scholarly journals Depth of cure, flexural properties and volumetric shrinkage of low and high viscosity bulk-fill giomers and resin composites

2017 ◽  
Vol 36 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Akimasa TSUJIMOTO ◽  
Wayne W. BARKMEIER ◽  
Toshiki TAKAMIZAWA ◽  
Mark A. LATTA ◽  
Masashi MIYAZAKI
Keyword(s):  
High Viscosity ◽  
Volumetric Shrinkage ◽  
Flexural Properties ◽  
Resin Composites ◽  
Depth Of Cure

scholarly journals Polymerization Behavior and Mechanical Properties of High-Viscosity Bulk Fill and Low Shrinkage Resin Composites

2017 ◽  
Vol 42 (6) ◽  
pp. E177-E187 ◽  
Author(s):  
S Shibasaki ◽  
T Takamizawa ◽  
K Nojiri ◽  
A Imai ◽  
A Tsujimoto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Resin Composite ◽  
High Viscosity ◽  
The Other ◽  
Light Irradiation ◽  
Volumetric Shrinkage ◽  
Resin Composites ◽  
Polymerization Shrinkage

SUMMARY The present study determined the mechanical properties and volumetric polymerization shrinkage of different categories of resin composite. Three high viscosity bulk fill resin composites were tested: Tetric EvoCeram Bulk Fill (TB, Ivoclar Vivadent), Filtek Bulk Fill posterior restorative (FB, 3M ESPE), and Sonic Fill (SF, Kerr Corp). Two low-shrinkage resin composites, Kalore (KL, GC Corp) and Filtek LS Posterior (LS, 3M ESPE), were used. Three conventional resin composites, Herculite Ultra (HU, Kerr Corp), Estelite ∑ Quick (EQ, Tokuyama Dental), and Filtek Supreme Ultra (SU, 3M ESPE), were used as comparison materials. Following ISO Specification 4049, six specimens for each resin composite were used to determine flexural strength, elastic modulus, and resilience. Volumetric polymerization shrinkage was determined using a water-filled dilatometer. Data were evaluated using analysis of variance followed by Tukey's honestly significant difference test (α=0.05). The flexural strength of the resin composites ranged from 115.4 to 148.1 MPa, the elastic modulus ranged from 5.6 to 13.4 GPa, and the resilience ranged from 0.70 to 1.0 MJ/m3. There were significant differences in flexural properties between the materials but no clear outliers. Volumetric changes as a function of time over a duration of 180 seconds depended on the type of resin composite. However, for all the resin composites, apart from LS, volumetric shrinkage began soon after the start of light irradiation, and a rapid decrease in volume during light irradiation followed by a slower decrease was observed. The low shrinkage resin composites KL and LS showed significantly lower volumetric shrinkage than the other tested materials at the measuring point of 180 seconds. In contrast, the three bulk fill resin composites showed higher volumetric change than the other resin composites. The findings from this study provide clinicians with valuable information regarding the mechanical properties and polymerization kinetics of these categories of current resin composite.

Simulated cuspal deflection and flexural properties of high viscosity bulk-fill and conventional resin composites

2018 ◽  
Vol 87 ◽  
pp. 111-118 ◽  
Author(s):  
Akimasa Tsujimoto ◽  
Yuko Nagura ◽  
Wayne W. Barkmeier ◽  
Hidehiko Watanabe ◽  
William W. Johnson ◽  
...  
Keyword(s):  
High Viscosity ◽  
Flexural Properties ◽  
Resin Composites

Bulk-Fill Resin Composites: Polymerization Contraction, Depth of Cure, and Gap Formation

2015 ◽  
Vol 40 (2) ◽  
pp. 190-200 ◽  
Author(s):  
AR Benetti ◽  
C Havndrup-Pedersen ◽  
D Honoré ◽  
MK Pedersen ◽  
U Pallesen
Keyword(s):  
Resin Composite ◽  
Class Ii ◽  
High Viscosity ◽  
International Organization ◽  
Resin Composites ◽  
Gap Formation ◽  
Depth Of Cure ◽  
Low Viscosity ◽  
Dental Cavities ◽  
Fill Materials

SUMMARY The bulk-filling of deep, wide dental cavities is faster and easier than traditional incremental restoration. However, the extent of cure at the bottom of the restoration should be carefully examined in combination with the polymerization contraction and gap formation that occur during the restorative procedure. The aim of this study, therefore, was to compare the depth of cure, polymerization contraction, and gap formation in bulk-fill resin composites with those of a conventional resin composite. To achieve this, the depth of cure was assessed in accordance with the International Organization for Standardization 4049 standard, and the polymerization contraction was determined using the bonded-disc method. The gap formation was measured at the dentin margin of Class II cavities. Five bulk-fill resin composites were investigated: two high-viscosity (Tetric EvoCeram Bulk Fill, SonicFill) and three low-viscosity (x-tra base, Venus Bulk Fill, SDR) materials. Compared with the conventional resin composite, the high-viscosity bulk-fill materials exhibited only a small increase (but significant for Tetric EvoCeram Bulk Fill) in depth of cure and polymerization contraction, whereas the low-viscosity bulk-fill materials produced a significantly larger depth of cure and polymerization contraction. Although most of the bulk-fill materials exhibited a gap formation similar to that of the conventional resin composite, two of the low-viscosity bulk-fill resin composites, x-tra base and Venus Bulk Fill, produced larger gaps.

scholarly journals Curing Depth of Light-activated Nanofiller containing Resin Composites

2012 ◽  
Vol 3 (2) ◽  
pp. 119-125 ◽  
Author(s):  
Werner J Finger ◽  
Masafumi Kanehira ◽  
Yasuyuki Araki ◽  
Takehiko Wada ◽  
Andreas Utterodt ◽  
...  
Keyword(s):  
Crosslink Density ◽  
Mechanical Characteristics ◽  
Polynomial Regression ◽  
Knoop Hardness ◽  
Resin Composites ◽  
Depth Level ◽  
Depth Of Cure ◽  
Micro Raman Spectroscopy ◽  
Parallel Lines ◽  
Order Polynomial

ABSTRACT Objective To compare the depth of cure of nanofiller containing with conventional resin composites. Materials and methods Five nanofilled and nanohybrid composites were investigated and compared with a microfilled and a microhybrid reference, using the ISO 4049 scraping test, Knoop hardness (KHN) and DC profiling. Specimens from all materials (shade A3) were activated with the same LED light source for 20s. KHN (0.25N/15s) of three specimens each, produced in split molds was measured after 24 hours dark storage on sections perpendicular to the irradiated surface at 250 µm distance along the center line and two parallel lines, 0.5 mm apart, to a depth of 3 mm. Mean KHNs of the three neighboring indentations at each level were calculated. Degree of conversion (DC) was determined on specimens as mentioned above using micro-Raman spectroscopy at 125 µm distance with three measurements at each depth level. Results The depth of cure of all materials was >2 mm when determined according to the ISO test. KHN and DC data followed second order polynomial regression lines (r2 > 0.70; p < 0.001). At 2 mm depth, the KHN of six resin composites was ≤80% of the top KHN whereas the DC of all materials was ≥86% of the maximum DC at the irradiated surface. Conclusion The ISO scraping test overemphasizes the attainable depth of cure, when compared with 80% of top KHN as arbitrarily defined curing depth. KHNs reflect the crosslink density of the polymer, whereas DC additionally includes double bond conversions not contributing to enhancement of mechanical characteristics. How to cite this article Kanehira M, Araki Y, Finger WJ, Wada T, Utterodt A, Komatsu M. Curing Depth of Light-activated Nanofiller containing Resin Composites. World J Dent 2012;3(2): 119-125.

scholarly journals Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

2016 ◽  
Vol 35 (3) ◽  
pp. 418-424 ◽  
Author(s):  
Akimasa TSUJIMOTO ◽  
Wayne W. BARKMEIER ◽  
Toshiki TAKAMIZAWA ◽  
Mark A. LATTA ◽  
Masashi MIYAZAKI
Keyword(s):  
Mechanical Properties ◽  
Resin Composite ◽  
Short Fiber ◽  
Volumetric Shrinkage ◽  
Fiber Reinforced ◽  
Depth Of Cure

scholarly journals How do the optical properties of the bulk fill posterior composites change after 2 years of simulated toothbrushing?

2019 ◽  
Vol 22 (3) ◽  
pp. 378-386
Author(s):  
Leticia Souza Lopes ◽  
Helio Rodrigues Sampaio Filho ◽  
Elisa Gomes Albuquerque ◽  
Chane Tardem ◽  
Mauro Sayão Miranda ◽  
...  
Keyword(s):  
Optical Properties ◽  
Resin Composite ◽  
High Viscosity ◽  
Composite Resins ◽  
Resin Composites ◽  
Regression Analyses ◽  
Significance Level ◽  
Composite Control ◽  
Multifactor Analysis ◽  
Post Hoc

The objective of this study was to evaluate the alteration of the optical properties of bulk Fill resin-based composites after 2 years of simulated toothbrushing. Three high-viscosity bulk fill resin composites and one conventional sculptable resin composite (control) were analyzed. Five specimens of each resin composite were prepared, and roughness, color, translucency and gloss were evaluated initially and after one and two years of simulated toothbrushing. The specimens were submitted to electric simulated toothbrushing (14600 strokes/100g) using a commercially available toothbrush with soft fibers and toothpaste slurry in a proportion of 1:2 by weight. The brushing scheme was of 40 cycles per day (2 cycles per second / 280 cycles in a week). The optical properties and the roughness data were analyzed by a multifactor analysis of variance (MANOVA) and a Tukey post hoc test. The baseline and final values of Ra and Sa were submitted to linear regression analyses, all of which were performed at a significance level of p=0.05. Gloss and roughness presented statistical differences between the resin-time interactions in all composite resins. The gloss (72.5%) and roughness (89.4%) worsened significantly after brushing, but the authors didn’t find statistically significant differences when evaluating translucency and color. Based in the results, it could be concluded that the simulated brushing degraded the brightness and roughness of the used high-viscosity bulk fill composites.

Flexural Properties and Polished Surface Characteristics of a Structural Colored Resin Composite

2021 ◽  
Author(s):  
K Mizutani ◽  
R Ishii ◽  
T Takamizawa ◽  
S Shibasaki ◽  
H Kurokawa ◽  
...  
Keyword(s):  
Surface Properties ◽  
Resin Composite ◽  
Surface Characteristics ◽  
The Other ◽  
Polished Surface ◽  
Flexural Properties ◽  
Strong Positive Correlation ◽  
Resin Composites ◽  
Diamond Bur ◽  
Flexible Disk

SUMMARY Objective: The aim of this study was to determine the flexural properties and surface characteristics of a structural colored resin composite after different finishing and polishing methods, in comparison to those of conventional resin composites. Methods and Materials: A structural color resin composite, Omnichroma (OM, Tokuyama Corp, Chiyoda City, Tokyo, Japan), and two comparison resin composites, Filtek Supreme Ultra (FS, 3M, St Paul, MN, USA) and Tetric EvoCeram (TE, Ivoclar Vivadent, Schaan, Liechtenstein), were used. The flexural properties of the resin composites were determined in accordance with the ISO 4049 specifications. For surface properties, 70 polymerized specimens of each resin composite were prepared and divided into seven groups of 10. Surface roughness (Sa), gloss (GU), and surface free energy (SFE) were investigated after the following finishing and polishing methods. Three groups of specimens were finished with a superfine-grit diamond bur (SFD), and three with a tungsten carbide bur (TCB). After finishing, one of the two remaining groups was polished with a one-step silicone point (CMP), and the other with an aluminum oxide flexible disk (SSD). A group ground with SiC 320-grit was set as a baseline. Results: The average flexural strength ranged from 116.6 to 142.3 MPa in the following order with significant differences between each value: FS &gt; TE &gt; OM. The average E ranged from 6.8 to 13.2 GPa in the following order with significant differences between each value: FS &gt; TE &gt; OM. The average R ranged from 0.77 to 1.01 MJ/mm3 in the following order: OM &gt; FS &gt; TE. The Sa values of the OM groups polished with CMP and SSD were found to be significantly lower than those of the other resin composites, regardless of the finishing method. The GU values appeared to be dependent on the material and the finishing method used. The OM specimens polished with SSD showed significantly higher GU values than those polished with CMP. Most of the resin composites polished with SSD demonstrated significantly higher γS values compared to the other groups. Extremely strong negative correlations between Sa and GU in the combined data from the three resin composites and each resin composite and between Sa and γS in the OM specimens were observed; GU showed a strong positive correlation with γS in the same material. Conclusion: These findings indicate that both flexural and surface properties are material dependent. Furthermore, the different finishing and polishing methods used in this study were observed to affect the Sa, GU, and SFE of the resin composites.

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