Pre-heating of dual-polymerized resin core foundation system: effect on micro-shear bond strength, degree of conversion and ultimate tensile strength

Botros, Sara Adel; Soliman, Zainab; El-Korashy, Dalia I.; El-Askary, Farid Sabry

doi:10.1080/01694243.2020.1861869

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Pre-heating of regular-viscosity photo-polymerized composites is another approach to use them as luting materials for indirect restorations. Pre-heating reduces the viscosity, increases the flowability, and improves the adaptation of resin-based composites to cavity walls and margins [14,15,[21][22][23][26][27][28][29][30][31][32][33][34], with no harmful effect, due to the elevated temperature on dental pulp [34].…”

Section: Discussionmentioning

confidence: 99%

A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites

et al. 2022

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The aim of this study was to evaluate the effect of CAD/CAM composite thickness on micro-tensile bond strength (µTBS), microhardness (HV), and film thickness (FT) of different luting composites. Composite blocks (6.8 mm × 6.8 mm) were divided into 12 groups according to: CAD/CAM thickness and luting composite. For each group, 21 rods (1 mm × 1 mm) were tested in tension at crosshead speed of 1 mm/min. Fracture modes were categorized as adhesive, mixed, and cohesive. Microhardness (n = 5/group) was assessed using microhardness tester. Film thickness (12-rods/group) was evaluated using a stereomicroscope (×40). Data were analyzed using the two-way ANOVA/Tukey’s HSD test (p = 0.05). Parameters “thickness”, “cement”, and “thickness x cement” showed significant difference on µTBS and HV (p < 0.05). At 2 mm, heated x-tra fil composite showed the highest µTBS (45.0 ± 8.5 MPa), while at 4 mm thickness, Grandio Flow revealed the lowest µTBS (33.3 ± 6.3 MPa). Adhesive, mixed, and cohesive failures were reported. The HV of all composites decreased when photo-polymerized through 4 mm thickness (p < 0.05). Regardless of CAD/CAM thickness, photo-polymerized composites can be successfully used for luting CAD/CAM composite.

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Section: Discussionmentioning

confidence: 99%

A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites

et al. 2022

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“…Pre-heating of regular viscosity composite proved to decrease its viscosity and increase its owability [13,[29][30][31][32] to the level that it can be used as luting material for indirect restorations bonding. Pre-heating of composites at elevated temperature pushes monomers away from each other, makes them to be easy slide, which minimizes monomers' "internal friction" reducing their viscosities [33].…”

Section: Discussionmentioning

confidence: 99%

Is There a Correlation Between Physical Properties and Film Thickness of Dual- and Photo- polymerized Luting Resins and CAD/CAM-Dentin Micro-Tensile Bond Strength?

El-Askary,

Tadros,

Hassanien

et al. 2024

Preprint

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Objective To correlate µTBS of photo- and dual-polymerized luting resins with film thickness (FT), Vicker's hardness (HV) and ultimate-tensile strength (UTS).Methods Human molars (N = 30) were divided (6-groups) according to: 1: Luting resin: Dual- [Bifix QM, (BF)], or photo-polymerized [GrandioSo Heavy Flow (GHF) and VisCalor Bulk (VB)] and 2: Adhesive mode (Optibond Universal): Etch-and-rinse (ER) or self-etching (SE). CAD/CAM blocks (7x7x4mm3) were air-abraded (50µm Al2O3/10s/0.2MPa) and silanated. For ER, dentin was etched (15s), rinsed (30s), and blot-dried. For both modes, adhesive was applied (20s), air-dried (5s) and photo-polymerized (10s). Sticks (1x1mm2) were aged either for 24-hours or for 6-months. Sticks were pulled in tension (1mm/min). Debonded sticks were evaluated for failure mode. For FT, nine-bonded slabs/each cement were evaluated. For UTS, eight-hourglass specimens/each cement were tested. For HV, 5-discs/each cement were evaluated using Vicker’s hardness tester. Data were analysed using ANOVA/Pearson's correlation tests (α = 0.05).Results No correlation between µTBS/HV was revealed (P > 0.05). Positive correlation between µTBS/FT and µTBS/UTS (p < 0.05) were observed. Three-Way ANOVA revealed all experimental factors had significant effect on µTBS (p < 0.05). The VB showed significant lower µTBS (20.8 ± 9.3MPa). The ER mode showed higher µTBS (26.0 ± 10.9MPa), and 24-hours revealed the higher µTBS (27.4 ± 10.0MPa). Mixed failure was the predominate type (42.51%). The VB showed the highest FT (122.2 ± 11.9µm). The GHF revealed higher UTS and HV (112.5 ± 19.7MPa and 91.6 ± 0.4Kgf respectively).Conclusions Photo-polymerized flowable resin can substitute dual-polymerized cement for CAD/CAM composite bonding.Clinical relevance: Photo-polymerized flowable composite can replace the dual-polymerized resin cement one to bond CAD/CAM composite to dentin.

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“…Pre-heating of composite improved its Degree of conversion %. (37) The universal adhesive was used in all the groups to standardize process of the study (38) and to merge the advantages of self-etch (SE) adhesives, such as rapid application and low susceptibility to differences in operator technique with those of etch-and-rinse (ER) adhesives, such as effective and stable bonding to enamel (39)(40)(41) (3116)…”

Section: Discussionmentioning

confidence: 99%

Effect of Bulk- Filling, Snowplow and Injection-Molded Techniques on Nanoleakage of Class II Composite Restorations in Permanent Molars using different etching modes (An in vitro Study)

Mohamed,

El-Hussiny

2023

Egyptian Dental Journal

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Purpose :The Objective of this in vitro study was to compare nanoleakage in permanent molars restored with bulk-filling, snowplow and injection-molded composite application techniques using a universal adhesive with two different etching modes. Materials and Methods:A total of twenty four human permanent molars were used. Class II box was prepared on the proximal surfaces of molars. Forty eight specimens were randomly divided into three main equal groups according to resin composite application techniques, bulkfilling, snowplow and injection-molded techniques. Each group was further divided into two subgroups according to etching mode; etch and rinse mode and self -etch mode. Each specimen was sectioned mesiodistally and immersed in 50% freshly prepared silver nitrate solution for 24 hours followed by washing under running water and were kept for 8 hours in a photo-developer solution. The specimens and the silver nitrate amount were analyzed in (ESEM) within the adhesive layer, hybrid layer and the resin tags. Results:The results showed that there is a statistically significant difference in nanoleakage regarding to the three different composite application techniques. Bulk filling and injection molded techniques have mean values that are close to each other, while these mean values are greater than the ones snowplow have. There is a statistically significance difference between etch and rinse mode and self-etch mode. Also, the effect of etching mode on nanoleakage is more than twice as much as that of composite application technique. ConclusionUsing the "snowplow" technique with etch and rinse mode of universal adhesive, can decrease nanoleakage rate, moreover etching mode could influence the nanoleakage of universal adhesives.

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Pre-heating of dual-polymerized resin core foundation system: effect on micro-shear bond strength, degree of conversion and ultimate tensile strength

Cited by 5 publications

References 38 publications

A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites

A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites

Is There a Correlation Between Physical Properties and Film Thickness of Dual- and Photo- polymerized Luting Resins and CAD/CAM-Dentin Micro-Tensile Bond Strength?

Effect of Bulk- Filling, Snowplow and Injection-Molded Techniques on Nanoleakage of Class II Composite Restorations in Permanent Molars using different etching modes (An in vitro Study)

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