scholarly journals The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6025
Author(s):  
Maria Dimitriadi ◽  
Aikaterini Petropoulou ◽  
Konstantinos Masouras ◽  
Maria Zafiropoulou ◽  
Spiros Zinelis ◽  
...  
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Interfacial Strength ◽  
Storage Period ◽  
The Self ◽  
Bottom Surface ◽  
Resin Composites ◽  
Specimen Length ◽  
One Way Anova ◽  
Martens Hardness

To improve the self-curing capacity and interfacial strength with dentine of dual-cured composite materials, touch-cure activators have been introduced. The aim of the study was to evaluate the effect of these activators on the hardness and conversion of dual-cured resin composite core build-up restoratives. The materials tested were Clearfil DC Core Plus (CF) and Gradia Core (GC) with the corresponding adhesives Clearfil S3 Bond Plus (for CF) and G-Premio Bond/G-Premio DCA activator (for GC). Disk-shaped specimens (n = 6/group) were prepared for the following groups: dual-cured, self-cured and self-cured in contact with the adhesive activators at the bottom surface. After a 3-week storage period (dark/dry/37 °C) the Martens hardness (HM) and degree of conversion (DC%) were determined for the previously mentioned groups and the top surfaces of groups in contact with the adhesives. A statistical analysis was performed by a one-way ANOVA and Holm–Sidak test per material and a Pearson’s correlation analysis (HM vs. DC%) at an α = 0.05. The self-cured specimens resulted in significantly lower HM and DC% values from the dual-cured group, as expected. However, in the presence of the adhesives with touch-cure activators, the conversion of the self-cured groups showed insignificant differences in HM and DC% from the dual-cured in both composite materials. The improvements on the bottom composite surfaces in contact with the adhesives did not extend to the entire specimen length. Nevertheless, improved interfacial curing may improve interfacial durability.

scholarly journals Effect of Low Shrinkage Monomers on Physicochemical Properties of Dental Resin Composites

2015 ◽  
Vol 26 (3) ◽  
pp. 272-276 ◽  
Author(s):  
Dayane Carvalho Ramos Salles de Oliveira ◽  
Karla Rovaris ◽  
Viviane Hass ◽  
Eduardo José Souza-Júnior ◽  
Francisco Haiter-Neto ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Physicochemical Properties ◽  
Statistical Difference ◽  
Resin Composite ◽  
Multiple Comparisons ◽  
Resin Composites ◽  
Dental Resin ◽  
Tukey Test ◽  
Dental Resin Composites ◽  
One Way Anova

The aim of this study was to evaluate the effect of low shrinkage monomers on physicochemical properties of dental resin composites. Two low shrinkage resin composites: one with a crosslink branching monomer (Kalore, GC Corp) and a novel monomer (Venus Diamond, Heraeus Kulzer) were compared to a conventional resin composite formulation (Filtek Z250, 3M/ESPE). The volumetric shrinkage was evaluated by µCT analysis (n=5) and the physicochemical properties by degree of C=C conversion (DC), flexural strength (FS) and Young's modulus (YM) (n=10). All samples were light cured by a LED device (Radii, SDI) with 16 J/cm2. The results were analysed by one-way ANOVA and Tukey test for multiple comparisons (α=0.05). No statistical difference was found between µCT shrinkage values to Kalore (1.8%) and Venus Diamond (1.7%) (p≥0.05); Z250 presented statistical highest shrinkage value (2.0%). Kalore presented higher statistical DC (60.8%) than Venus Diamond (49.5%) and Z250 (49.6%). No statistical difference was found between FS or YM properties to Venus Diamond and Z250; Kalore presented statistical lowest FS and YM properties (p≥0.05). Conclusion: Using novel monomers seem to reduce polymerization shrinkage without affecting the physicochemical properties evaluated of resin composites rather than using crosslink branching monomers.

scholarly journals Solubility of Two Resin Composites in Different Mouthrinses

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Sezin Ozer ◽  
Emine Sen Tunc ◽  
Nuray Tuloglu ◽  
Sule Bayrak
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Artificial Saliva ◽  
Resin Composites ◽  
Constant Mass ◽  
Composite Restorations ◽  
Before And After ◽  
The Difference ◽  
Post Hoc

Aim. This study aimed to compare the solubility of a universal restorative resin composite (Filtek Z250; FZ250) and a silorane-based resin composite (Filtek Silorane; FS) after immersion in alcohol-containing mouthrinse, alcohol-free mouthrinse, and artificial saliva.Methods. 30 discs (10 mm × 1 mm) were prepared from each material and desiccated until a constant mass was obtained. Specimens were immersed in the test solutions for two days and desiccated again. Solubility was calculated based on the change in weight of each specimen before and after immersion. Data was analyzed using two-way ANOVA and Tukey’s Post Hoc testP<0.05.Results. Solubility values for both resin composites were the highest in the alcohol-containing mouthrinse. FZ250 showed greater solubility than FS; the difference was only significant in artificial saliva.Conclusion. Both resin-composite materials tested exhibited some degree of solubility in each of the test solutions. The use of an alcohol-free mouthrinse may be preferable for patients with extensive composite restorations.

Research on Absorbing Properties of Nickel Plating Carbon Fiber-Resin Composites

2011 ◽  
Vol 239-242 ◽  
pp. 1694-1698 ◽  
Author(s):  
Yan Qin ◽  
Yong Zhou ◽  
Zhi Xiong Huang
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Epoxy Matrix ◽  
Resin Composite ◽  
Quality Score ◽  
Resin Composites ◽  
Nickel Plating ◽  
X Band ◽  
Absorbing Material ◽  
Ku Band

It is a way of preparing absorbing composite materials when nickel plating carbon fiber is arranged in epoxy matrix orthogonally. The results indicated that after carbon fiber T - 700 was plated by nickel, the absorbing properties were remarkably improved. In nickel plating carbon fiber/resin composite absorbing material, the distance and quality score of carbon fiber in the resin have important influence on absorbing properties. When the distance was between 5mm and 8mm, and quality score is in 0.53wt % ~ 2.16 wt %,we can get the absorbing material that was less than - 5db in the X band and - 10db in the Ku band.

scholarly journals Radiopacity evaluation of contemporary resin composites by digitization of images

2014 ◽  
Vol 08 (03) ◽  
pp. 342-347 ◽  
Author(s):  
R. Banu Ermis ◽  
Derya Yildirim ◽  
Gul Yildiz ◽  
Ozlem Gormez
Keyword(s):  
Composite Materials ◽  
Analysis Of Variance ◽  
Resin Composite ◽  
Composite Resins ◽  
International Organization ◽  
Resin Composites ◽  
International Organization For Standardization ◽  
Human Enamel ◽  
Test Materials ◽  
Gray Values

ABSTRACT Objective: The aim of this study was to evaluate the radiopacity of different composite resins and compare the values to those of human enamel and dentine. Materials and Methods: Five specimens of each material with thicknesses of 2 mm were prepared and radiographed alongside aluminum step wedge and human enamel and dentin. Three occlusal radiographs for each material were taken and digitized using a desktop scanner. Mean gray values of the test materials were measured using Image J software. Then a conversion was performed according to establish the radiopacity of the test materials, in millimeters of equivalent Al. Data were analyzed using one-way analysis of variance and Duncan multiple range tests (P < 0.05). Results: The radiopacity values varied among the restorative materials (P < 0.05). The radiopacity values of the materials tested were, in decreasing order: Enamel Plus HRI > Z250 > Filtek Ultimate ≥ Z550 > Nexcomp ≥ Nanoceram Bright > enamel ≥ Estelite Sigma Quick > Clearfil Majesty Esthetic ≥ Reflexions XLS ≥ Aelite LS Posterior ≥ dentin ≥ 2 mm Al. Conclusion: All resin composite materials investigated in this study presented different radiopacity values. However, all materials had radiopacity values greater than dentin and had sufficient radiopacity to meet International Organization for Standardization 4049 standard.

scholarly journals Evaluation of Resin Composite Translucency by Two Different Methods

2013 ◽  
Vol 38 (3) ◽  
pp. E76-E90 ◽  
Author(s):  
D-H Kim ◽  
S-H Park
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Resin Composite ◽  
Pearson Correlation ◽  
Computer Software ◽  
Evaluation Methods ◽  
Light Transmittance ◽  
Different Types ◽  
The Mean ◽  
One Way Anova

SUMMARY The purpose of this study was 1) to compare the translucency of seven different types of composite materials and three different shade categories (dentin, enamel, and translucent) by determining the translucency parameter (TP) and light transmittance (%T) and 2) to evaluate the correlation between the results of the two evaluation methods. Three shades (dentin A3, enamel A3, and clear translucent) of seven composite materials (Beautifil II [BF], Denfil [DF], Empress Direct [ED], Estelite Sigma Quick [ES], Gradia Direct [GD], Premise [PR], and Tetric N-Ceram [TC]) from different manufacturers were screened in this study. Ten disk-shaped specimens (10 mm in diameter and 1 mm in thickness) were prepared for each material. For the TP measurements, the colors of each specimen were recorded according to the CIELAB color scale against white and black backgrounds with a colorimeter and used to calculate the TP value. For the %T measurements, the mean direct transmittance through the specimen in the range between 380 and 780 nm was recorded using a spectrometer and computer software. Two-way analysis of variance (ANOVA) tests were performed to compare the TP and %T for the composite materials and shade categories. One-way ANOVA and Tukey tests were used for the seven composite materials per shade category and the three shade categories per composite material. The correlation between the two evaluation methods was determined using the Pearson correlation coefficient. All statistical procedures were performed within a 95% confidence level. TP differed significantly by composite material within each shade category (p&lt;0.05) and by shade category within each composite material (p&lt;0.05). %T differed significantly by composite material within each shade category (p&lt;0.05) and by shade categories within each composite material (p&lt;0.05), except for BF and ES. For the two evaluation methods, TP and %T, were positively correlated (r=0.626, p&lt;0.05). These methods showed strong correlation for each composite material except ES (r=0.763-0.992, p&lt;0.05) and moderate correlation for each shade category (r=0.403-0.528, p&lt;0.05).

Metal-Filled Resin Composites

1973 ◽  
Vol 52 (3) ◽  
pp. 522-532 ◽  
Author(s):  
R.L. Bowen ◽  
H.H. Chandler
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Resin Composite ◽  
Metal Particles ◽  
Coupling Agents ◽  
Resin Composites

Certain physical properties of metal-filled resin composite materials can be improved if properly selected and applied coupling agents are used in treating the surfaces of the metal particles.

Wear Simulation of Resin Composites and the Relationship to Clinical Wear

10.2341/07-67 ◽  
2008 ◽  
Vol 33 (2) ◽  
pp. 177-182 ◽  
Author(s):  
W. W. Barkmeier ◽  
M. A. Latta ◽  
R. L. Erickson ◽  
T. M. Wilwerding
Keyword(s):  
Composite Materials ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Resin Composites ◽  
Wear Simulation ◽  
Wear Rates ◽  
The Relationship

Clinical Relevance Laboratory wear simulation may be useful for estimating the relative clinical wear rates of new resin composite materials.

Wear Rates of Resin Composites

2013 ◽  
Vol 38 (2) ◽  
pp. 226-233 ◽  
Author(s):  
WW Barkmeier ◽  
RL Erickson ◽  
MA Latta ◽  
TM Wilwerding
Keyword(s):  
Stainless Steel ◽  
Composite Materials ◽  
Wear Rate ◽  
Loss Rate ◽  
Resin Composite ◽  
Linear Wear ◽  
Resin Composites ◽  
Volume Loss ◽  
Wear Rates ◽  
Significant Difference

SUMMARY A laboratory study was conducted to examine the wear of resin composite materials using a generalized wear simulation model. Ten specimens each of five resin composites (Esthet•X [EX], Filtek Supreme Plus [SP], Filtek Z250 [Z2], Tetric EvoCeram [EC], and Z100 Restorative [Z1]) were subjected to wear challenges of 100,000, 400,000, 800,000, and 1,200,000 cycles. The materials were placed in cylinder-shaped stainless-steel fixtures, and wear was generated using a flat stainless-steel antagonist in a slurry of polymethylmethacrylate beads. Wear (mean facet depth [μm] and volume loss [mm3]) was determined using a noncontact profilometer (Proscan 2000) with Proscan and ProForm software. Statistical analysis of the laboratory data using analysis of variance and Tukey's post hoc test showed a significant difference (p&lt;0.05) for mean wear facet depth and volume loss for both the number of cycles and resin composite material. Linear regression analysis was used to develop predictive wear rates and volume loss rates. Linear wear was demonstrated with correlation coefficients (R2) ranging from 0.914 to 0.995. Mean wear values (mean facet depth [μm]) and standard deviations (SD) for 1200K cycles were as follows: Z1 13.9 (2.0), Z2 26.7 (2.7), SP 30.1 (4.1), EC 31.8 (2.3), and EX 67.5 (8.2). Volume loss (mm3) and SDs for 1200K cycles were as follows: Z1 0.248 (0.036), Z2 0.477 (0.044), SP 0.541 (0.072), EC 0.584 (0.037), and EX 1.162 (0.139). The wear rate (μm) and volume loss rate (mm3) per 100,000 cycles for the five resin composites were as follows: wear rate Z1 0.58, EC 1.27, Z2 1.49, SP 1.62, and EX 4.35, and volume loss rate Z1 0.009, EC 0.024, Z2 0.028, SP 0.029, and EX 0.075. The generalized wear model appears to be an excellent method for measuring relative wear of resin composite materials.

scholarly journals Cuspal Deflection in Premolar Teeth Restored with Bulk-Fill Resin-Based Composite Materials

2018 ◽  
Vol 43 (1) ◽  
pp. E1-E9 ◽  
Author(s):  
MM Elsharkasi ◽  
JA Platt ◽  
NB Cook ◽  
GH Yassen ◽  
BA Matis
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
High Viscosity ◽  
Resin Composites ◽  
Natural Teeth ◽  
Fill Materials

SUMMARY The present study investigated the effect of three high-viscosity bulk-fill resin-based composite materials on cuspal deflection in natural teeth. Thirty-two sound maxillary premolar teeth with large slot mesio-occlusal-distal cavities were distributed into four groups (n=8). Three groups were restored with bulk-fill resin composite materials (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent, Schaan, Liechtenstein; x-tra fil, VOCO, Cuxhaven, Germany; and SonicFill, Kerr, Orange, CA, USA) in a single 4-mm increment. The conventional composite group, Filtek Z100 (3M ESPE, St Paul, MN, USA), was used to restore the cavities in 2-mm increments. Cusp deflection was recorded postirradiation using a Nikon measurescope UM-2 (Nikon, Tokyo, Japan) by measuring the changes in the bucco-palatal widths of the teeth at five minutes, 24 hours, and 48 hours after completion of the restorations. Cuspal deflection was significantly higher in the conventional composite than in the Tetric EvoCeram Bulk Fill (p=0.0031), x-tra fil (p=0.0029), and SonicFill Bulk (p=0.0002) groups. There were no significant differences in cuspal deflection among the three bulk-fill materials (all p&lt;0.05). In conclusion, all the investigated bulk-fill resin composites exhibited cuspal deflection values that were smaller than those associated with a conventional incrementally placed resin composite.

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.

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