular dentin is lesser than that at deep dentin (13) . These findings were in agreement with several authors (14)(15)(16)(17)(18) . On the other hand, these findings were in disagreement with Lopes et al, 2009 (19) who concluded that bond strength to deep dentin in vivo was similar to shallow dentin.…”

Section: Discussionsupporting

confidence: 83%

In-vivo Bond Degradation Resistance and In-vitro Degree of Conversion of Bulk Fill Versus Nano Filled Resin Composite Restoratives

et al. 2017

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Aim: This study was conducted to evaluate bulk fill and nanohybrid resin composite at different cavity depth and after different testing periods. Materials & methods:Standardized simple box class II occluso-mesial (OM) cavities were prepared in the selected first maxillary premolar in each quadrant. The cavity depth was adjusted to be either 2mm or 4mm in each patient. For the bulkfill composite, both the two and four-millimeters cavities, one increment of the resin composite material (Xtra-fil) was packed inside the cavity while for the nanohybrid resin composite (Grandio), the four millimeters cavities were filled incrementally by packing two increments of 2mm thickness while for the two millimeters cavities one increment (2mm) was packed to fill the cavity and light cured for 20 seconds, finished, polished and left for the assigned time. The restored tooth was extracted atraumatically and teeth were sectioned to produce beam-shaped specimens of (1 ± 0.1 mm 2 ). The beam specimens were attached with cyanoacrylate gel to fit the Instron Universal testing machine. The tensile load was applied at a cross-head speed of 0.5mm/minute until specimen failure occurred. At this point the failure load in Newton was recorded.Results: Cavity depth of 2 mm showed the highest significant mean microtensile bond strength compared with that of 4 mm. Nanohybrid resin composite showed the highest significant mean micro tensile compared with Bulkfill resin composite. The testing period of 24 hours showed highest significant mean microtensile bond strength that one tested after 3 and 6 months. Conclusion:(1) cavity depth has an apparent influence on tensile bond strength of the tested restoratives to dentin. (2) Microtensile bond strength of the tested restorations deteriorates by aging.

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Section: Discussionsupporting

confidence: 83%

In-vivo Bond Degradation Resistance and In-vitro Degree of Conversion of Bulk Fill Versus Nano Filled Resin Composite Restoratives

et al. 2017

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“…Three hundred cycles of thermocycling significantly decrease bond strength and 10,000 thermal cycles correspond to one year of clinical function [55,56]. Moreover, thermocycling for 5000 cycles had been proven to be an effective method to accelerate collagen degradation of adhesive treated dentin [57]. Thus, 5000 cycles of thermocycling was used in this study to simulate six months of clinical function.…”

Section: Discussionmentioning

confidence: 99%

Epigallocatechin-3-gallate and Epigallocatechin-3-O-(3-O-methyl)-gallate Enhance the Bonding Stability of an Etch-and-Rinse Adhesive to Dentin

Zhang

Fan

et al. 2017

Materials

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This study evaluated epigallocatechin-3-gallate (EGCG) and epigallocatechin-3-O-(3-O-methyl)-gallate (EGCG-3Me) modified etch-and-rinse adhesives (Single Bond 2, SB 2) for their antibacterial effect and bonding stability to dentin. EGCG-3Me was isolated and purified with column chromatography and preparative high performance liquid chromatography. EGCG and EGCG-3Me were incorporated separately into the adhesive SB 2 at concentrations of 200, 400, and 600 µg/mL. The effect of cured adhesives on the growth of Streptococcus mutans (S. mutans) was determined with scanning electron microscopy and confocal laser scanning microscopy; the biofilm of bacteria was further quantified via optical density 600 values. The inhibition of EGCG and EGCG-3Me on dentin-originated collagen proteases activities was evaluated with a proteases fluorometric assay kit. The degree of conversion (DC) of the adhesives was tested with micro-Raman spectrum. The immediate and post-thermocycling (5000 cycles) bond strength was assessed through Microtensile Bond Strength (MTBS) test. Cured EGCG/EGCG-3Me modified adhesives inhibit the growth of S. mutans in a concentration-dependent manner. The immediate MTBS of SB 2 was not compromised by EGCG/EGCG-3Me modification. EGCG/EGCG-3Me modified adhesive had higher MTBS than SB 2 after thermocycling, showing no correlation with concentration. The DC of the adhesive system was affected depending on the concentration of EGCG/EGCG-3Me and the depth of the hybrid layer. EGCG/EGCG-3Me modified adhesives could inhibit S. mutans adhesion to dentin–resin interface, and maintain the bonding stability. The adhesive modified with 400 µg/mL EGCG-3Me showed antibacterial effect and enhanced bonding stability without affect the DC of adhesive.

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“…Root dentine type and morphology are variable along the whole length of root canals and between specimens that may influence its ability to form bond with the sealers. Effort to standardize the dentine is directed to sample size selection and appropriate randomization (21,22).…”

mentioning

confidence: 99%

Assessment of Push-Out Bond Strength and Interfacial Adaptation of Two New Endodontic Sealers; Endosequence Bc and Mta Fillapex to Root Canal Dentine (An in Vitro Study).

Nafiz¹,

Yacoub²,

Ahmed³

2018

IJAR

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Introduction: the aim of this in vitro study was to evaluate push-out bond strength and interfacial adaptation to dentine wall of EndoSequence BC (BC) and MTA Fillapex sealers compared to AH Plus sealer (AH+). Methods: sixty-six human extracted single rooted teeth with single root canal were selected and the crowns were removed at the level of CEJ to standardized the roots length (16 mm). Samples were instrumented using ProTaper universal NiTi rotary system up to size F5. After irrigation and smear layer removal samples were randomly divided according to tested sealer used into three groups of 22 sample each, and then obturated using lateral compaction technique and stored for 1 week before testing. Each group was subdivided according to test into two subgroups of 11 sample each, push-out test or interfacial adaptation. Data were statistically analyzed by one-way ANOVA and Tukay's post-hoc test (P≤0.05). Results: AH Plus has a statistically significant higher bond strength value than each of EndoSequence BC group and MTA Fillapex group. Regarding interfacial adaptation there was no statistically significant difference between the three sealers. Conclusion: EndoSequence BC bioceramic sealer, MTA Fillapex MTA based sealer showed their inferiority regarding push-out bond strength when compared to AH Plus resin based sealer. All of the three sealers showed different grades of gap width along the whole length of root canal wall.

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Stability of bonds made to superficial vs. deep dentin, before and after thermocycling

Cited by 35 publications

References 28 publications

In-vivo Bond Degradation Resistance and In-vitro Degree of Conversion of Bulk Fill Versus Nano Filled Resin Composite Restoratives

In-vivo Bond Degradation Resistance and In-vitro Degree of Conversion of Bulk Fill Versus Nano Filled Resin Composite Restoratives

Epigallocatechin-3-gallate and Epigallocatechin-3-O-(3-O-methyl)-gallate Enhance the Bonding Stability of an Etch-and-Rinse Adhesive to Dentin

Assessment of Push-Out Bond Strength and Interfacial Adaptation of Two New Endodontic Sealers; Endosequence Bc and Mta Fillapex to Root Canal Dentine (An in Vitro Study).

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