Influence of increment thickness on microhardness and bond strength in composite resins

The aim of this study was to evaluate the Knoop microhardness and the microtensile bond strength of a second-generation of bulk-fill (BF) and a nanohybrid composite resins (NH) in different thicknesses of increments. For this, ninety disks of composite resin were made for Knoop microhardness, being divided into six groups (n = 15). The Knoop microhardness obtained in each millimeter of the internal face. For microtensile bond strength, ninety restored in third molars were used, divided into six groups (n = 15). For Knoop microhardness, the Wilcoxon and Friedman test was used. For the microtensile bond strength were used the Two-way Anova test and Tukey's post-test (p <0.05). The NH resin showed higher Knoop micro hardness than BF and it was observed that hardness value decreases as increases the thickness of the resin. There was no significant difference in microtensile bond strength comparing NH and BF. However, there was a significant difference between G2 and G4 for the NH groups, with the highest and lowest bond strength values, respectively. Thus, the new generation of the bulk-fill composite resin provided lower microhardness values as the thickness of the increments increases in comparison with the nanohybrid composite resin. The microtensile bond strength does not appear to have been influenced by the type of resin, or the thickness of the increment.

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Microtensile Bond Strength of Methacrylate and Silorane Resins to Enamel and Dentin

Brazilian Dental Journal ◽

10.1590/0103-6440201300009 ◽

2014 ◽

Vol 25 (4) ◽

pp. 327-331 ◽

Cited By ~ 5

Author(s):

Gisele Rodrigues da Silva ◽

Isabela Sousa Araújo ◽

Rodrigo Dantas Pereira ◽

Bruno de Castro Ferreira Barreto ◽

Célio Jesus do Prado ◽

...

Keyword(s):

Bond Strength ◽

Aging Time ◽

Storage Time ◽

Composite Resin ◽

Glass Plate ◽

Composite Resins ◽

Microtensile Bond Strength ◽

Bonding Interaction ◽

Significant Difference ◽

And Storage

The aim of this study was to evaluate the microtensile bond strength (µTBS) of two substrates (enamel and dentin) considering two study factors: type of composite resin [methacrylate-based (Filtek Supreme) or silorane-based (Filtek LS)] and aging time (24 h or 3 months). Twenty human molars were selected and divided into 2 groups (n=10) considering two dental substrates, enamel or dentin. The enamel and dentin of each tooth was divided into two halves separated by a glass plate. Each tooth was restored using both tested composite resins following the manufacturer's instructions. The samples were sectioned, producing 4 sticks for each composite resin. Half of them were tested after 24 h and half after 3 months. µTBS testing was carried out at 0.05 mm/s. Data were analyzed by three-way ANOVA and Tukey's HSD tests at α=0.05. Significant differences between composite resins and substrates were found (p<0.05), but no statistically significant difference was found for aging time and interactions among study factors. The methacrylate-based resin showed higher µTBS than the silorane-based resin. The µTBS for enamel was significantly higher than for dentin, irrespective of the composite resin and storage time. Three months of storage was not sufficient time to cause degradation of the bonding interaction of either of the composite resins to enamel and dentin.

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Effect of adhesive mode and chlorhexidine on microtensile strength of universal bonding agent to sound and caries-affected dentins

European Journal of Dentistry ◽

10.4103/ejd.ejd_239_18 ◽

2018 ◽

Vol 12 (04) ◽

pp. 553-558 ◽

Cited By ~ 1

Author(s):

Joyce Figueiredo Macedo de Lima ◽

Danielle Wajngarten ◽

Fariya Islam ◽

Johanna Clifford ◽

Ana Carolina Botta

Keyword(s):

Phosphoric Acid ◽

Bond Strength ◽

Composite Resin ◽

High Viscosity ◽

Bonding Agent ◽

Third Molars ◽

Microtensile Bond Strength ◽

Etch And Rinse ◽

Significant Difference ◽

Self Etch

ABSTRACT Objective: The main objective of this study is to assess the effect of the adhesive mode and chlorhexidine (CHX) on the microtensile strength of a universal bonding agent to sound and caries-affected dentins. Materials and Methods: Six intact third molars and six decayed third molars were sectioned to obtain two middle dentin specimens per tooth. Prime and Bond Elect Universal (Dentsply) was applied to specimens in two different modes: Etch-and-rinse (ER, phosphoric acid for 15s) and self-etch (SE, no phosphoric acid). 2% CHX (Cavity Cleanser, Bisco) was applied to both dentins for 30 s. Specimens were randomly assigned into eight groups (n = 3) according to the treatments applied to sound and caries-affected dentins: SE; ER; SE + CHX; and ER + CHX. All specimens were restored with TPH Spectra High Viscosity (Dentsply) composite resin and sectioned to obtain specimens of 0.8 ± 0.1 mm2. The microtensile bond strength test was conducted at 1 mm/min. The data were statistically analyzed by ANOVA and multiple comparisons' test (α = 0.05). Results: There was no significant difference between sound dentin and caries-affected dentin (P = 0.132). The highest bond strength was obtained with the application of the ER (31.81MPa). SE + CHX promoted the lowest bond strength with no statistical difference to ER + CHX (P > 0.05). Conclusions: ER mode for the universal bonding agent yielded the highest bond strength to sound and caries-affected dentins. CHX reduced the bond strength to both dentins regardless the application of phosphoric acid. Clinical Significance: The universal bonding agent increased the bond strength to sound and caries-affected dentins when applied by the ER mode.

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Impact of Intracoronal Dentin Treatment Prior to Bleaching on Bond Strength of Restorative Materials

Brazilian Dental Journal ◽

10.1590/0103-6440201302441 ◽

2014 ◽

Vol 25 (6) ◽

pp. 519-523 ◽

Cited By ~ 2

Author(s):

Erica Moreno Zanconato-Carvalho ◽

João Felipe Bruniera ◽

Natália Spadini de Faria ◽

Vivian Colucci ◽

Danielle Cristine Messias

Keyword(s):

Phosphoric Acid ◽

Bond Strength ◽

Surface Treatment ◽

Shear Bond Strength ◽

Composite Resin ◽

Er:Yag Laser ◽

Composite Resins ◽

Bleaching Procedure ◽

Significant Difference ◽

Restorative Materials

Surface treatment of dentin before the bleaching procedure may affect its permeability and influence the bond strength of restorative materials. This study evaluated the influence of surface treatment before the bleaching on shear bond strength (SBT) of restorative materials to intracoronal dentin. Dentin slabs were subjected to surface treatment: no bleaching (control - CON), no surface treatment + bleaching (HP), 37% phosphoric acid + bleaching (PA) and Er:YAG laser + bleaching (L). After the bleaching procedure, specimens (n=10) were restored with: microhybrid composite resin (MH), flowable composite resin (F), and resin-modified glass-ionomer cement (RMGIC). The shear test was carried out. ANOVA and Tukey's test (α=0.05) showed significant difference for surface treatment and restorative materials (p<0.05). CON presented higher STB and was statistically different from HP (p<0.05). PA and L showed intermediate values and were statistically similar to CON and HP (p>0.05). STB for MH and F were higher than RMGIC (p<0.05), and did not differ from each other (p>0.05). The surface treatments with phosphoric acid and Er:YAG laser before the bleaching procedure provided shear bond strength at the same level of unbleached dentin and the composite resins presented superior bond strength to the intracoronal dentin.

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Comparison of microleakage of an alkasite restorative material, a composite resin and a resin-modified glass ionomer

Brazilian Journal of Oral Sciences ◽

10.20396/bjos.v20i00.8663981 ◽

2021 ◽

Vol 20 ◽

pp. e213981

Author(s):

Fariba Motevasselian ◽

Hamid Kermanshah ◽

Ebrahim Rasoulkhani ◽

Mutlu Özcan

Keyword(s):

Composite Resin ◽

Composite Resins ◽

Glass Ionomer ◽

Etch And Rinse ◽

Significant Difference ◽

Resin Modified Glass Ionomer ◽

Group A ◽

Nanohybrid Composite ◽

Group B ◽

Group D

Aim: To compare the microleakage of Cention N, a subgroup of composite resins with a resin-modified glass ionomer (RMGI) and a composite resin. Methods: Class V cavities were prepared on the buccal and lingual surfaces of 46 extracted human molars. The teeth were randomly assigned to four groups. Group A: Tetric N-Bond etch-and-rinse adhesive and Tetric N-Ceram nanohybrid composite resin, group B: Cention N without adhesive, group C: Cention N with adhesive, and group D: Fuji II LC RMGI. The teeth were thermocycled between 5°-55°C (×10,000). The teeth were coated with two layers of nail vanish except for 1 mm around the restoration margins, and immersed in 2% methylene blue (37°C, 24 h) before buccolingual sectioning to evaluate dye penetration under a stereomicroscope (×20). The data were analyzed by the Kruskal-Wallis and Wilcoxon tests (α=0.05). Results: Type of material and restoration margin had significant effects on the microleakage (p<0.05). Dentin margins showed a higher leakage score in all groups. Cention N and RMGI groups showed significant differences at the enamel margin (p=0.025, p=0.011), and for the latter group the scores were higher. No significant difference was found at the dentin margins between the materials except between Cention N with adhesive and RMGI (p=0.031). Conclusion: Microleakage was evident in all three restorative materials. Cention N groups showed similar microleakage scores to the composite resin and displayed lower microleakage scores compared with RMGI.

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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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Low- and high-viscosity bulk-fill resin composites: a comparison of microhardness, microtensile bond strength, and fracture strength in restored molars

Acta Odontológica Latinoamericana ◽

10.54589/aol.34/2/173 ◽

2021 ◽

Vol 34 (2) ◽

pp. 173-182

Author(s):

Fabiana França ◽

Jonathan Tenuti ◽

Isabela Broglio ◽

Lara Paiva ◽

Roberta Basting ◽

...

Keyword(s):

Bond Strength ◽

Fracture Strength ◽

High Viscosity ◽

Fracture Pattern ◽

Resin Composites ◽

Microtensile Bond Strength ◽

Thermomechanical Cycling ◽

Low Viscosity ◽

Significant Difference ◽

Knoop Microhardness

The aim of this study was to compare low- and high-viscosity bulk-fill composites for Knoop microhardness (KHN), microtensile bond strength (MTBS) to dentin in occlusal cavities, and fracture strength (FS) in molars with mesialocclusal-distal restoration. Disk-shaped samples with different thicknesses (2 or 4 mm) of low-viscosity (SDR Flow, Dentsply) and high-viscosity bulk-fill composites (Filtek BulkFill, 3M ESPE; and Tetric-N Ceram Bulk Fill, Ivoclar Vivadent) were prepared for top and bottom KHN analysis (n=10). MTBS to dentin and fracture pattern was evaluated in human molars with occlusal cavities restored with (n=10): conventional nanocomposite (Z350XT, 3M ESPE), low-viscosity (Filtek Bulk-fill Flow, 3M ESPE) or high-viscosity bulk-fill composites (Filtek BulkFill). The FS and fracture pattern of human molar with mesial-occlusal-distal restorations submitted or not to thermomechanical cycling were investigated (n=10) using: intact tooth (control), and restoration based on conventional microhybrid composite (Z250, 3M ESPE), low-viscosity (SDR Flow) or high-viscosity bulk-fill composites (Filtek BulkFill). The data were submitted to split-plot ANOVA (KHN), one-way ANOVA (MTBS), two-way ANOVA (FS) followed by Tukey’s test (α=0.05). For KHN, there was no significant difference for the resin composites between the top and bottom. For MTBS, no significant differences among the materials were detected; however, the low-viscosity composite presented lower frequency of adhesive failures. For FS, there was no significant difference between composites and intact tooth regardless of thermomechanical cycling. Low- and high-viscosity bulk-fill composites have comparable microhardness and microtensile bond strength when used in occlusal restorations. Likewise, the bulk-fill composites present similar fracture strength in molars with mesio-occlusal-distal restorations.

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In Vitro Evaluation of Onlay Restorations on Primary Teeth

The International Journal of Artificial Organs ◽

10.5301/ijao.5000630 ◽

2017 ◽

Vol 40 (12) ◽

pp. 709-713

Author(s):

Kadriye G.U. Güzel ◽

Ayşe C. Altun ◽

Zuhal Kirzioğlu

Keyword(s):

Bond Strength ◽

Primary Teeth ◽

Composite Resin ◽

Permanent Teeth ◽

Primary Tooth ◽

Microtensile Bond Strength ◽

Significant Difference ◽

Bond Strengths ◽

Materials Used

Purpose Many novel materials have been developed such as composite resin, ceramic, zircon or metal-supported ceramic for use in aesthetic restoration of primary teeth and permanent teeth with extensive crown damage. The aim of the present study was to compare microtensile bond strengths on materials using the microtensile bond strength test. Materials and methods The microtensile bond strength on the primary tooth dentin was measured on extracted primary teeth using an indirect method and fracture patterns were evaluated. Results The analysis of bond strengths using the Mann-Whitney U-test did not show significant difference between the rank averages of the compomer and composite resin (p = 0.741). The dentin sections, from which test samples were obtained, contributed to the bond strength; dentin samples obtained just above the pulp had lower bond strength, and the difference was statistically significant (p = 0.005). The adhesive type fracture was the most prevalent fracture type for both materials. Conclusions When the chemical, physiological, and micromorphological differences between primary and permanent teeth are taken into consideration, the success of the materials used for restorations can be different between primary and permanent teeth. Therefore, materials used in the dentistry must be evaluated separately for primary teeth.

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Bond strength of composite resin containing biomaterial S-PRG to eroded dentin

Brazilian Journal of Oral Sciences ◽

10.20396/bjos.v16i0.8651050 ◽

2017 ◽

Vol 16 ◽

pp. 1-10

Author(s):

Alessandra Sanchez Coelho Lourenço ◽

Ana Paula Almeida Ayres ◽

Taís Fonseca Mantilla ◽

Marcelo Giannini ◽

Patricia Moreira de Freitas

Keyword(s):

Bond Strength ◽

Composite Resin ◽

Optical Microscope ◽

Fracture Pattern ◽

Supersaturated Solution ◽

Solution Ph ◽

Microtensile Bond Strength ◽

Significant Difference ◽

Restorative Materials ◽

Two Factors

Aim: To evaluate the bond strength of composite resin containing or not biomaterial (S-PRG) to sound/eroded dentine. Methods: Occlusal dentin of 30 human molars (n=15) had half of its surface kept uneroded, while on the other half an erosive lesion was produced by cycling in citric acid (pH 2.3) and supersaturated solution (pH 7.0). On both eroded (ED) and non-eroded (SD) substrates, two restorative systems (containing or not S-PRG) were tested. Composite resin cylinders were built and, after storage in water (24h), were submitted to bond strength test. The analysis of the fracture pattern was performed under an optical microscope (40x). The obtained values of bond strength (MPa) were submitted to ANOVA (two factors) and Tukey multiple comparisons tests (p<0.05). Results: According to the results, there was difference between substrates (<0.001) and restorative materials (p=0.002) evaluated. For the microtensile bond strength, the values obtained were: SDNB (47.6±12.2 MPa), SDWB (34.1±15.8 MPa), EDNB (31.1±8.3 MPa) and EDWB (15.5±13.6 MPa), revealing a statistically significant difference in the evaluated substrates and restorative materials. Conclusion: Bond strength of eroded substrate is inferior to the sound substrate and the restorative system containing S-PRG biomaterial influences negatively the results of bonding to sound/eroded dentin.

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Microtensile Bond Strength of Polyacid-modified Composite Resin to Irradiated Primary Molars

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-2235 ◽

2018 ◽

Vol 19 (2) ◽

pp. 189-195

Author(s):

Yucel Yilmaz ◽

Sultan Keles ◽

Orhan Sezen

Keyword(s):

Bond Strength ◽

Primary Teeth ◽

Composite Resin ◽

Tooth Enamel ◽

Primary Tooth ◽

Primary Molars ◽

Control Group ◽

Microtensile Bond Strength ◽

Significant Difference ◽

Tooth Dentin

ABSTRACT Aim This study evaluated the influence of various doses of radiotherapy on the microtensile bond strength (μTBS) of compomer resin to dentin and enamel in primary molars. Materials and methods Thirty-five intact primary molars were collected and divided into seven groups. Teeth were irradiated with doses from 10 to 60 Gy, except for the control group. Compomer restorations were performed, and enamel—compomer resin beams and dentin—compomer resin beams were tested at a crosshead speed of 1 mm/min. Results No statistically significant difference was found between the irradiated tooth enamel and the control group (F = 1.1468; p = 0.194). However, statistically significant differences were evident among the dentin groups (F = 11.050; p < 0.001). Conclusion Radiation may not cause a significant difference in the μTBS of compomer resin to primary tooth enamel, but appears to dose dependently decrease its bond strength to primary tooth dentin. Clinical significance Radiotherapy may affect the success rate of compomer fillings in primary teeth, especially in deeper cavities with exposed dentin. How to cite this article Keles S, Yilmaz Y, Sezen O. Microtensile Bond Strength of Polyacid-modified Composite Resin to Irradiated Primary Molars. J Contemp Dent Pract 2018;19(2):189-195.

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The Role of Epigallocathecin-3-gallate as an Antioxidant After Dental Bleaching on Shear Bond Strength of Composite Resin Restoration

Conservative Dentistry Journal ◽

10.20473/cdj.v11i1.2021.42-45 ◽

2021 ◽

Vol 11 (1) ◽

pp. 42

Author(s):

Syarifah Nadhira Assyafira Al-Habsyi ◽

Kun Ismiyatin ◽

Galih Sampoerno

Keyword(s):

Free Radicals ◽

Bond Strength ◽

Shear Bond Strength ◽

Composite Resin ◽

Composite Resins ◽

Dental Bleaching ◽

Tooth Discoloration ◽

Significant Difference ◽

Composite Resin Restorations

Background: Tooth discoloration can be treated with dental bleaching using Hydrogen peroxide (H2O2). Dental bleaching may interfere with the shear bond strength of composite resins because the remaining free radicals can affect bonding polymerization. Epigallocatcehin-3-gallate (EGCG) as an antioxidant can neutralize the free radicals produced during bleaching process. Purpose: Analyze the role of EGCG antioxidants in increasing the shear bond strength of composite resin after bleaching.. Reviews: Of the seven journals included in this literature review, six journals reported significant difference, and one journal noted no significant difference in the shear bond strength of composite resin following the EGCG application. Conclusion: The use of EGCG can increase the shear bond strength value of post-bleaching composite resin restorations.

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