Role of filler and functional group conversion in the evolution of properties in polymeric dental restoratives

Shah, Parag K.; Stansbury, Jeffrey W.

doi:10.1016/j.dental.2014.02.015

Cited by 88 publications

(62 citation statements)

References 45 publications

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“…Many studies have found that the rigidity of the material has an effect on the stress produced as a result of polymerization. In addition, the elastic modulus was found to negatively relate to the polymerization strain [13,27,[73][74][75]. Interestingly, in this study there was no correlation between the elastic modulus and the polymerization strain and polymerization stress.…”

Section: Discussioncontrasting

confidence: 54%

“…The stress results seem to follow the same pattern of the modulus of elasticity despite the lack of correlation [75]. The differences in the material behavior with the regard to the polymerization strain, polymerization kinetics, polymerization stress and modulus of elasticity could be explained by the fact that the differences in the monomer system is covered up by many other differences in the material composition d e n t a l m a t e r i a l s x x x ( 2 0 1 6 ) xxx-xxx such as the filler amount and type, initiator, silanization.…”

Section: Discussionmentioning

confidence: 69%

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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: Discussioncontrasting

confidence: 54%

Section: Discussionmentioning

confidence: 69%

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

2016

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“…filler content ( i.e. PS decreased with increasing filler content) was reported when the PS was measured using relatively compliant instruments [9–11]. …”

Section: Introductionmentioning

confidence: 99%

System compliance dictates the effect of composite filler content on polymerization shrinkage stress

Wang

Chiang

2016

Dental Materials

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Objective The effect of filler content in dental restorative composites on the polymerization shrinkage stress (PS) is not straightforward and has caused much debate in the literature. Our objective in this study was to clarify the PS/filler content relationship based on analytical and experimental approaches, so that guidelines for materials comparison in terms of PS and clinical selection of dental composites with various filler content can be provided. Methods Analytically, a simplified model based on linear elasticity was utilized to predict PS as a function of filler content under various compliances of the testing system, a cantilever beam-based instrument used in this study. The predictions were validated by measuring PS of composites synthesized using 50/50 mixtures of two common dimethacrylate resins with a variety of filler contents. Results Both experiments and predictions indicated that the influence of filler content on the PS highly depended on the compliance of the testing system. Within the clinic-relevant range of compliances and for the specific sample configuration tested, the PS increased with increasing filler content at low compliance of instrument, while increasing the compliance caused the effect of filler content on the PS to gradually diminish. Eventually, at high compliance, the PS inverted and decreased with increasing filler content. Significance This compliance-dependent effect of filler content on PS suggests: (1) for materials comparison in terms of PS, the specific compliance at which the comparison being done should always be reported and (2) clinically, composites with relatively lower filler content could be selected for such cavities with relatively lower compliance (e.g. a Class-I cavity with thick tooth walls or the basal part in a cavity) and vice versa in order to reduce the final PS.

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“…This relationship is essentially linear. This phenomenon has been reported many times, including very recently in a systematic study in which filler volume was varied and DC and shrinkage were measured [14].…”

Section: Degree Of Cure and Shrinkagementioning

confidence: 99%

Microstructural Features of Current Resin Composite Materials

Ferracane

Pfeifer

Hilton

2014

Curr Oral Health Rep

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Dental resin composites have become the primary choice of most practitioners for the direct restoration of teeth owing to their esthetics and properties, both of which are highly dependent upon the microstructure of the materials. The type, size, amount, and distribution of the reinforcing fillers are all critical determinants of the optical and physical properties of the composite. The chemistry of the resin monomers and the quality of the highly cross-linked network formed during the polymerization reaction significantly influences these properties. Finally, the transfer of stress from the weaker resin matrix to the stronger and stiffer reinforcing fillers is accomplished by ensuring a strong interfacial linkage between the two phases, typically via a silane coupling agent. Recent work characterizing and describing the influence of the microstructure of dental composites on their properties and performance are reviewed in this manuscript.

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Role of filler and functional group conversion in the evolution of properties in polymeric dental restoratives

Cited by 88 publications

References 45 publications

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

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

System compliance dictates the effect of composite filler content on polymerization shrinkage stress

Microstructural Features of Current Resin Composite Materials

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