Effect of exposure time and pre-heating on the conversion degree of conventional, bulk-fill, fiber reinforced and polyacid-modified resin composites

Lempel, Edina; Őri, Zsuzsanna; Szalma, József; Lovász, Bálint Viktor; Kiss, Adam K.; Tóth, Arnold; Kunsági‐Máté, Sándor

doi:10.1016/j.dental.2018.11.017

Cited by 45 publications

(62 citation statements)

References 49 publications

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“…In addition to paste composition, temperature also affected stickiness and packability: [7,29,32]. Thus, pre-heated Viscalor (T3-30s and T3-3min) inserted into the brass cavity showed similar Fmax results to Viscalor (no heat) at 37 °C due to the similar composite temperature.…”

Section: Discussionmentioning

confidence: 88%

“…Moderate temperature rise after pre-heating generates greater mobility of monomer free radicals -as and when they are generated by photo-initiation. The temperature rise delays auto-deceleration during polymerization and leads to the increased DC% [7,26,29,32,48,49]. Higher monomer conversion has been observed after pre-heating composites at 54 °C, however, high polymerization shrinkage also occur with high DC% [7,26,50].…”

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].…”

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: 88%

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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“…Gyakorlati szempontból fontos megemlíteni, hogy jelen vizsgálatban, a gyártó utasításainak megfelelően, az SFRC-t bulk fill anyagként egy rétegben helyeztük a kavitásba. Vizsgálatok bizonyítják, hogy az SFRC transzparens tulajdonsága és a rövid üvegszálak fényvezető tulajdonsága által az anyagot 4-5 mm mélységig át lehet megfelelően világítani, fotopolimerizálni [10,16].…”

Section: Megbeszélésunclassified

Direkt restauratív technikák összehasonlítása MOD kavitással rendelkező fogakban üvegszálas anyagok felhasználásával – előzetes tanulmány

Sáry

Nagy

2019

fogorv-szemle

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Bevezetés: Kutatásunkban különböző üvegszálas anyagokkal és eltérő direkt technikákkal II. osztályú mezio-okkluzo-disztális (MOD) üregekbe elkészített direkt restaurátumokat hasonlítottunk össze statikus törési ellenállási teszt segítségével.Anyag és módszer: 72 alsó moláris fogat 6 csoportba osztottunk (n = 12). A kontrollként szolgáló csoporton kívül az összes fogba II. osztályú MOD kavitásokat fúrtunk, majd ezeket vegyesen üvegszálas hálóval, rövid üvegszálas kompozittal (SFRC) és hagyományos kompozittal restauráltuk. A fogak tesztelése statikus törési ellenállással történt, az értékeket Newtonban regisztráltuk. A létrejött törés mintázatát is értékeltük.Eredmények: Az ép fogak (2099 ± 351,04 N), a 3. (SFRC – 1645 ± 457 N) és 6. csoportok (körkörösen elhelyezett üvegszálas háló – 2019 ± 352 N) értékei között nem volt szignifikáns különbség.Megbeszélés: A mechanikai tesztelés eredményeként leginkább a körkörösen elhelyezett üvegszálas hálóval restaurált csoport értékei közelítették meg az ép fogak törési ellenállási értékeit. A hagyományos kompozit restaurátummal ellátott fogak szignifikánsan gyengébben teljesítettek, mint a kontroll csoport fogai.

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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].…”

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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Effect of exposure time and pre-heating on the conversion degree of conventional, bulk-fill, fiber reinforced and polyacid-modified resin composites

Cited by 45 publications

References 49 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

Direkt restauratív technikák összehasonlítása MOD kavitással rendelkező fogakban üvegszálas anyagok felhasználásával – előzetes tanulmány

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

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