Effects of Flowable Composite Resin and curing method on Microleakage

Objective: To evaluate the effect of a new application method of bulk-fill flowable composite resin material on bond-strength, nanoleakage, and mechanical properties of dentine bonding agents. Materials and methods: Sound extracted human molars were randomly divided into: manufacturer’s instructions (MI), manual blend 2 mm (MB2), and manual blend 4 mm (MB4). Occlusal enamel was removed and flattened, dentin surfaces were bonded by Prime & Bond universal (Dentsply and Optibond FL, Kerr). For the MI group, adhesives were applied following the manufacturer’s instructions then light-cured. For MB groups, SDR flow+ bulk-fill flowable composite resin was applied in 2- or 4-mm increment then manually rubbed by a micro brush for 15 s with uncured dentine bonding agents and the mixture was light-cured. Composite buildup was fabricated incrementally using Ceram.X One, Dentsply nanohybrid composite resin restorative material. After 24-h water storage, the teeth were sectioned to obtain beams of about 0.8 mm2 for 24-h and thermocycled micro-tensile bond strength at 0.5 mm/min crosshead speed. Degree of conversion was evaluated with micro-Raman spectroscopy. Contraction gaps at 24 h after polymerization were evaluated and atomic force microscopy (AFM) nano-indentation processes were undertaken for measuring the hardness across the interface. Depth of resin penetration was studied using a scanning electron microscope (SEM). Bond strength data was expressed using two-way ANOVA followed by Tukey’s test. Nanoindentation hardness was separately analyzed using one-way ANOVA. Results: Factors “storage F = 6.3” and “application F = 30.11” significantly affected the bond strength to dentine. For Optibond FL, no significant difference in nanoleakage was found in MI/MB4 groups between baseline and aged specimens; significant difference in nanoleakage score was observed in MB2 groups. Confocal microscopy analysis showed MB2 Optibond FL and Prime & Bond universal specimens diffusing within the dentine. Contraction gap was significantly reduced in MB2 specimens in both adhesive systems. Degree of conversion (DC) of the MB2 specimens were numerically more compared to MS1 in both adhesive systems. Conclusion: Present study suggests that the new co-blend technique might have a positive effect on bond strengths of etch-and-rinse adhesives to dentine.

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814 Fatigue Strength of New Flowable Composite Resin

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2007.597 ◽

2007 ◽

Vol 2007 (0) ◽

pp. 597-598

Author(s):

Izuru Nishikawa ◽

Hiroki Takimoto

Keyword(s):

Fatigue Strength ◽

Composite Resin ◽

Flowable Composite

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Effect of light-curing method on wear and hardness of composite resin

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2009.06.002 ◽

2010 ◽

Vol 3 (2) ◽

pp. 216-222 ◽

Cited By ~ 15

Author(s):

Ibrahim M. Hammouda

Keyword(s):

Composite Resin ◽

Light Curing ◽

Curing Method ◽

Effect Of Light

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Microleakage of Cavity Class V Restored by Composite Resin and Conventional Flowable Composite Restorations in Primary Molars Conditioned by Er,Cr:YSGG Laser Versus Conventional method (An in Vitro Study)

Egyptian Dental Journal ◽

10.21608/edj.2021.47226.1302 ◽

2021 ◽

Vol 67 (2) ◽

pp. 1017-1024

Author(s):

Ayman Sabbah

Keyword(s):

Conventional Method ◽

Composite Resin ◽

In Vitro Study ◽

Vitro Study ◽

Primary Molars ◽

Class V ◽

Flowable Composite ◽

Composite Restorations

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Comparative Evaluation of Microtensile Bond Strength of Three Restorative Materials

Biointerface Research in Applied Chemistry ◽

10.33263/briac106.66886694 ◽

2020 ◽

Vol 10 (6) ◽

pp. 6688-6694

Keyword(s):

Bond Strength ◽

Composite Resin ◽

Tensile Bond Strength ◽

Restorative Material ◽

Third Molars ◽

Microtensile Bond Strength ◽

Flowable Composite ◽

Carious Lesions ◽

Occlusal Surfaces ◽

Frequent Failure

The present study aimed to compare the micro-tensile bond strength of new and conventional glass-ionomers and Z350 flowable composite resin to sound and caries-affected dentin. Eighty extracted third molars were selected. Standard Cl I cavities were prepared on occlusal surfaces. Forty teeth were assigned to the sound tooth group, and in the remaining 40 teeth, carious lesions were produced using a laboratory technique. Then each group (n=40) was subdivided into 5 groups (n=8) in terms of the restorative material used (EQUIA® Forte, Ketac Molar, encapsulated and hand-mixed GC Fuji II LC glass-ionomers and Z350 flowable composite resin). The cavities were restored. The highest micro-tensile bond strength was recorded with Z350 flowable composite resin in sound dentin (29.65), and the lowest was recorded with GC Fuji II LC (powder, liquid) in affected dentin (7.88). Significant differences were detected in the micro-tensile bond strength between the 5 restorative material groups. The composite resin bond strength was the maximum and was significantly different from all the other groups. The micro-tensile bond strength was affected by the type of dentin; in this context, in all the restorative groups, the bond strength in sound dentin was significantly higher than that in affected dentin. The most frequent failure mode was adhesive in the sound and affected dentin.

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