Polymerization shrinkage of methacrylate esters

Patel, Mukesh R.; Braden, M.; Davy, K. W. M.

doi:10.1016/0142-9612(87)90030-5

Cited by 249 publications

(153 citation statements)

References 6 publications

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“…A possible explanation could be the differences in the conversion level of these materials. The close relationship between the degree of conversion and the shrinkage makes all the parameter that controls the degree of conversion affect the shrinkage such as the monomer reactivity and the network formation [47,48]. GSO is nano-hybrid flowable material that contains TEGDMA in its monomer system.…”

Section: Discussionmentioning

confidence: 99%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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Shrinkage-strainShrinkage-stress Strain rate Modulus of elasticity Bulk-fill a b s t r a c tObjectives. To investigate a set of resin-composites and the effect of their composition on polymerization shrinkage strain and strain kinetics, shrinkage stress and the apparent elastic modulus.Methods. Eighteen commercially available resin-composites were investigated. Three specimens (n = 3) were made per material and light-cured with an LED unit (1200 mW/cm 2 ) for 20 s. The bonded-disk method was used to measure the shrinkage strain and Bioman shrinkage stress instrument was used to measure shrinkage stress. The shrinkage strain kinetics at 23 • C was monitored for 60 min. Maximum strain and stress was evaluated at 60 min. The shrinkage strain rate was calculated using numerical differentiation. Significance. The nature of the monomer system determines the amount of the bulk contraction that occurs during polymerization and the resultant stress. Higher values of shrinkage strain and stress were demonstrated by the investigated flowable materials. The bulk-fill materials showed comparable result when compared to the traditional resin-composites.

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Section: Discussionmentioning

confidence: 99%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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“…[26] Several studies confirmed that shrinkage is related to conversion for non-vitrifying systems. [34][35][36] The glass transition temperature T g being equal to 9 8C [26] for the HBP and the composites independent of composition, the present systems indeed did not vitrify. The average shrinkage determined from the reduction in step height of the polymer grating with respect to the master step height (4.3 AE 1.3%) was equal within experimental scatter to the linear shrinkage measured on flat films (4.6 AE 0.5%).…”

Section: Gelationmentioning

confidence: 99%

Nanoimprint Lithography with UV‐Curable Hyperbranched Polymer Nanocomposites

Geiser

Jin

Leterrier

2010

Macromolecular Symposia

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Summary: Nano-scale patterns were produced with UV-curable acrylated hyperbranched polymer nanocomposites using nanoimprint lithography with a glass master in a rapid, low-pressure process. The pattern of the glass master was replicated with composites containing up to 25 vol% SiO 2 with a shape fidelity better than 98%. Photo-rheology, interferometry and atomic force microscopy were used to analyze the material behavior. Attention was paid to the relationship between composition, nanoparticle dispersion, kinetics of photo-polymerisation, shrinkage, pressure and shape fidelity of nano-gratings. It was shown that the gel-point of the nanocomposite was an important factor that determined the stability as well as the dimensions of the imprinted structure. Dimensional accuracy also strongly depended on the level of internal stress, which in fact increased with the amount of silica. A resin rich layer on the surface of the composite accounted for the good surface quality of the nano-pattern.

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“…In the case of the ringopening monomers, the rationale for decreased shrinkage is their inherent lower molar shrinkage coefficient in comparison with methacrylates. 74,75 This means that for equivalent initial volume and final degree of conversion, the monomer with the lower molar shrinkage coefficient will present less macroscopic shrinkage. 74,75 Similarly, the higher the molecular weight of a single monomer unit, the less the shrinkage observed because for a given volume, there is less free volume among the higher molecular weight monomers to begin with, so the final volumetric shrinkage is less.…”

Section: Modifications In the Restorative Composite Formulationmentioning

confidence: 99%

“…74,75 This means that for equivalent initial volume and final degree of conversion, the monomer with the lower molar shrinkage coefficient will present less macroscopic shrinkage. 74,75 Similarly, the higher the molecular weight of a single monomer unit, the less the shrinkage observed because for a given volume, there is less free volume among the higher molecular weight monomers to begin with, so the final volumetric shrinkage is less. 76 Pre-polymerized additives, such as nanogels, can also be used to decrease shrinkage of restorative composites, as they reduce the initial concentration of available functional groups to react.…”

Section: Modifications In the Restorative Composite Formulationmentioning

confidence: 99%

Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

et al. 2017

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Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with postoperative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations. Therefore, an indirect correlation can emerge between shrinkage stress and the longevity of composite restorations or resin-bonded ceramic restorations. The relationship between shrinkage and stress can be best studied in laboratory experiments and a combination of various methodologies. The objective of this review article is to discuss the concept and consequences of polymerization shrinkage and shrinkage stress of composite resins and resin cements. Literature relating to polymerization shrinkage and shrinkage stress generation, research methodologies, and contributing factors are selected and reviewed. Clinical techniques that could reduce shrinkage stress and new developments on low-shrink dental materials are also discussed.

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Polymerization shrinkage of methacrylate esters

Cited by 249 publications

References 6 publications

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Nanoimprint Lithography with UV‐Curable Hyperbranched Polymer Nanocomposites

Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

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