The effects of extended curing time and radiant energy on microhardness and temperature rise of conventional and bulk-fill resin composites

2019 ◽  
Vol 23 (10) ◽  
pp. 3777-3788 ◽  
Author(s):  
Matej Par ◽  
Igor Repusic ◽  
Hrvoje Skenderovic ◽  
Ognjen Milat ◽  
Jelena Spajic ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Radiant Energy ◽  
Resin Composites ◽  
Curing Time

Effect of Shortened Light-Curing Modes on Bulk-Fill Resin Composites

2020 ◽  
Vol 45 (5) ◽  
pp. 496-505
Author(s):  
CS Sampaio ◽  
PG Pizarro ◽  
PJ Atria ◽  
R Hirata ◽  
M Giannini ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Light Output ◽  
High Mode ◽  
Resin Composites ◽  
Curing Time ◽  
Micro Computed Tomography ◽  
Polymerization Shrinkage ◽  
Light Curing

Clinical Relevance Shortened light curing does not affect volumetric polymerization shrinkage or cohesive tensile strength but negatively affects the shear bond strength of some bulk-fill resin composites. When performing shortened light curing, clinicians should be aware of the light output of their light-curing units. SUMMARY Purpose: To evaluate volumetric polymerization shrinkage (VPS), shear bond strength (SBS) to dentin, and cohesive tensile strength (CTS) of bulk-fill resin composites (BFRCs) light activated by different modes. Methods and Materials: Six groups were evaluated: Tetric EvoCeram bulk fill + high mode (10 seconds; TEC H10), Tetric EvoFlow bulk fill + high mode (TEF H10), experimental bulk fill + high mode (TEE H10), Tetric EvoCeram bulk fill + turbo mode (five seconds; TEC T5), Tetric EvoFlow bulk fill + turbo mode (TEF T5), and experimental bulk fill + turbo mode (TEE T5). Bluephase Style 20i and Adhese Universal Vivapen were used for all groups. All BFRC samples were built up on human molar bur-prepared occlusal cavities. VPS% and location were evaluated through micro–computed tomography. SBS and CTS tests were performed 24 hours after storage or after 5000 thermal cycles; fracture mode was analyzed for SBS. Results: Both TEC H10 and TEE H10 presented lower VPS% than TEF H10. However, no significant differences were observed with the turbo-curing mode. No differences were observed for the same BFRC within curing modes. Occlusal shrinkage was mostly observed. Regarding SBS, thermal cycling (TC) affected all groups. Without TC, all groups showed higher SBS values for high mode than turbo mode, while with TC, only TEC showed decreased SBS from high mode to turbo modes; modes of fracture were predominantly adhesive. For CTS, TC affected all groups except TEE H10. In general, no differences were observed between groups when comparing the curing modes. Conclusions: Increased light output with a shortened curing time did not jeopardize the VPS and SBS properties of the BFRCs, although a decreased SBS was observed in some groups. TEE generally showed similar or improved values for the tested properties in a shortened light-curing time. The VPS was mostly affected by the materials tested, whereas the SBS was affected by the materials, curing modes, and TC. The CTS was not affected by the curing modes.

scholarly journals Effects of Light Curing Modes and Resin Composites on Temperature Rise under Human Dentin: An in vitro Study

2008 ◽  
Vol 27 (4) ◽  
pp. 581-589 ◽  
Author(s):  
Ihsan HUBBEZOGLU ◽  
Arife DOGAN ◽  
Orhan Murat DOGAN ◽  
Giray BOLAYIR ◽  
Bulent BEK
Keyword(s):  
Temperature Rise ◽  
In Vitro Study ◽  
Vitro Study ◽  
Resin Composites ◽  
Human Dentin ◽  
Light Curing

scholarly journals Influence of Bulk-Fill Composites, Polimerization Modes, and Remaining Dentin Thickness on Intrapulpal Temperature Rise

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Serdar Akarsu ◽  
Sultan Aktuğ Karademir
Keyword(s):  
Temperature Rise ◽  
Variance Analysis ◽  
Resin Composites ◽  
Application Time ◽  
Led Light ◽  
Low Viscosity ◽  
Single Tooth ◽  
Light Curing ◽  
Dentin Thickness

Objectives. The aim of this study was to compare the effects of different bulk-fill resin composites, polimerization modes, and the thickness of remaining dentin on the increase of intrapulpal temperature. Methods. Human-extracted upper premolar teeth (n = 10) were used to design a single-tooth model with remaining dentin thicknesses of 1 mm and 0.5 mm. Estelite Bulk-fill Flow (Tokuyama, Japan), Surefil SDR™ Flow (Dentsply Caulk, Brazil), Filtek Bulk-Fill Posterior (3M, USA), and SonicFill™ 2 Bulk-fill (Kerr, USA) composites were applied according to the manufacturer’s instructions. The standard and high modes of a light emitted diode (LED) light curing unit (LCU) (VALO™ Utradent, USA), were used for polymerization. In order to mimic the in vivo conditions of pulpal circulation, digital flowmetry (SK-600II, SK Medical, China) was used. Intrapulpal temperature rise was measured using K type thermocoupling (CEM DT 610B, Robosem Engineering, China). Data were analyzed using three-way variance analysis (ANOVA) and the independent t-test. Results. No significant statistical differences in intrapulpal temperature rise between low viscosity bulk-fill composites (SDR and Estelite) were found. The lowest intrapulpal temperature rise was found in groups which used the Filtek Bulk-fill composite. Decreases in the remaining dentin thickness increased the intrapulpal temperature rise. Significance. This study demonstrated that remaining dentin thickness, filler ratio of bulk-fill composites, and power and application time of the LED-LCU may affect intrapulpal temperature rise.

scholarly journals Influence of increment thickness on radiant energy and microhardness of bulk-fill resin composites

2018 ◽  
Vol 37 (2) ◽  
pp. 206-213 ◽  
Author(s):  
Gamze KARACOLAK ◽  
L. Sebnem TURKUN ◽  
Hayal BOYACIOGLU ◽  
Jack L. FERRACANE
Keyword(s):  
Radiant Energy ◽  
Resin Composites

scholarly journals The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites

2012 ◽  
Vol 13 (4) ◽  
pp. 472-475 ◽  
Author(s):  
Arash Poorsattar Bejeh Mir ◽  
Morvarid Poorsattar Bejeh Mir
Keyword(s):  
Color Change ◽  
Central Zone ◽  
Resin Composites ◽  
Curing Time ◽  
Tooth Color ◽  
System Equation ◽  
Color Changes ◽  
Light Curing ◽  
Color Alteration ◽  
Clinically Significant

ABSTRACT Aim Light curing of resin composites may considerably change the color of resin composites. The aim of this study was to evaluate the changing pattern of resin composite's color by different curing times. Materials and methods Fifteen, 1 mm-thick, samples of each A2 shade Clearfill and Filtek P60 composites were prepared. First five samples were cured for 10s (400 mW/cm2) in each pole of the rectangular samples (right upper, right lower, left lower, left upper plus central zone). Consecutive sets of samples, each consists of five, were irradiated by doubling and tripling the curing time to 20 and 30s. Color change were measured by means of CIE 1976 L*a*b system equation (ΔE) for each digitalized picture of the corresponding sample. Results Color of samples was clinically significant changed by increasing the curing time from 10 to 20s and from 20 to 30s for Clearfil (ΔE = 13.86 and 14.11 respectively,) and Filtek P60 (ΔE = 7.68 and 11.66 respectively). The ‘b’ component change was responsible for the most color alteration confirmed by the linear regression model (p < 0.001). Conclusion This study revealed the contrasting pattern of resin composite's color change with the different curing times. Our findings support that light curing is accompanied by a higher attained blue chroma and diminished yellowness of resin composites. Clinical significance A complete and proper curing of sample resin composites on buccal surface of particular tooth, as a common practice to ensure the maximize concordance composite and tooth color, is reassured according to the considerable differences of undercured and overcured in comparison to normocured composite. How to cite this article Poorsattar Bejeh Mir A, Poorsattar Bejeh Mir M. The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites. J Contemp Dent Pract 2012;13(4):472-475.

scholarly journals Evaluation of Two Resin Composites Having Different Matrix Compositions

2020 ◽  
Vol 8 (3) ◽  
pp. 76
Author(s):  
Tarek M. Elshazly ◽  
Christoph Bourauel ◽  
Dalia I. Sherief ◽  
Dalia I. El-Korashy
Keyword(s):  
Vickers Microhardness ◽  
Resin Composite ◽  
Blue Dye ◽  
Resin Composites ◽  
Methylene Blue Dye ◽  
Curing Time ◽  
Micro Computed Tomography ◽  
Time Data ◽  
Polymerization Shrinkage ◽  
Dye Penetration

This study compared two resin composites with similar filler systems and different matrix compositions. The depth of cure (DoC), polymerization shrinkage, and marginal leakage were evaluated. A Filtek Bulk Fill resin composite (FB) and a Filtek Supreme resin composite (FS) were used. For the DoC and polymerization shrinkage, cylindrical specimens with different thicknesses were prepared. The DoC was attributed to the bottom/top ratios of Vickers microhardness numbers. For polymerization shrinkage, each specimen was firstly scanned using micro-computed tomography (µCT) then cured for 20 s, then for 10 s, and then for 10 s, and they were rescanned between each curing time. Data were processed using the Mimics software. For marginal leakage, standardized 5 mm cavities were prepared in 90 molars. After etching and bonding, materials were packed according to groups: FB-bulk, FB-incremental, and FS-incremental, which were cured for 20, 30, and 40 s, respectively. After thermo-cycling, teeth were stored in 1% methylene blue dye for 24 h and then sectioned and observed for dye penetration. The results showed insignificant differences in the shrinkage and leakage between the different packing techniques and curing times of both materials. In conclusion, the introduction of a novel matrix into resin composite composition enabled bulk-filling in one layer up to 5 mm deep while keeping a tolerable polymerization shrinkage.

scholarly journals Effects of Color Modifier on Degree of Monomer Conversion, Biaxial Flexural Strength, Surface Microhardness, and Water Sorption/Solubility of Resin Composites

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3902
Author(s):  
Pipop Saikaew ◽  
Patchara Phimolthares ◽  
Pheeratas Phitakthanaakul ◽  
Panthira Sirikul ◽  
Suwannee Mekrakseree ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Water Sorption ◽  
Resin Composite ◽  
Physical And Mechanical Properties ◽  
Monomer Conversion ◽  
Resin Composites ◽  
Curing Time ◽  
Surface Microhardness ◽  
Biaxial Flexural Strength ◽  
Group 1

Color modifiers can be mixed with resin composites to mimic the shade of severely discolored tooth. The aim of this study was to assess the effects of a color modifier on the physical and mechanical properties of a resin composite. The composite was mixed with a color modifier at 0 wt% (group 1), 1 wt% (group 2), 2.5 wt% (group 3), or 5 wt% (group 4). The degree of monomer conversion (DC) was examined after light curing for 20 or 40 s. Biaxial flexural strength (BFS)/modulus (BFM), surface microhardness (SH), and water sorption (Wsp)/solubility (Wsl) were also tested. The DC of group 1 was significantly higher than that of groups 3 and 4. The increase in curing time from 20 to 40 s increased the DC by ~10%. The BFS, BFM, Wsp, and Wsl of all the groups were comparable. A negative correlation was detected between the concentration of color modifier and the BFS and DC, while a positive correlation was observed with Wsp. In conclusion, the color modifier reduced the DC of composites, but the conversion was improved by extending the curing time. The increase in color modifier concentration also correlated with a reduction in strength and the increase in the water sorption of the composites.

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