Polymerization kinetics and impact of post polymerization on the Degree of Conversion of bulk-fill resin-composite at clinically relevant depth

Al-Ahdal, Khold; Ilie, Nicoleta; Silikas, Nick; Watts, David C.

doi:10.1016/j.dental.2015.07.004

Cited by 105 publications

(92 citation statements)

References 35 publications

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“…These results were consistent with a previous study which reported a strong correlation (R 2 >0.90) between curing depth and the degree (%) of conversion of bulk-fill resin composites (BF, SD, BB and TB) 13) . Another reported study showed that the degree of conversion of BB was lower than that of TB and FB 22) . These results are consistent with the results of the present laboratory investigation, showing a lower depth of cure for the giomers compared to resin composites, and suggests that the lower depth of cure may be due to a reduced degree of conversion.…”

Section: Discussionmentioning

confidence: 99%

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

Tsujimoto

Barkmeier

Takamizawa

et al. 2017

Dental Materials Journal

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The purpose of this study was to investigate the depth of cure, flexural properties and volumetric shrinkage of low and high viscosity bulk-fill giomers and resin composites. Depth of cure and flexural properties were determined according to ISO 4049, and volumetric shrinkage was measured using a dilatometer. The depths of cure of giomers were significantly lower than those of resin composites, regardless of photo polymerization times. No difference in flexural strength and modulus was found among either high or low viscosity bulk fill materials. Volumetric shrinkage of low and high viscosity bulk-fill resin composites was significantly less than low and high viscosity giomers. Depth of cure of both low and high viscosity bulk-fill materials is time dependent. Flexural strength and modulus of high viscosity or low viscosity bulk-fill giomer or resin composite materials are not different for their respective category. Resin composites exhibited less polymerization shrinkage than giomers.

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Section: Discussionmentioning

confidence: 99%

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

Tsujimoto

Barkmeier

Takamizawa

et al. 2017

Dental Materials Journal

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“…Recently, the use of bulk-fill composites has increased among clinicians, with increments up to 4-mm being usually recommended, reportedly without compromise to the polymerization of composite or changes to the stress development compared with the traditional incremental technique [9, 10]. Those materials are specially formulated with higher concentration of or more efficient photoinitiator systems, and/or with reduced filler content [11].…”

Section: Introductionmentioning

confidence: 99%

Impact of thio-urethane additive and filler type on light-transmission and depth of polymerization of dental composites

Faria-e-Silva

Pfeifer

2017

Dental Materials

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Objectives This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. Methods BisGMA:UDMA:TEGMA (5:3:2 wt%) were mixed with 0 (control) or 20 wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization. The irradiance reaching the bottom of 3-mm thick specimens was measured during the polymerization. Degree of conversion to a depth of 5 mm was mapped. An optical bench was used to simultaneously follow conversion and light transmission. Results The addition of thio-urethane increased the RI for all composites. As expected, RI also increased with conversion for all materials. The one exception was for the material filled with OX-50, in which the RI of the composite decreased with conversion. In this case, the irradiance at the bottom of the 3 mm specimen was also the lowest among all groups. The addition of thio-utethanes had only minimal effect on light transmission within a filler type, but led to increased conversion in depth for all groups. The filler type itself had a greater effect on light transmission, and that correlated well with the degree of conversion. Significance The effect of the Thio-urethane addition on degree of conversion in depth was dependent on filler type. The additive can be tailored to improve the RI match with the filler to optimize light transmission in dental composites.

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“…16,36 Kompozit rezinlerin yapısında bulunan karbon çift baların dönüşüm hızı ne kadar yüksek ise materyal basma dayanımı, aşınma direnci ve sertlik gibi fiziksel ve mekanik özellikleri de o derecede yüksek olmaktadır. 37 Dönüşüm derecesinin az olması, sitotoksisiteye, sertliin azalmasına, aşın-maya, marjinal bozulmalara, mikrosızıntının artmas1na ve sonuç olarak sekonder çürüklere ve pulpal irritasyonlara sebep olabilir.…”

Section: Poli̇meri̇zasyon Derecesi̇unclassified

“…38 Dönüşüm derecesini etkileyen birçok faktör vardır: rezinin içeriği (doldurucu tipi, büyüklüğü, başlatıcı konsantrasyonu, monomer bileşeni gibi), ışık cihazına ait faktörler (ışık yoğunluğu, absorbsiyonu), sıcaklık, operatörle ilişkili faktörler (kompozit tabakası kalınlığı, ışık cihazı ucunun rezin restorasyona mesafesi). 16,36 İdeal olarak polimerizasyon reaksiyonu sıra-sında kompozit rezin içindeki tüm monomerler polimere dönüşmüş olmalıdır ancak materyalin son halinde %55-75 arasında değişen dönüşüm dereceleriyle rezidüel çift karbon bağları sergilemektedir. 36 …”

Section: Poli̇meri̇zasyon Derecesi̇unclassified

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Analysis Methods Regarding the Polymerization Properties of Composite Resins

Ağaccıoğlu¹,

Aytaç²

2019

Turkiye Klinikleri J Dental Sci

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Polymerization kinetics and impact of post polymerization on the Degree of Conversion of bulk-fill resin-composite at clinically relevant depth

Cited by 105 publications

References 35 publications

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

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

Impact of thio-urethane additive and filler type on light-transmission and depth of polymerization of dental composites

Analysis Methods Regarding the Polymerization Properties of Composite Resins

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