Calculation of contraction stresses in dental composites by analysis of crack propagation in the matrix surrounding a cavity

Yamamoto, Takatsugu; Ferracane, Jack L.; Sakaguchi, Ronald L.; Swain, Michael V.

doi:10.1016/j.dental.2008.10.008

Cited by 39 publications

(39 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, the elastic modulus of the material plays an important role in the generation of stress during polymerization. As the material continues to polymerize the modulus of elasticity starts to develop and generates stresses within the material [44][45][46].…”

Section: Discussionmentioning

confidence: 99%

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

2016

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

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

2016

View full text Add to dashboard Cite

show abstract

“…The method has clinical relevance for investigating enamel cracks near the margins and the formation of contraction gaps. 29 …”

Section: Crack Propagation In a Glass Cavitymentioning

confidence: 99%

“…A limitation of this method is the recommended distance between the cavity limit and the indentation required to avoid chipping of the cavity edge during indentation. 29 This method for calculating the stresses is a relatively simple technique requiring a conventional hardness tester. The method has clinical relevance for investigating enamel cracks near the margins and the formation of contraction gaps.…”

Section: Crack Propagation In a Glass Cavitymentioning

confidence: 99%

“…After calculating the stress at the crack site and the distance between the indentation and cavity margin, radial tensile stresses are calculated at the bonded interface. 25,29,30 Crack analysis has been used to calculate residual stresses produced by different photo activation methods 29 and at different distances from the restoration margin. 30 Braga et al, 25 demonstrated that this method was effective for ranking composites according to their polymerization stress development.…”

Section: Crack Propagation In a Glass Cavitymentioning

confidence: 99%

“…29,30 The cavity is prepared in glass-ceramic rods or soda-lime glass discs, materials with elastic modulus and fracture toughness similar to human enamel. After calculating the stress at the crack site and the distance between the indentation and cavity margin, radial tensile stresses are calculated at the bonded interface.…”

Section: Crack Propagation In a Glass Cavitymentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Polymerization Shrinkage Stress

Schneider

Moraes

2017

Dental Composite Materials for Direct Restorations

View full text Add to dashboard Cite

Calculation of contraction stresses in dental composites by analysis of crack propagation in the matrix surrounding a cavity

Cited by 39 publications

References 35 publications

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

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

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

Polymerization Shrinkage Stress

Contact Info

Product

Resources

About