Critical configuration analysis of four methods for measuring polymerization shrinkage strain of composites

Ronald Sakaguchi, B. D. Wiltbank, N. C. Shah

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Objectives. To compare four methods for measuring polymerization shrinkage strain of composites and to develop a rational basis for comparing data from different methods and laboratories. Methods. Dilatometry, modified bonded disk, strain gage, and a new linear transducer method were used to measure polymerization shrinkage strain of a model composite under similar irradiation conditions. The resin consisted of an untinted resin (50:50 BISGMA/TEGDMA, 0.7% CQ, 0.35% DMAEM, 0.05% BHT) filled with 5% fumed silica and 67wt% untreated hybrid filler. Specimens (n=10) were exposed for 60 s at 600 mW/cm2 and then monitored for 300 s. Specimen volumes were 8 mm3 for the strain gage method, 25 mm3 for the linear transducer and dilatometer methods and 43 mm3 for the bonded disk method. The degree of constraint applied to the specimens by each method was calculated and compared. Shrinkage strain values at 60 and 300 s were tested for significance at p=0.05 using one-way ANOVA and Tukey's test. Results. Shrinkage strain magnitudes at 60 and 300 s for the four methods were significantly different (p

Original languageEnglish (US)
Pages (from-to)388-396
Number of pages9
JournalDental Materials
Volume20
Issue number4
DOIs
StatePublished - May 2004

Fingerprint

Polymerization
Composite materials
Strain gages
Transducers
Resins
Butylated Hydroxytoluene
Dilatometers
Analysis of variance (ANOVA)
Silicon Dioxide
Fillers
Silica
Irradiation
Analysis of Variance

Keywords

  • Boundary conditions
  • Composite
  • Constraint
  • Contraction
  • Dental material
  • Kinetics
  • Polymerization
  • Shrinkage
  • Strain

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Critical configuration analysis of four methods for measuring polymerization shrinkage strain of composites. / Sakaguchi, Ronald; Wiltbank, B. D.; Shah, N. C.

In: Dental Materials, Vol. 20, No. 4, 05.2004, p. 388-396.

Research output: Contribution to journalArticle

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