The effect of post-cure heating on residual, unreacted monomer in a commercial resin composite

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Objectives. This paper examined the influence of post-cure temperature on the amount of unreacted monomer remaining in a commercial light-cured resin composite restoration following initial light-curing and subsequent post-cure heating. Methods. Discs of composite were light-cured and then subjected to immediate post-cure heating (50, 75, 100, or 125°C for 7 min) or were left unheated (control). They were then placed in a solvent for two weeks at 37°C to extract the unreacted monomer. HPLC analysis was used to determine the amounts of TEGDMA, BIS-GMA, and ethoxylated BIS-GMA remaining after the different treatments. The amounts of each monomer leaching were compared using ANOVA with respect to the different curing treatments. Results. Even the lowest post-cure heat treatment (50°C) resulted in 80% reduction in remaining, unreacted TEGDMA, 75% reduction in BIS-GMA, and 77% lower ethoxylated BIS-GMA than the light-cured only control. Post-cure heating at 75°C and above resulted in the lowest amount of each type monomer remaining uncured in the polymer and did not significantly decrease with an increase in post-cure temperature for the most part. Significance. One of the main benefits of post-cure heating of resin composite restorations could be the enhancement of biocompatibility of these restorations as a result of the significant decrease in potentially leachable, unreacted monomer.

Original languageEnglish (US)
Pages (from-to)244-247
Number of pages4
JournalDental Materials
Volume16
Issue number4
DOIs
StatePublished - Jan 1 2000

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Composite Resins
Heating
Resins
Monomers
Light
Composite materials
Restoration
Curing
Temperature
Analysis of Variance
Polymers
Analysis of variance (ANOVA)
Biocompatibility
Hot Temperature
High Pressure Liquid Chromatography
Leaching
Heat treatment
triethylene glycol dimethacrylate

Keywords

  • Post-cure heating
  • Resin composite
  • Unreacted monomer

ASJC Scopus subject areas

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

Cite this

The effect of post-cure heating on residual, unreacted monomer in a commercial resin composite. / Bagis, Y. H.; Rueggeberg, Frederick.

In: Dental Materials, Vol. 16, No. 4, 01.01.2000, p. 244-247.

Research output: Contribution to journalArticle

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AB - Objectives. This paper examined the influence of post-cure temperature on the amount of unreacted monomer remaining in a commercial light-cured resin composite restoration following initial light-curing and subsequent post-cure heating. Methods. Discs of composite were light-cured and then subjected to immediate post-cure heating (50, 75, 100, or 125°C for 7 min) or were left unheated (control). They were then placed in a solvent for two weeks at 37°C to extract the unreacted monomer. HPLC analysis was used to determine the amounts of TEGDMA, BIS-GMA, and ethoxylated BIS-GMA remaining after the different treatments. The amounts of each monomer leaching were compared using ANOVA with respect to the different curing treatments. Results. Even the lowest post-cure heat treatment (50°C) resulted in 80% reduction in remaining, unreacted TEGDMA, 75% reduction in BIS-GMA, and 77% lower ethoxylated BIS-GMA than the light-cured only control. Post-cure heating at 75°C and above resulted in the lowest amount of each type monomer remaining uncured in the polymer and did not significantly decrease with an increase in post-cure temperature for the most part. Significance. One of the main benefits of post-cure heating of resin composite restorations could be the enhancement of biocompatibility of these restorations as a result of the significant decrease in potentially leachable, unreacted monomer.

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