scholarly journals Influence of Tip Diameter and Light Spectrum of Curing Units on the Properties of Bulk-Fill Resin Composites

2021 ◽  
Author(s):  
Igor Oliveiros Cardoso ◽  
Alexandre Coelho Machado ◽  
Luísa de Oliveira Fernandes ◽  
Paulo Vinícius Soares ◽  
Luís Henrique Araújo Raposo
Keyword(s):  
Fourier Transform ◽  
Resin Composite ◽  
Knoop Hardness ◽  
Specimen Preparation ◽  
Resin Composites ◽  
Light Spectrum ◽  
Specimen Diameter ◽  
Light Spectra ◽  
Light Curing ◽  
The Fourier Transform

Abstract Objective The aim of this study was to evaluate the influence of different light-curing units (LCUs) with distinct tip diameters and light spectra for activating bulk-fill resins. Materials and Methods The specimens (n = 10) were made from a conventional composite (Amaris, VOCO) and bulk-fill resins (Aura Bulk Fill, SDI; Filtek One, 3M ESPE; Tetric Bulk Fill, Ivoclar Vivadent) with two diameters, 7 or 10 mm, × 2 mm thickness. Following 24 hours of specimen preparation, the degree of conversion (DC) was evaluated using the Fourier-transform infrared unit. Knoop hardness (KHN) readings were performed on the center and periphery of the specimens. Data were assessed for homoscedasticity and submitted to one-way and three-way analysis of variance followed by the Tukey's and Dunnett's tests, depending on the analysis performed (α = 0.05). Results LCUs and specimen diameter significantly affected the DC. The Tetric Bulk Fill provided increased DC results when light-cured with Valo (54.8 and 53.5%, for 7 and 10 mm, respectively) compared with Radii Xpert (52.1 and 52.9%, for 7 and 10 mm, respectively). No significant differences in KHN results were noted for the conventional resin composite (Amaris) compared with LCUs (p = 0.213) or disc diameters (p = 0.587), but the center of the specimen exhibited superior KHN (p ≤ 0.001) than the periphery. Conclusion The light spectrum of the multipeak LCU (Valo) significantly increased the DC and KHN of the bulk-fill resin composite with additional initiator to camphorquinone (Tetric Bulk Fill) compared with the monowave LCU (Radii Xpert). The tip size of the LCUs influenced the performance of some of the resin composites tested.

scholarly journals Characterization of Experimental Short-Fiber-Reinforced Dual-Cure Core Build-Up Resin Composites

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2281
Author(s):  
Eija Säilynoja ◽  
Sufyan Garoushi ◽  
Pekka K. Vallittu ◽  
Lippo Lassila
Keyword(s):  
Fracture Toughness ◽  
Resin Composite ◽  
Rotating Disk ◽  
Monomer Conversion ◽  
Short Fiber ◽  
Flexural Properties ◽  
Resin Composites ◽  
Fiber Reinforced ◽  
Three Point Bending ◽  
Light Curing

As a core build-up material, dual-cured (DC) resin-based composites are becoming popular. The aim of this research was to investigate specific physical and handling properties of new experimental short-fiber-reinforced DC resin composites (SFRCs) in comparison to different commercial, conventional DC materials (e.g., Gradia Core, Rebilda DC, LuxaCore Z, and Visalys® CemCore). Degree of monomer conversion (DC%) was determined by FTIR-spectrometry using either self- or light-curing mode. The flexural strength, modulus, and fracture toughness were calculated through a three-point bending setup. Viscosity was analyzed at room (22 °C) and mouth (35 °C) temperatures with a rotating disk rheometer. The surface microstructure of each resin composite was examined with scanning electron microscopy (SEM). Data were statistically analyzed with analysis of variance ANOVA (p = 0.05). The curing mode showed significant (p < 0.05) effect on the DC% and flexural properties of tested DC resin composites and differences were material dependent. SFRC exhibited the highest fracture toughness (2.3 MPa m1/2) values and LuxaCore showed the lowest values (1 MPa m1/2) among the tested materials (p < 0.05). After light curing, Gradia Core and SFRCs showed the highest flexural properties (p < 0.05), while the other resin composites had comparable values. The novel DC short-fiber-reinforced core build-up resin composite demonstrated super fracture toughness compared to the tested DC conventional resin composites.

scholarly journals Printable and Machinable Dental Restorative Composites for CAD/CAM Application—Comparison of Mechanical Properties, Fractographic, Texture and Fractal Dimension Analysis

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4919
Author(s):  
Wojciech Grzebieluch ◽  
Piotr Kowalewski ◽  
Dominika Grygier ◽  
Małgorzata Rutkowska-Gorczyca ◽  
Marcin Kozakiewicz ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Resin Composite ◽  
Flexural Modulus ◽  
Optical Microscope ◽  
Resin Composites ◽  
Three Point Bending ◽  
Dimension Analysis ◽  
Cad Cam ◽  
Light Curing ◽  
Fractal Dimension Analysis

Thanks to the continuous development of light-curing resin composites it is now possible to print permanent single-tooth restorations. The purpose of this study was to compare resin composites for milling -Gandio Blocks(GR), Brilliant Crios(CR) and Enamic(EN) with resin composite for 3D printing—VarseoSmileCrown plus(VSC). Three-point bending was used to measure flexural strength (σf) and flexural modulus (Ef). The microhardness was measured using a Vickers method, while fractographic, microstructural, texture and fractal dimension (FD) analyses were performed using SEM, optical microscope and picture analysis methods. The values of σf ranged from 118.96 (±2.81) MPa for EN to 186.02 (±10.49) MPa for GR, and the values of Ef ranged from 4.37 (±0.8) GPa for VSC to 28.55 (±0.34) GPa for EN. HV01 ranged from 25.8 (±0.7) for VSC to 273.42 (±27.11) for EN. The filler content ranged from 19–24 vol. % for VSC to 70–80 vol. % for GR and EN. The observed fractures are typical for brittle materials. The correlation between FD of materials microstructure and Ef was observed. σf of the printed resin depends on layers orientation and is significantly lower than σf of GR and CR. Ef of the printed material is significantly lower than Ef of blocks for milling.

Effect of Pre-heating Resin Composite on Restoration Microleakage

10.2341/07-41 ◽  
2008 ◽  
Vol 33 (1) ◽  
pp. 72-78 ◽  
Author(s):  
W. C. Wagner ◽  
M. N. Aksu ◽  
A. L. Neme ◽  
J. B. Linger ◽  
F. E. Pink ◽  
...  
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Resin Composites ◽  
Tooth Structure ◽  
Positive Effects ◽  
Light Curing

Clinical Relevance The results of this study indicate that preheating composites can improve adaptation of resin composites to tooth structure. This technique significantly reduced microleakage. However, delaying light curing of the preheated composite after placement appears to be counterproductive and diminishes the positive effects from the preheating treatment. Flowable liner was less effective than preheating the composite in reducing microleakage.

The Effect of Curing Units and Staining Solutions on the Color Stability of Resin Composites

10.2341/07-3 ◽  
2007 ◽  
Vol 32 (6) ◽  
pp. 616-622 ◽  
Author(s):  
A. R. Yazici ◽  
Ç Çelik ◽  
B. Dayangaç ◽  
G. Özgünaltay
Keyword(s):  
Clinical Relevance ◽  
Immersion Time ◽  
Resin Composite ◽  
Color Stability ◽  
Time Dependent ◽  
Resin Composites ◽  
Color Changes ◽  
Light Curing

Clinical Relevance The color stability of resin composites did not vary based on the type of light curing unit. The effect of staining solutions on color changes in resin composites was resin composite and immersion time-dependent.

scholarly journals The Effect of Irradiation Distance on Microhardness of Resin Composites Cured with Different Light Curing Units

2010 ◽  
Vol 04 (04) ◽  
pp. 440-446 ◽  
Author(s):  
Isil Cekic-Nagas ◽  
Ferhan Egilmez ◽  
Gulfem Ergun
Keyword(s):  
Light Emitting Diode ◽  
Resin Composite ◽  
Composite Layer ◽  
Hardness Test ◽  
Resin Composites ◽  
Plasma Arc ◽  
Light Emitting ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Light Curing

Objectives: The aim of this study was to compare the microhardness of five different resin composites at different irradiation distances (2 mm and 9 mm) by using three light curing units (quartz tungsten halogen, light emitting diodes and plasma arc).Methods: A total of 210 disc-shaped samples (2 mm height and 6 mm diameter) were prepared from different resin composites (Simile, Aelite Aesthetic Enamel, Clearfil AP-X, Grandio caps and Filtek Z250). Photoactivation was performed by using quartz tungsten halogen, light emitting diode and plasma arc curing units at two irradiation distances (2 mm and 9 mm). Then the samples (n=7/ per group) were stored dry in dark at 37°C for 24 h. The Vickers hardness test was performed on the resin composite layer with a microhardness tester (Shimadzu HMV). Data were statistically analyzed using nonparametric Kruskal Wallis and Mann-Whitney U tests.Results: Statistical analysis revealed that the resin composite groups, the type of the light curing units and the irradiation distances have significant effects on the microhardness values (P<.05).Conclusions: Light curing unit and irradiation distance are important factors to be considered for obtaining adequate microhardness of different resin composite groups. (Eur J Dent 2010;4:440-446)

scholarly journals Reaction of Rat Subcutaneous Connective Tissue to Resin Composites Polymerized with Different Light Curing Units and Different Lightening Methods

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Atiyeh Feiz ◽  
Farahnaz Arbabzadeh Zavareh ◽  
Seyed Mohammad Razavi ◽  
Hamid Badrian ◽  
Sepideh Dolatyar ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Resin Composite ◽  
Control Group ◽  
Albino Rats ◽  
Resin Composites ◽  
Significant Difference ◽  
Light Curing ◽  
Full Power ◽  
Subcutaneous Connective Tissue

The aim of the study was to determine and compare the reaction of rat subcutaneous connective tissue to resin composites polymerized with different lights curing and lightening methods. In this in vivo study, 20 mature Wister Albino rats were used. The composite discs, 4 mm in diameter and 2 mm thick, were cured by QTH or LED light curing units with 4 different lightning methods (full power QTH, full power LED, pulse LED, and ramp LED). Five resin composite discs were implanted in each rat, so that 4 of 5 discs for implantation of cured composite discs differently and central one as control without implantation. After sacrificing at 7, 14, 30, and 60 days the inflammatory grade, fibrosis, and necrosis were determined. Freedman and Cochran tests were used to analyze the data using SPSS software ver. 15. The results of the study showed significant differences in inflammation grade and fibrosis among control group and 4 experimental groups at day 14 (P<0.05). In necrosis, there was no significant difference among 4 groups in different times (P>0.05). In conclusion, neither the type of light curing units (LED or QTH) nor the lightening methods can affect the grade of inflammatory reaction.

scholarly journals Effect of different light curing units on Knoop hardness and temperature of resin composite

2009 ◽  
Vol 20 (3) ◽  
pp. 308
Author(s):  
RicardoDanil Guiraldo ◽  
Simonides Consani ◽  
RafaelLeonardo Xediek Consani ◽  
WilsonBatista Mendes ◽  
Thais Lympius ◽  
...  
Keyword(s):  
Resin Composite ◽  
Knoop Hardness ◽  
Light Curing

scholarly journals Influence of curing duration and mixing techniques of bulk fill resin composites on bi-axial flexural strength and degree of conversion

2020 ◽  
Vol 18 ◽  
pp. 228080002097572
Author(s):  
Thamer Almohareb ◽  
Abdulaziz A Alayed ◽  
Khalid M. Alzahrani ◽  
Ahmed M Maawadh ◽  
Basil Almutairi ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Flexural Strength ◽  
Statistical Data ◽  
Resin Composite ◽  
Degree Of Conversion ◽  
Resin Composites ◽  
Photo Polymerization ◽  
Biaxial Flexural Strength ◽  
Curing Methods ◽  
Mixing Techniques

Objectives: The aim was to assess the influence of polymerization duration, method and resin manipulation techniques on the biaxial flexural strength (BFS) and degree of conversion (DC) of bulk fill resin composites (BFRC). Methods: One hundred and eighty disc specimens were fabricated using MultiCore (MC) and Core-It (CI) bulk fill resin composite. Each material group, specimens were divided into nine subgroups based on curing methods (Light cure for 10 and 20 s; and auto-cure) and mixing techniques (first auto-mix, second automix, and hand mix). BFS was tested with a ball indenter at a crosshead speed of 0.50 mm/min. DC was assessed for MC and CI materials for 10 s and 20 s light cure; and auto cure specimens using Fourier Transform-Infrared Spectroscopy (FTIR). Statistical data comparisons were performed using ANOVA, Bonferroni and Tukey-Kramer tests. Results: For MC and CI, BFS was highest in 10 s light cure specimens, however comparable to specimens cured for 20 s ( p > 0.05). Auto cure specimens showed lower BFS than light cured samples for both materials ( p < 0.05). Hand mixed specimens showed significantly compromised BFS compared to automix technique for MC and CI. DC % was comparable for 10 s and 20 s light cure methods for both materials ( p > 0.05), which was higher than DC % of auto cure bulk fill resins ( p < 0.05). CI showed higher DC % and BFS compared to MC bulk fill resin composite. Conclusion: Photo-polymerization duration of 10 and 20 s showed similar outcomes for BFS and DC %; and BFS for auto-mixed resins (MC and CI) was significantly higher than hand mixed resin. BFS and DC was higher in photopolymerized groups as compared to auto-cured resin regardless of the manipulation technique for both materials (MultiCore and Core it).

Change of Color and Translucency by Light Curing in Resin Composites

2006 ◽  
Vol 31 (5) ◽  
pp. 598-603 ◽  
Author(s):  
S. K. Sidhu ◽  
T. Ikeda ◽  
Y. Omata ◽  
M. Fujita ◽  
H. Sano
Keyword(s):  
Composite Materials ◽  
Clinical Relevance ◽  
Color Change ◽  
Resin Composite ◽  
Resin Composites ◽  
Light Curing ◽  
Shade Matching

Clinical Relevance For the precise shade matching of resin composite materials, clinicians should always be aware of the color change caused by light curing.

Sign in / Sign up

Export Citation Format

Share Document