Calculation of contraction rates due to shrinkage in light-cured composites

Álvarez-Gayosso, Carlos; Barceló-Santana, Federico; Guerrero-Ibarra, Jorge; Sáez-Espı́nola, Gabriel; Canseco-Martı́nez, Miguel A

doi:10.1016/s0109-5641(03)00097-6

Cited by 68 publications

(35 citation statements)

References 34 publications

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“…This could be due to the wide range of material tested from different groups which makes it difficult to isolate the effect of the polymerization rate on the stress generation. Several factors contribute to the amount of stress generation besides the polymerization kinetics, including the conversion kinetics which is closely affected by the material chemical composition [20,38,[55][56][57]. Moreover, some materials develop elastic modulus at a low conversion which means that even at a low reaction rate there is no further plastic deformation and the stress starts to build up [18,20,58].…”

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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“…Based on these compositional data, the bonding surface of ER DentinPost thus had a lower content of epoxy resin matrix, which might reduce micromechanical and Moreover, flowable composite resins have a lower filler-resin ratio than conventional composite resins 17,22,23) . It has been reported that composite resins with higher filler content reveal lower polymerization shrinkage [24][25][26] . On the other hand, a higher content of resin may lead to increased contraction during polymerization, whereby stress from shrinkage strain could weaken the interfacial bonds, thus affecting the bond strength to the post surface 11) .…”

Section: Discussionmentioning

confidence: 99%

Influence of Adhesive Systems on Bond Strength between Fiber Posts and Composite Resin Cores in a Pull-out Test Design

et al. 2007

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The aim of this study was to evaluate the effects of post surface conditioning with adhesive systems on tensile bond strength between two composite resin core systems and FRP posts (ER DentinPost). Forty-eight posts were trimmed at the coronal part, and the upper part of 3 mm was covered with a standardized composite resin core build-up. Twenty-four posts were treated with the respective adhesive systems. Four groups were formed: G1 -ClearfilCore; G2 -Clearfil New Bond ＋ ClearfilCore; G3 -MultiCore Flow; and G4 -AdheSE ＋ MultiCore Flow. Mean (SD) bond strengths in MPa were 7.53 (0.89) for ClearfilCore and 8.08 (0.93) for New Bond ＋ ClearfilCore; 5.80 (0.39) for MultiCore Flow and 5.92 (0.43) for AdheSE ＋ MultiCore Flow. ClearfilCore achieved significantly higher bond strengths than MultiCore Flow (two-way ANOVA; p<0.0001). In conclusion, composite resin core materials exerted a significant influence on tensile bond strength, while adhesive systems did not significantly affect the results.

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“…The materials used in this study were chosen on the basis of common clinical use and a spectrum of polymerisation shrinkage values previously reported in the literature [20,21]. Furthermore, a new experimenal low shrinking material based on silorane chemistry was compared to conventional dimethacrylate resins.…”

Section: Espi Experimentsmentioning

confidence: 99%

Dynamics of composite polymerization mediates the development of cuspal strain

et al. 2006

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d e n t a l m a t e r i a l s 2 2 ( 2 0 0 6 ) 896-902 a v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / d e m a Objectives. In the current study, we used electronic speckle pattern interferometry (ESPI) to measure tooth deformation in response to polymerization of five resin composites with a range of polymerization shrinkage. Our hypothesis was that composites with higher polymerization shrinkage should cause more cuspal strain as measured by ESPI.Methods. Standardized MOD cavities were prepared and placed into the ESPI apparatus before the cavities were filled with composites (n = 10). The ESPI apparatus was constructed to measure the out-of-plane displacement of the lingual cusps of the teeth during the polymerization of the restorative material. A thermocouple was attached to the specimen to monitor thermal changes throughout the polymerization process. Results. Experiments with empty preparations demonstrated that the ESPI technique wastemporally responsive and sensitive to dimensional changes. However, the correlation between polymerization shrinkage of composite resins and ESPI-measured tooth deformation was not straightforward. In particular, a flowable material did not deform the tooth significantly more that a conventional hybrid. Further, an experimental silorane material (with the lowest axial shrinkage) induced the least tooth deformation.Significance. We concluded that ESPI is a viable method for assessing cuspal strain induced by shrinkage of bonded composite restorations, but that polymerization shrinkage data may overestimate shrinkage-induced tooth deformation. The rate of polymerization shrinkage appeared to mediate the development of cuspal strain.

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Calculation of contraction rates due to shrinkage in light-cured composites

Cited by 68 publications

References 34 publications

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

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

Influence of Adhesive Systems on Bond Strength between Fiber Posts and Composite Resin Cores in a Pull-out Test Design

Dynamics of composite polymerization mediates the development of cuspal strain

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