Rheological properties of contemporary nanohybrid dental resin composites: The influence of preheating

Metalwala, Z.; Khoshroo, Kimia; Rasoulianboroujeni, Morteza; Tahriri, M.; Johnson, A. F.; Baeten, John; Fahimipour, Farahnaz; Ibrahim, Mona E.; Tayebi, Lobat

doi:10.1016/j.polymertesting.2018.10.013

Cited by 27 publications

(27 citation statements)

References 25 publications

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“…According to previous studies, high filler loading tends to produce low stickiness [8,17] as it hinders composite flowability and creates high viscosity [37]. Admira Fusion, Viscalor properties: resin matrix, filler particle content, shape, size and distribution, silane surface treatment, interlocking between particles and other interfacial interactions between resin matrix and filler [30,43]. Generally, increasing filler loading and using smaller, irregularshaped particles increases viscosity [30,44].…”

Section: Discussionmentioning

confidence: 99%

“…Admira Fusion, Viscalor properties: resin matrix, filler particle content, shape, size and distribution, silane surface treatment, interlocking between particles and other interfacial interactions between resin matrix and filler [30,43]. Generally, increasing filler loading and using smaller, irregularshaped particles increases viscosity [30,44]. Filler particle sizes of TPH LV (1.35 μm) [45] and Tetric EvoCeram (40 nm -3 μm) [46] are lower than those in Filtek Supreme Ultra (0.6 -10 μm) [47].…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have evaluated pre-heating RBCs before placement [25,28,29]. Preheating makes highly-packed RBCs more fluid and easier to manipulate, without compromising their superior mechanical properties [30]. But after pre-heating the elevated temperature may cause thermal damage to the pulp [31].…”

Section: Introductionmentioning

confidence: 99%

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Pre-heating effects on extrusion force, stickiness and packability of resin-based composite

2019

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Objectives. To measure temperature effects on stickiness and packability of representative resin-based composites and the effect of pre-heating time on pre-cure properties of Viscalor, including extrusion force. Methods. Five resin-based composites (RBC) and an additional RBC, Viscalor, used with a Caps Warmer (VOCO, Germany) were studied. The extrusion force (N) and extruded mass (g) were measured from Viscalor compules heated in T3 mode for 30 s (T3-30s) and 3 min (T3-3min). For stickiness and packability measurements, RBCs were packed into a brass cylindrical cavity controlled at 22 and 37 °C. A flat-ended probe was lowered into the RBC pastes at constant speed. Stickiness: Fmax (N) and Ws (N mm), and packability: Fp (N), were measured. Viscalor was LED photo-cured at 1,200 mW/cm 2 for 40 s. The degrees of conversion at 5 min and 24 h post cure (DC5min and DC24h) of Viscalor (no heat, T3-30s and T3-3min) were measured by ATR-FTIR. Data were analysed by one-way ANOVA, independent T-test and Tukey post-hoc tests (p<0.05). Results. The maximum temperature of the Caps Warmer, in T3 mode, reached 68 °C in 20 min. Viscalor temperatures of 34.5 °C and 60.6 °C were recorded after 30 s and 3 min preheating, respectively. Pre-heating significantly reduced extrusion force and increased extruded mass, especially after 3 min. RBCs varied in Fmax, Ws and Fp (p<0.05). Temperature also affected Fmax (p=0.000), Ws (p=0.002) and Fp (p=0.000). Pre-heating Viscalor for either 30 s or 3 min did not increase the post-cure DC at either 5 min or 24 h, relative to no pre-heating (p>0.05). Significance. The composites varied to an extent in stickiness and packability but the overall magnitudes remained within a clinically acceptable range. Pre-heating was beneficial in placement of Viscalor and caused no adverse effects through premature polymerization.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Pre-heating effects on extrusion force, stickiness and packability of resin-based composite

2019

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“…The rheological properties of the 1090, 2080, 3070, and 4060 resin blends were investigated [40,41], and the results are shown in Figure 3. As the temperature increased, their viscosities all first decreased and then reached a steady state before rapidly increasing.…”

Section: Resultsmentioning

confidence: 99%

Blends of Cyanate Ester and Phthalonitrile–Polyhedral Oligomeric Silsesquioxane Copolymers: Cure Behavior and Properties

Zhou

Zheng

et al. 2019

Polymers

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Blends of cyanate ester and phthalonitrile–polyhedral oligomeric silsesquioxane copolymers were prepared, and their cure behavior and properties were compared via differential scanning calorimetry (DSC) analysis, thermogravimetric (TG) analysis, dynamic mechanical analysis, Fourier-transform far-infrared (FTIR) spectroscopy, and rheometric studies. The copolymer blends showed high chemical reactivity, low viscosity, and good thermal stability (TG temperatures were above 400 °C). The glass-transition temperature of the blends increased by at least 140 °C compared to cyanate ester resin. The blends are suitable for preparing carbon-fiber-reinforced composite materials via a winding process and a prepreg lay-up process with a molding technique. The FTIR data showed that the polymerization products contained triazine-ring structures that were responsible for the superior thermal properties.

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“…Several studies have evaluated pre-polymerization heating of dental composite resins [7][8][9]. Preheating makes resin-based composites more fluid and easier to manipulate, without compromising their superior mechanical properties [10]. Enhanced flowability can be advantageous in achieving a better adaptation to the cavity walls [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Substantiation of the Pre-Polymerization Heating Efficiency of the Dental Nanocomposite Material

Khabadze

Kulíková

Abdulkerimova

et al. 2020

Pesqui. Bras. Odontopediatria Clín. Integr.

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To evaluate the effect of pre-polymerization heating of nanocomposite filling materials on their strength properties within one manufacture group. Material and Methods: Two nanocomposite filling materials Enamel Plus HRi Universal Dentin ® and Universal Enamel ® were used. The linear thermal expansion coefficient (LTEC), Young's modulus and penetration depth were determined during the tests. Changes in the structure of materials were evaluated using electron scanning microscopy. Results: Dentin nanocomposite samples after pre-heating and polymerization have higher LTEC after 30°C compared to dentine nanocomposite untreated samples with statistically significance started at 62°C (p<0.05) and higher temperature. Pre-polymerization heated samples had a statistically higher LTEC (p<0.05) at 57°С. It was revealed that Young's modulus of the dentin nanocomposite samples after thermal processing at 55°C was higher in total after the first heating cycle by 15% compared to the untreated dentin nanocomposite samples (p<0.05). The volume of total porosity after pre-heating decreased to 5-7% (p<0.05). Conclusion: The material that has undergone preliminary heat processing is significantly less deformed under load than the material that does not have thermal processing during the research was established and also has a denser structure.

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Rheological properties of contemporary nanohybrid dental resin composites: The influence of preheating

Cited by 27 publications

References 25 publications

Pre-heating effects on extrusion force, stickiness and packability of resin-based composite

Pre-heating effects on extrusion force, stickiness and packability of resin-based composite

Blends of Cyanate Ester and Phthalonitrile–Polyhedral Oligomeric Silsesquioxane Copolymers: Cure Behavior and Properties

The Substantiation of the Pre-Polymerization Heating Efficiency of the Dental Nanocomposite Material

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