scholarly journals Microhardness of Two Composite Resins with Different Curing Sources

2020 ◽  
Author(s):  
Ebaa Ibrahim Alagha ◽  
Mustafa Ibrahim Alagha
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Testing Machine ◽  
Composite Resins ◽  
Blue Laser ◽  
Light Sources ◽  
Energy Effect ◽  
The Difference ◽  
Laser Curing ◽  
Resin Curing

Abstract Background This study evaluated the influence of two light sources on the microhardness of two recent composite resins.Methods A total of one hundred and twenty specimens were prepared and divided into two groups according to the composite resin restoration used (Tetric EvoCeram Bulkfill) and (Universal Nanohybrid Mosaic). Each group was subdivided into four subgroups according to the light source used with different curing intervals: laser curing system (SIROLaser) for 10,15, and 20 seconds and conventional blue light system (LED) for 20 seconds. Microhardness testing machine was used to assess the microhardness. Two-way ANOVA was done for comparing resin composite and curing energy effect on different variable studied. One-way ANOVA followed by pair-wise Tukey’s post-hoc tests were performed to detect significance between each composite subgroups and t-test for subgroups. P values ≤ 0.05 are considered statistically significant in all tests.Results LED cured Tetric EvoCeram Bulkfill composite resin recorded higher B/T ratio than laser cured one and the difference in B/T ratio between both energies was statistically non-significant. LED cured Mosaic composite resin recorded higher B/T ratio than laser cured one. The difference in B/T ratio between both energies was statistically significant.Conclusion SIROLaser Blue laser device has been promoted for composite resin curing with different curing intervals, but the high cost and technique sensitivity result in their limited use. Clinical Significance: Different types of curing systems are present in the dental practice. The use of SIROLaser Blue laser to photopolymerize composite resin will offers proper polymerization properties.

scholarly journals Microhardness Assessment of Two Nanohybrid Composite Resins with Two Curing Technologies

2021 ◽  
Vol 9 (D) ◽  
pp. 81-86
Author(s):  
Ebaa Ibrahim Alagha ◽  
Mustafa Ibrahim Alagha
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Testing Machine ◽  
Degree Of Polymerization ◽  
Composite Resins ◽  
Blue Laser ◽  
Light Sources ◽  
Energy Effect ◽  
The Difference ◽  
Bottom To Top

AIM:This study evaluated the influence of two light sources on the microhardness of two recent composite resins. MATERIALS AND METHODS: A total of 120 specimens were prepared and divided into two groups according to the composite resin restoration used (Tetric EvoCeram Bulk fill) and (Universal Nanohybrid Mosaic). Each group was subdivided into four subgroups according to the curing sources used with different curing duration’s laser curing system (SIROLaser) for 10, 15, and 20 s and conventional blue light system (LED) for 20 s. A microhardness testing machine was used to assess the microhardness of Tetric EvoCeram Bulk fill and Universal Nanohybrid Mosaic. Two-way ANOVA statistical test was used for comparing resin composite and curing energy effect on different variable studied. One-way ANOVA followed by pair-wise Tukey’s post hoc tests was performed to detect significance between each composite subgroups and t-test for subgroups. P ≤ 0.05 is considered statistically significant in all tests. RESULTS: LED cured Tetric EvoCeram Bulk fill composite resin recorded higher bottom to top ratio (B/T ratio) than laser cured one and the difference in B/T ratio between both energies was statistically non-significant. LED cured Mosaic composite resin recorded higher B/T ratio than laser cured one . The difference in bottom to top ratio between both curing devices was statistically significant. CONCLUSION: SIROLaser Blue laser device increases the degree of polymerization and achieves better curing of composite resins than LED. RECOMMENDATION: Different types of curing systems are present in the dental practice. The use of SIROLaser Blue laser to photopolymerize composite resin will offers proper polymerization properties.

scholarly journals Effect of light sources on nanohardness, elastic modulus and water sorption of a composite resin

Polímeros ◽  
2011 ◽  
Vol 21 (2) ◽  
pp. 103-106
Author(s):  
Cristiane de O Juchem ◽  
Vicente C. B Leitune ◽  
Fabrício M Collares ◽  
Susana M. W Samuel
Keyword(s):  
Elastic Modulus ◽  
Light Source ◽  
Water Sorption ◽  
Composite Resin ◽  
Resin Composite ◽  
Pearson Correlation ◽  
Composite Resins ◽  
Light Sources ◽  
Steel Matrix ◽  
Strong Positive Relationship

The aim of this study was to evaluate the effect of a light source on nanohardness, elastic modulus, water sorption and solubility of a composite resin. Four curing units were used, three of which had an LED and another had a halogen source. The resin composite Z250 (3M ESPE) was used for all tests. For water sorption and solubility, five resin disks were made (15 mm in diameter and 1 mm thick), and these were polymerized for 20 seconds at nine different points (1 in the center and 8 around). For nanohardness and elastic modulus evaluation, 20 cylinders (5 for each group) were made with a bipartite steel matrix (6.0 mm diameter and 4.0 mm thick). The results of this study showed that the group polymerized with the Radii light-curing unit presented less water sorption than other curing units (p < 0.05). No statistical difference between units was found in nanohardness in 1mm-thick specimens. However, decreased nanohardness was shown at higher resin composite depth (p < 0.05). A Pearson correlation showed a strong positive relationship between nanohardness and elastic modulus for all groups and depths. The light source affects the water sorption, nanohardness and elastic modulus of composite resins.

Pulsed blue laser curing of hybrid composite resins

Biomaterials ◽  
1997 ◽  
Vol 18 (20) ◽  
pp. 1349-1354 ◽  
Author(s):  
Andrej Meniga ◽  
Zrinka Tarle ◽  
Mira Ristic ◽  
Jozo Sutalo ◽  
Goran Pichler
Keyword(s):  
Hybrid Composite ◽  
Composite Resins ◽  
Blue Laser ◽  
Laser Curing

scholarly journals Aplikasi klorheksidin glukonat 2%pada dentin tidak mempengaruhi kuat rekat geserkomposit resinyangmenggunakansistem adesif self etch (2% Chlorhexidine gluconate application on dentine does not affect bond strength of resin composite using self etch adhesive system)

2014 ◽  
Vol 13 (1) ◽  
pp. 7
Author(s):  
Dewi Puspitasari ◽  
Andi Soufyan ◽  
Ellyza Herda
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Testing Machine ◽  
Adhesive System ◽  
Chlorhexidine Gluconate ◽  
Adhesive Systems ◽  
Group I ◽  
Self Etch

Composite resin is a widely used aesthetic restoration. The restoration can fail due to secondary caries. Chlorhexidinegluconate 2% is used as a cavity disinfectant to eliminate microorganisms on the prepared cavity and to prevent thesecondary caries. The purpose of this study was to analyze the effect of chlorhexidine gluconate 2% to the bondstrength of composite resin with self etch system adhesive on dentine. Sixteen specimens of buccal dentine of premolarscrown are divided into 2 different groups. Group I: Clearfil SE Bond self-etch primer was applied for 20 seconds,Clearfil SE Bond bonding was applied for 5 seconds and polymerized for 10 seconds. Composite resin was constructedincrementally and polymerized for 20 seconds. Group II: prior to self etch primer application as in group I,chlorhexidine gluconate 2% was applied for 15 seconds. Shear bond strength was tested using Testing machine andanalyzed with unpaired T test. The highest shear bond strength was obtained by applying chlorhexidine gluconate 2%.The study concludes that chlorhexidine gluconate 2% application to dentine did not affect significantly to the bondstrength composite resin using self etch adhesive systems.

scholarly journals Application of different light sources for polymerization of restorative resins

2002 ◽  
Vol 49 (3-4) ◽  
pp. 95-100 ◽  
Author(s):  
Larisa Blazic ◽  
Slavoljub Zivkovic ◽  
Ivana Stojsin
Keyword(s):  
Blue Light ◽  
Composite Resin ◽  
Argon Laser ◽  
Light Sources ◽  
Plasma Arc ◽  
Light Curing ◽  
Long Life ◽  
Basic Characteristics ◽  
Resin Curing ◽  
Composite Restoration

The aim of this work was the introduction of the basic characteristics of contemporary polymerization light sources for composite resin curing. Two basic groups of available curing technologies are introduced. First are those that produce white light (conventional halogen lamps and plasma arc polymerization units). The second group comprises "blue light" curing devices that produce blue light at the origin of the light source. Lights belonging to this group include the blue LEDs and argon laser. Information about main characteristics of light sources (irradiance, wavelength range) and their proper choice could have a significant impact on polymerization quality and on long-life of composite restoration.

scholarly journals Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins

2013 ◽  
Vol 14 (6) ◽  
pp. 1137-1144 ◽  
Author(s):  
Hideaki Kyoizumi ◽  
Junji Yamada ◽  
Toshimitsu Suzuki ◽  
Masafumi Kanehira ◽  
Werner J Finger ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Minor Effect ◽  
Wear Depth ◽  
Glass Fillers ◽  
Glass Filler ◽  
Representative Samples

ABSTRACT Aim To investigate and compare the effects of toothbrushes with different hardness on abrasion and surface roughness of composite resins. Materials and methods Toothbrushes (DENT. EX Slimhead II 33, Lion Dental Products Co. Ltd., Tokyo, Japan) marked as soft, medium and hard, were used to brush 10 beam-shaped specimens of each of three composites resins (Venus [VEN], Venus Diamond [VED] and Venus Pearl [VEP]; HeraeusKulzer) with standardized calcium carbonate slurry in a multistation testing machine (2N load, 60 Hz). After each of five cycles with 10k brushing strokes the wear depth and surface roughness of the specimens were determined. After completion of 50k strokes representative samples were inspected by SEM. Data were treated with ANOVA and regression analyses (p < 0.05). Results Abrasion of the composite resins increased linearly with increasing number of brushing cycles (r2 > 0.9). Highest wear was recorded for VEN, lowest for VED. Hard brushes produced significantly higher wear on VEN and VEP, whereas no difference in wear by toothbrush type was detected for VED. Significantly highest surface roughness was found on VED specimens (Ra > 1.5 μm), the lowest one on VEN (Ra < 0.3 μm). VEN specimens showed increased numbers of pinhole defects when brushed with hard toothbrushes, surfaces of VEP were uniformly abraded without level differences between the prepolymerized fillers and the glass filler-loaded matrix, VED showed large glass fillers protruding over the main filler-loaded matrix portion under each condition. Conclusion Abrasion and surface roughness of composite resins produced by toothbrushing with dentifrice depend mainly on the type of restorative resin. Hardness grades of toothbrushes have minor effects only on abrasion and surface roughness of composite resins. No relationship was found between abrasion and surface roughness. Clinical significance The grade of the toothbrush used has minor effect on wear, texture and roughness of the composite resin. How to cite this article Kyoizumi H, Yamada J, Suzuki T, Kanehira M, Finger WJ, Sasaki K. Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins. J Contemp Dent Pract 2013;14(6):1137-1144.

scholarly journals Perbedaan Kekuatan Geser Reparasi Gigi Tiruan Cekat dengan Resin Komposit Packable dan Flowable (Uji Laboratoris pada permukaan logam NiCr)

2012 ◽  
Vol 19 (2) ◽  
pp. 102
Author(s):  
Endang Wahyuningtyas ◽  
Suparyono Saleh ◽  
Sri Budi Barunawati
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Distilled Water ◽  
Research Subjects ◽  
Flowable Composite ◽  
Diamond Bur ◽  
Universal Testing

Latar Belakang. Resin komposit merupakan bahan pilihan untuk reparasi Gigi Tiruan Cekat porcelain fused to metal (PFM) Karena estetis baik dan manipulasi mudah. Tujuan penelitian ini adalah mengetahui perbedaan kekuatan geser perlekatan resin komposit pada permukaan logam Gigi Tiruan Cekat dengan menggunakan resin komposit jenis packable dan jenis flowable. Metode penelitian. Subjek penelitian berupa logam NiCr (Noritake, Japan) berbentuk silinder dengan diameter 10 mm dan tinggi 3 mm. Penelitian dibagi menjadi dua kelompok, masing-masing terdiri dari 10 subjek. Kelompok pertama reparasi dengan resin komposit packable (Z250™ 3M ESPE, USA) dan kelompok kedua reparasi dengan resin komposit flowable (Dyad flow, Kerr, USA). Permukaan subjek dikasari dengan wheel diamond bur, dietsa dengan asam fosfat 37 % (Scotchbond™, 3M ESPE, USA) kemudian dicuci dan dikeringkan, selanjutnya diaplikasikan silan (Rely X™ Ceramic Primer, 3M ESPE, USA) dan bonding (Adper™ Single Bond, 3M ESPE, USA). Permukaan kemudian dilapisi dengan resin komposit packable dan flowable, disinari selama 40 detik. Subjek penelitian direndam di dalam distilled water dan dimasukkan ke dalam incubator dengan suhu 37°C selama 7 hari. Uji kekuatan geser dilakukan dengan menggunakan Universal Testing Machine. Data dianalisis dengan uji t. hasil uji t menunjukkan terdapat perbedaan bermakna kekuatan geser reparasi gigi tiruan cekat pada permukaan logam (p<0,05). Kesimpulan penelitian ini adalah kekuatan geser reparasi pada permukaan logam dengan menggunakan resin komposit flowable yang mengandung bahan coupling agent lebih tinggi dibandingkan reparasi pada permukaan porselen dengan menggunakan resin komposit packable. Background. One of selected material by repairing the fixed partial denture was composite resin because of its good aesthetics and low manipulation. The aim. This research was aimed at identifying the differences of shear bond strength of composite resin on metal surface by using different composite resins, namely packable and flowable composite resins. Method. The research subjects were cylinders with 10 mm in diameter and 3 mm in height. The research subjects with metal material of NiCr (Noritke, Japan) involved two groups. The first group comprising 10 repair subjects with composite packable (Z250™, 3M ESPE, USA) and 10 repair subjects with flowable composite (Dyad flow, Kerr, USA). The surface of the subjects were roughned with wheel diamond bur and etched with 37% phosphate acid (Scotbond™, 3M ESPE, USA) were applied. The surface was then coated with packable and flowable composite resins and light-cured for 40 seconds. The research subjects were immersed in distilled water and put into the incubator at temperature of 37°C for 7 days. The shear bond strength test was conducted using the Universal Testing Machine. Data were analyzed using t-test. The result. The research result showed that there were differences of shear bond strength of repair between packable and flowable composite resins. The result of t-test indicated significant diffrences on metal surface (p<0,05). The conclusion of this research is that shear bond strength of repair with flowable composite which contain coupling agent has higher shear bond strength than that of packable composite resin.

Impact of the Porosity from Incremental and Bulk Resin Composite Filling Techniques on the Biomechanical Performance of Root-Treated Molars

2021 ◽  
Author(s):  
RAS Pereira ◽  
PBF Soares ◽  
AA Bicalho ◽  
LM Barcelos ◽  
LRS Oliveira ◽  
...  
Keyword(s):  
Fracture Mode ◽  
Fracture Resistance ◽  
Composite Resin ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Pulp Chamber ◽  
Ionomer Cement

SUMMARY Objectives: To analyze the effect of the porosity caused by incremental and bulk resin composite filling techniques using low- and high-viscosity composite resins on the biomechanical performance of root-treated molars. Methods: Forty intact molars received standardized mesio-occlusal-distal (MOD) cavity preparation, were root treated, and randomly divided into four groups with different filling techniques (n=10). The first involved two incremental filling techniques using VIT/Z350XT, a nanofilled composite resin (Filtek Z350XT, 3M ESPE) associated with a resinmodified glass ionomer cement, and resin-modified glass ionomer cement (RMGIC; Vitremer, 3M ESPE) for filling the pulp chamber. The second involved TPH/VIT, a microhybrid composite resin TPH3 Spectrum associated with Vitremer. The third and fourth involved two bulk-fill composite resins: SDR/TPH, a low-viscosity resin composite (Surefill SDR flow, Dentsply) associated with TPH3 Spectrum, and POST, a high-viscosity bulkfill resin composite (Filtek Bulk Fill Posterior, 3M ESPE). The volume of the porosity inside the restoration was calculated by micro-CT. The cusp deformation caused by polymerization shrinkage was calculated using the strain-gauge and micro-CT methods. The cusp deformation was also calculated during 100 N occlusal loading and loading to fracture. The fracture resistance and fracture mode were recorded. Data were analyzed by one-way analysis of variance and Tukey test. The fracture mode was analyzed by the χ2 test. The volume of the porosity was correlated with the cusp deformation, fracture resistance, and fracture mode (α=0.05). Results: Incremental filling techniques associated with RMGIC resulted in a significantly higher porosity than that of both bulk-fill techniques. However, no significant difference was found among the groups for the fracture resistance, fracture mode, and cusp deformation, regardless of the measurement time and method used. No correlation was observed between the volume of the porosity and all tested parameters. Conclusions: The porosity of the restorations had no influence on the cuspal deformation, fracture resistance, or fracture mode. The use of the RMGIC for filling the pulp chamber associated with incremental composite resins resulted in similar biomechanical performance to that of the flowable or regular paste bulk-fill composite resin restorations of root-treated molars.

The Effect of Finishing and Polishing Procedures on the Surface Roughness of Composite Resin Materials

2007 ◽  
Vol 8 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Nuray Attar
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Resin Composite ◽  
Composite Resins ◽  
Control Group ◽  
Surface Groups ◽  
Average Roughness ◽  
Strip Surface ◽  
Polishing Procedures ◽  
Surface Sealant

Abstract Aims The aims of this study were to evaluate the effect of various finishing and polishing procedures on the surface roughness of six different composite resin materials (Artemis Enamel, TPH Spectrum, Filtek A–110, Filtek Supreme Enamel, Solitaire 2, and Filtek P–60) as well as to evaluate the effectiveness of the surface sealant application (BisCover) on the surface roughness after finishing and polishing procedures of tested composites. Methods and Materials Specimens (n=168) measuring 5 mm in diameter x 2 mm in thickness were fabricated in a plexiglass well covered with a Mylar strip using six composite resins. A control group of seven specimens of each material received no polishing after being cured under the Mylar strip. Twenty-one specimens for each composite were randomly divided among three finishing and polishing groups (n=7). Each group was polished using a different system: Carbide bur/Sof-Lex disc, Carbide bur/Enhance disc with polishing paste, and Carbide bur/Edenta composite finishing kit. The average surface roughness (Ra, ìm) of the control and treated specimens were measured with the Mitutoyo Surftest–402 Surface Roughness tester. After a surface sealant (BisCover) was applied to all treated specimens, according to manufacturer's instructions, the average roughness (Ra) was measured again. Results were statistically analyzed using analysis of variance (ANOVA) and the post-hoc Scheffe's test at a p<0.05 significance level. Results Significant differences were found for the surface roughness (p<0.05) with interaction among composite resins and the finishing systems used (p<0.05). Enhance/Biscover finishing and polishing procedure surface was not significantly different from the Mylar strip surface groups (p>0.05). The Mylar strip group was not significantly different from the Sof-Lex/BisCover and Edenta/BisCover groups. The ranking of mean Ra values by materials was as follows: Filtek Supreme Enamel < Filtek A110 < TPH Spectrum < Artemis <Filtek P–60 < Solitaire 2. The ranking of mean Ra values by polishing systems was as follows: Enhance/BisCover < Mylar Strip < Sof-Lex/BisCover < Edenta/BisCover < Sof-Lex < Enhance < Edenta. Conclusion Smoother surfaces were recorded for the Enhance/BisCover and the Mylar strip-formed surface groups. The composite finishing kit Edenta significantly increased the Ra for all tested composites (p<0.05). But after finishing with Edenta, the use of a surface sealant (BisCover) significantly improved the surface smoothness of all tested composites (p<0.05). Use of BisCover surface sealant on anterior and posterior resin composite restorations after finishing and polishing procedures is recommended. Citation Attar N. The Effect of Finishing and Polishing Procedures on the Surface Roughness of Composite Resin Materials. J Contemp Dent Pract 2007 January;(8)1:027-035.

scholarly journals Comparison of silorane and methacrylate-based composite resins on the curing light transmission

2010 ◽  
Vol 21 (6) ◽  
pp. 538-542 ◽  
Author(s):  
Ricardo Danil Guiraldo ◽  
Simonides Consani ◽  
Rafael Leonardo Xediek Consani ◽  
Sandrine Bittencourt Berger ◽  
Wilson Batista Mendes ◽  
...  
Keyword(s):  
Composite Resin ◽  
Light Transmission ◽  
Knoop Hardness ◽  
Composite Resins ◽  
Power Meter ◽  
Light Curing ◽  
Curing Light ◽  
The Mean ◽  
Spectral Distributions ◽  
The Difference

The aim of this study was to investigate the influence of different composite resins - Filtek P90 (silorane-based composite) and Heliomolar (methacrylate-based composite) - on light transmission and decrease in Knoop hardness between the bottom and top of cured specimens. The irradiance of a light-curing unit (LCU) was measured with a power meter (Ophir Optronics; 900 mw/cm2) and spectral distributions were obtained using a spectrometer (USB 2000). Twenty standardized cylindrical specimens (2 mm thick x 7 mm diameter) of each composite resin were obtained by curing using the LCU for 40 s. Light energy transmission through the composite was calculated (n=10). The Knoop hardness number for each surface was recorded as the mean of 3 indentations. The difference in Knoop hardness between the top and bottom (DKH) of the same specimen was calculated (n=10). The irradiance of light that passed through Filtek P90 (272 mW/cm2) was not significantly greater than that the passed through Heliomolar (271 mW/cm2). The DKH of Filtek P90 (25%) was significantly higher than that of Heliomolar (12%). There was a greater degree of subsurface polymerization of the methacrylate-based composite compared to the silorane-based composite.

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