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

Dental Materials : Official Publication of the Academy of Dental Materials
Takatsugu YamamotoJack L Ferracane

Abstract

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. 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). 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 Dia...Continue Reading

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Citations

Apr 8, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·D C Watts, A Alnazzawi
Jul 16, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Lilyan C YamasakiCarmem S Pfeifer
Jan 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Zhongpu ZhangMichael V Swain
Jul 30, 2015·Dental Materials : Official Publication of the Academy of Dental Materials·Jack L Ferracane, Thomas J Hilton
Apr 10, 2015·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Takatsugu YamamotoRonald L Sakaguchi
Aug 20, 2016·Odontology·Dalia Kaisarly, Moataz El Gezawi
Dec 5, 2019·Brazilian Oral Research·Tatiana Kelly da Silva FidalgoLucianne Cople Maia

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