Polymerization stresses in low-shrinkage dental resin composites measured by crack analysis

Takatsugu Yamamoto, Yu Kubota, Yasuko Momoi, Jack Ferracane

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Objective: The objective of this study was to compare several dental restoratives currently advertised as low-shrinkage composites (Clearfil Majesty Posterior, Kalore, Reflexions XLS Dentin and Venus Diamond) with a microfill composite (Heliomolar) in terms of polymerization stress, polymerization shrinkage and elastic modulus. Methods: Cracks were made at several distances from the edge of a precision cavity in a soda-lime glass disk. The composites were placed into the cavity and lengths of the cracks were measured before and after light curing. Polymerization stresses generated in the glass at 2 and 10 min after the irradiation were calculated from the crack lengths and K c of the glass. Polymerization shrinkage and elastic modulus of the composites also were measured at 2 and 10 min after irradiation using a video-imaging device and a nanoindenter, respectively. The data were statistically analyzed by ANOVAs and Tukey's test (p <0.05). Results: The stress was significantly affected by composite brand, distance and time. The stress was directly proportional to time and inversely proportional to distance from the edge of the cavity. Clearfil Majesty Posterior demonstrated the highest stress and it resulted in the fracture of the glass at 2 min. Venus Diamond and Heliomolar exhibited the greatest shrinkage at both times. The elastic moduli of Clearfil Majesty Posterior and Reflexions XLS Dentin were greatest at 2 and 10 min, respectively. Significance: Among the four low-shrinkage composites, two demonstrated significantly reduced polymerization stress compared to Heliomolar, which has previously been shown in in vitro tests to generate low curing stress.

Original languageEnglish (US)
JournalDental Materials
Volume28
Issue number9
DOIs
StatePublished - Sep 2012

Fingerprint

Polymerization
Resins
Glass
Elastic Modulus
Cracks
Venus
Composite materials
Diamond
Dentin
Elastic moduli
Curing
Diamonds
Irradiation
Analysis of Variance
Tooth
Analysis of variance (ANOVA)
Composite Dental Resin
Lime
Light
Equipment and Supplies

Keywords

  • Contraction
  • Crack
  • Dental composite
  • Polymerization
  • Stress

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Medicine(all)

Cite this

Polymerization stresses in low-shrinkage dental resin composites measured by crack analysis. / Yamamoto, Takatsugu; Kubota, Yu; Momoi, Yasuko; Ferracane, Jack.

In: Dental Materials, Vol. 28, No. 9, 09.2012.

Research output: Contribution to journalArticle

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