Polymerization development of “low-shrink” resin composites: Reaction kinetics, polymerization stress and quality of network

Yamasaki, L.C.; DeVito-Moraes, André Guaraci; Barros, Mércia Maria Semensato Bottura de; Lewis, Shawna; Francci, Carlos Eduardo; Stansbury, Jeffrey W.; Pfeifer, Carmem S.

doi:10.1016/j.dental.2013.04.021

Cited by 64 publications

(54 citation statements)

References 52 publications

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“…18,19 Current literature already provides DOC and DC data for several restorative bulk-fill materials. 15,16,17,18,20,21,22,23 Therefore, the aim of this systematic review was to assess the scientific literature that evaluated the efficiency of polymerization of bulk-fill composite resins by assessing DOC and DC to answer the clinical question: can Bulk-fill resin composites be placed and cured properly in 4 mm increments?…”

Section: Introductionmentioning

confidence: 99%

Efficiency of polymerization of bulk-fill composite resins: a systematic review

et al. 2017

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This systematic review assessed the literature to evaluate the efficiency of polymerization of bulk-fill composite resins at 4 mm restoration depth. PubMed, Cochrane, Scopus and Web of Science databases were searched with no restrictions on year, publication status, or article's language. Selection criteria included studies that evaluated bulk-fill composite resin when inserted in a minimum thickness of 4 mm, followed by curing according to the manufacturers' instructions; presented sound statistical data; and comparison with a control group and/or a reference measurement of quality of polymerization. The evidence level was evaluated by qualitative scoring system and classified as high-, moderate-and low-evidence level. A total of 534 articles were retrieved in the initial search. After the review process, only 10 full-text articles met the inclusion criteria. Most articles included (80%) were classified as high evidence level. Among several techniques, microhardness was the most frequently method performed by the studies included in this systematic review. Irrespective to the "in vitro" method performed, bulk fill RBCs were partially likely to fulfill the important requirement regarding properly curing in 4 mm of cavity depth measured by depth of cure and / or degree of conversion. In general, low viscosities BFCs performed better regarding polymerization efficiency compared to the high viscosities BFCs.

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Section: Introductionmentioning

confidence: 99%

Efficiency of polymerization of bulk-fill composite resins: a systematic review

et al. 2017

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“…27,28 When a polymer is densely crosslinked, the surface degradation by solvent can be reduced, and the resultant hardness also can be minimally affected. Intrinsic factors such as, monomer composition and combination and other resin ingredients, are controlled by manufacturers, but LCU type, light intensity, and curing time can be controlled by users.…”

Section: Discussionmentioning

confidence: 99%

Effect of 457 nm Diode-Pumped Solid State Laser on the Polymerization Composite Resins: Microhardness, Cross-Link Density, and Polymerization Shrinkage

Son

Park²,

Jung³

et al. 2015

Photomedicine and Laser Surgery

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Objective: The purpose of the present study was to test the usefulness of 457 nm diode-pumped solid state (DPSS) laser as a light source to cure composite resins. Materials and methods: Five different composite resins were light cured using three different light-curing units (LCUs): a DPSS 457 nm laser (LAS), a light-emitting diode (LED), and quartz-tungsten-halogen (QTH) units. The light intensity of LAS was 560 mW/cm 2 , whereas LED and QTH LCUs was *900 mW/cm 2 . The degree of polymerization was tested by evaluating microhardness, cross-link density, and polymerization shrinkage. Results: Before water immersion, the microhardness of laser-treated specimens ranged from 40.8 to 84.7 HV and from 31.7 to 79.0 HV on the top and bottom surfaces, respectively, and these values were 3.3-23.2% and 2.9-31.1% lower than the highest microhardness obtained using LED or QTH LCUs. Also, laser-treated specimens had lower top and bottom microhardnesses than the other LCUs treated specimens by 2.4-19.4% and 1.4-27.8%, respectively. After ethanol immersion for 24 h, the microhardness of laser-treated specimens ranged from 20.3 to 63.2 HV on top and bottom surfaces, but from 24.9 to 71.5 HV when specimens were cured using the other LCUs. Polymerization shrinkage was 9.8-14.7 lm for laser-treated specimens, and these were significantly similar or lower (10.2-16.0 lm) than those obtained using the other LCUs. Conclusions: The results may suggest that the 457 nm DPSS laser can be used as a light source for light-curing dental resin composites.

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“…Small variations in the intensity of the baseline were compensated for since the peak area was always calculated relative to the baseline of each individual spectrum. The DC was calculated by taking the peak area of the sample prior to the start of irradiation ( Area monomer ) and at each point during the polymerization process ( Area polymer ) based on the following formula [17, 23]:

D C = true(1 - \frac{A r e a_{p o l y m e r}}{A r e a_{m o n o m e r}} true) \times 100 %

…”

Section: Materials and Experiments ◆mentioning

confidence: 99%

Simultaneous measurement of polymerization stress and curing kinetics for photo-polymerized composites with high filler contents

et al. 2014

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Objectives Photopolymerized composites are used in a broad range of applications with their performance largely directed by reaction kinetics and contraction accompanying polymerization. The present study was to demonstrate an instrument capable of simultaneously collecting multiple kinetics parameters for a wide range of photopolymerizable systems: degree of conversion (DC), reaction exotherm, and polymerization stress (PS). Methods Our system consisted of a cantilever beam-based instrument (tensometer) that has been optimized to capture a large range of stress generated by lightly-filled to highly-filled composites. The sample configuration allows the tensometer to be coupled to a fast near infrared (NIR) spectrometer collecting spectra in transmission mode. Results Using our instrument design, simultaneous measurements of PS and DC are performed, for the first time, on a commercial composite with ≈ 80 % (by mass) silica particle fillers. The in situ NIR spectrometer collects more than 10 spectra per second, allowing for thorough characterization of reaction kinetics. With increased instrument sensitivity coupled with the ability to collect real time reaction kinetics information, we show that the external constraint imposed by the cantilever beam during polymerization could affect the rate of cure and final degree of polymerization. Significance The present simultaneous measurement technique is expected to provide new insights into kinetics and property relationships for photopolymerized composites with high filler content such as dental restorative composites.

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Polymerization development of “low-shrink” resin composites: Reaction kinetics, polymerization stress and quality of network

Cited by 64 publications

References 52 publications

Efficiency of polymerization of bulk-fill composite resins: a systematic review

Efficiency of polymerization of bulk-fill composite resins: a systematic review

Effect of 457 nm Diode-Pumped Solid State Laser on the Polymerization Composite Resins: Microhardness, Cross-Link Density, and Polymerization Shrinkage

Simultaneous measurement of polymerization stress and curing kinetics for photo-polymerized composites with high filler contents

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