Shrinkage assessment of low shrinkage composites using micro-computed tomography

Ronaldo Hirata, Emanuele Clozza, Marcelo Giannini, Ehsan Farrokhmanesh, Malvin Janal, Nick Tovar, Estevam A. Bonfante, Paulo G. Coelho

Research output: Contribution to journalArticle

Abstract

Objectives: The aim of this study was to quantify the polymerization volumetric shrinkage of one regular and two low shrinkage bulk fill composites in class I cavities with or without an adhesive layer, using three-dimensional (3D) micro-computed tomography (μCT). Methods: Class I cavity preparations (2.5 mm depth × 4 mm length × 4 mm wide) were standardized in 36 extracted human third molars, which were randomly divided in six groups (n = 6 each) as follows: Group VIT (regular composite without bonding agent); Group SDR (low shrinkage flowable composite without bonding agent); Group TET (low shrinkage composite without bonding agent); Group VIT/P (regular composite with bonding agent); Group SDR/X (low shrinkage flowable composite with bonding agent); TET/T (low shrinkage composite with bonding agent). Each tooth was scanned via μCT at cavity preparation, immediately after cavity filling, and after light-curing. Acquired μCT data were imported into Amira software for analysis and volume values evaluated between steps from cavity preparation until light-curing. Results: Both low shrinkage composites showed a significantly less volumetric shrinkage than VIT. The use of dental adhesive significantly decreased the average volumetric contraction similarly for the three composites, by about 20%. Conclusion: Both low shrinkage composites showed less volumetric polymerization contraction than the regular composite. The use of dental adhesive decreased the total volumetric shrinkage for all evaluated composites.

Original languageEnglish (US)
Pages (from-to)798-806
Number of pages9
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume103
Issue number4
DOIs
StatePublished - May 1 2015

Keywords

  • 3D imaging
  • composite resins
  • polymerization
  • volume shrinkage
  • x-ray micro-computed tomography

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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