Polymerization shrinkage and shrinkage force kinetics of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites

SUMMARY The present study assessed the polymerization shrinkage stress kinetics of five low-shrinkage light-cured bulk-fill resin composites: Surefil SDR flow (SF, Dentsply), Tetric EvoCeram Bulkfil (TE, Ivoclar Vivadent), Venus Bulk Fill (VB, Heraeus Kulzer), x-tra fil (XF, Voco), and experimental bulk fill (FB, 3M ESPE). Filtek Z250 (FZ, 3M ESPE) was used as a control. Real-time shrinkage stress of investigated composites was measured using a tensometer; maximum shrinkage stress, stress rate (Rmax), and time to reach maximum stress rate (tmax) were recorded. Flexural strength and modulus were measured using a standard procedure, and curing efficiency of 4-mm long specimens was determined using bottom/top percentage Knoop microhardness. Data were analyzed using one-way analysis of variance and Bonferroni multiple range tests at a significance level of α=0.05. Results of shrinkage stress, Rmax, and tmax of all bulk-fill materials were significantly lower (p<0.05) than those of the control except for XF. All tested bulk-fill materials were able to achieve acceptable curing efficiency (≥80% bottom/top percentage) at 4-mm depth. In conclusion, this study reports a significant reduction in polymerization shrinkage stress while maintaining comparable curing efficiency at 4 mm for some bulk-fill composites and supports their potential use in posterior clinical situations.

Download Full-text

Temperature-dependent polymerization shrinkage stress kinetics of resin-composites

Dental Materials ◽

10.1016/j.dental.2014.03.004 ◽

2014 ◽

Vol 30 (6) ◽

pp. 654-660 ◽

Cited By ~ 20

Author(s):

D.C. Watts ◽

A. Alnazzawi

Keyword(s):

Shrinkage Stress ◽

Resin Composites ◽

Temperature Dependent ◽

Polymerization Shrinkage ◽

Kinetics Of

Download Full-text

Marginal Adaptation and Micropermeability of Class II Cavities Restored with Three Different Types of Resin Composites—A Comparative Ten-Month In Vitro Study

Polymers ◽

10.3390/polym13101660 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1660

Author(s):

Sevda Mihailova Yantcheva

Keyword(s):

Methylene Blue ◽

In Vitro Study ◽

Sem Analysis ◽

Marginal Adaptation ◽

Resin Composites ◽

Polymerization Shrinkage ◽

Gingival Margin ◽

Different Types ◽

Ageing Period

The development of composite materials is subject to the desire to overcome polymerization shrinkage and generated polymerization stress. An indicator characterizing the properties of restorative materials, with specific importance for preventing secondary caries, is the integrity and durability of marginal sealing. It is a reflection of the effects of polymerization shrinkage and generated stress. The present study aimed to evaluate and correlate marginal integrity and micropermeability in second-class cavities restored with three different types of composites, representing different strategies to reduce polymerization shrinkage and stress: nanocomposite, silorane, and bulk-fill composite after a ten-month ageing period. Thirty standardized class ΙΙ cavities were prepared on extracted human molars. Gingival margins were 1 mm apical to the cementoenamel junction. Cavities were randomly divided into three groups, based on the composites used: FiltekUltimate-nanocomposite; Filtek Silorane LS-silorane; SonicFill-bulk-fill composite. All specimens were subjected to thermal cycles after that, dipped in saline for 10-mounds. After ageing, samples were immersed in a 2% methylene blue. Thus prepared, they were covered directly with gold and analyzed on SEM for assessment of marginal seal. When the SEM analysis was completed, the teeth were included into epoxy blocks and cut longitudinally on three slices for each cavity. An assessment of microleakage on stereomicroscope followed. Results were statistically analyzed. For marginal seal evaluation: F.Ultimate and F.Silorane differ statistically with more excellent results than SonicFill for marginal adaptation to the gingival margin, located entirely in the dentin. For microleakage evaluation: F.Ultimate and F.Silorane differ statistically with less microleakage than SonicFill. Based on the results obtained: a strong correlation is found between excellent results for marginal adaptation to the marginal gingival ridge and micropermeability at the direction to the axial wall. We observe a more significant influence of time at the gingival margin of the cavities. There is a significant increase in the presence of marginal fissures (p = 0.001). A significant impact of time (p < 0.000) and of the material (p < 0.000) was found in the analysis of the microleakage.

Download Full-text

Kinetics of the phase separation of a low-viscosity liquid supersaturated with gas at the intermediate and later stages

Colloid Journal ◽

10.1007/s10595-005-0010-y ◽

2005 ◽

Vol 67 (1) ◽

pp. 85-96 ◽

Cited By ~ 2

Author(s):

V. V. Slezov ◽

A. S. Abyzov ◽

Zh. V. Slezova

Keyword(s):

Phase Separation ◽

Low Viscosity ◽

Kinetics Of

Download Full-text

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

Operative Dentistry ◽

10.2341/19-101-l ◽

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.

Download Full-text

A new method to measure the polymerization shrinkage kinetics of composites using a particle tracking method with computer vision

Dental Materials ◽

10.1016/j.dental.2011.10.005 ◽

2012 ◽

Vol 28 (2) ◽

pp. 212-218 ◽

Cited By ~ 16

Author(s):

In-Bog Lee ◽

Sun-Hong Min ◽

Deog-Gyu Seo

Keyword(s):

Computer Vision ◽

Particle Tracking ◽

New Method ◽

Polymerization Shrinkage ◽

Tracking Method ◽

Particle Tracking Method ◽

Kinetics Of

Download Full-text

The Silorane-based Resin Composites: A Review

Operative Dentistry ◽

10.2341/15-311-lit ◽

2017 ◽

Vol 42 (1) ◽

pp. E24-E34 ◽

Cited By ~ 9

Author(s):

GA Maghaireh ◽

NA Taha ◽

H Alzraikat

Keyword(s):

Mechanical Properties ◽

Bond Strength ◽

Clinical Significance ◽

Physical And Mechanical Properties ◽

Marginal Adaptation ◽

Resin Composites ◽

Restorative Material ◽

Polymerization Shrinkage ◽

Tooth Structure

SUMMARY This article aims to review the research done on the silorane-based resin composites (SBRC) regarding polymerization shrinkage and contraction stresses and their ability to improve the shortcomings of the methacrylate-based resin composites (MRBC). Special attention is given to their physical and mechanical properties, bond strength, marginal adaptation, and cusp deflection. The clinical significance of this material is critically appraised with a focus on the ability of SBRC to strengthen the tooth structure as a direct restorative material. A search of English peer-reviewed dental literature (2003-2015) from PubMed and MEDLINE databases was conducted with the terms “low shrinkage” and “silorane composites.” The list was screened, and 70 articles that were relevant to the objectives of this work were included.

Download Full-text

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

BioMed Research International ◽

10.1155/2019/4250284 ◽

2019 ◽

Vol 2019 ◽

pp. 1-7 ◽

Cited By ~ 1

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.

Download Full-text