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Dent Mater. 2019 Nov;35(11):1654-1664. doi: 10.1016/j.dental.2019.08.116. Epub 2019 Sep 22.

Polymerization shrinkage of resin-based composites for dental restorations: A digital volume correlation study.

Author information

1
University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France.
2
Laboratoire des Multimateriaux et Interfaces, UMR CNRS 5615, Universite Lyon 1, Villeurbanne, France.
3
Laboratoire des Multimateriaux et Interfaces, UMR CNRS 5615, Universite Lyon 1, Villeurbanne, France; UFR d'odontologie, Université Paris Diderot, APHP, Hôpital Rothschild, Service d'odontologie, Paris, France.
4
University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France. Electronic address: eric.maire@insa-lyon.fr.

Abstract

OBJECTIVE:

Resin-based composites are widely used in dental restorations; however, their volumetric shrinkage during polymerization leads to several issues that reduce the restoration survival rates. For overcoming this problem, a deep study of shrinkage phenomena is necessary.

METHODS:

In this study, micro-tomography (μ-CT) is combined with digital volume correlation (DVC) to investigate the effect of several factors on the polymerization strain of dental composites in model cavities: the presence/absence of an adhesive, the use of transparent/blackened cavities, and irradiation times between 1 and 40s.

RESULTS:

The results indicate that the presence of an adhesive at the interface between the cavity and composite does not reduce the total strain but instead limits it to a preferential direction. In addition, regardless of the conditions, the main strain is generated along the axis parallel to the polymerization irradiation (the vertical axis). Finally, the total strain appears to occur in the first 5s of irradiation, with no further evolution observed for longer irradiation times.

SIGNIFICANCE:

This work provides new insight into resin-based composite shrinkage and demonstrates the benefit of coupling DVC and μ-CT to better understand the degradation mechanisms of these materials.

KEYWORDS:

Adhesion; Digital volume correlation; In situ tests; Micro-tomography; Polymerization shrinkage; Strain

PMID:
31554599
DOI:
10.1016/j.dental.2019.08.116
[Indexed for MEDLINE]

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