Effects of single-peak vs polywave light-emitting diode curing lights on the polymerization of resin cement

J Adhes Dent. 2013 Dec;15(6):547-51. doi: 10.3290/j.jad.a29634.

Abstract

Purpose: This study examined the effect of selecting a single-peak blue vs a polywave blue/violet emission LED curing light on the degree of conversion (DC) and Knoop microhardness (KHN) of resin cements when light cured through a ceramic disk.

Materials and methods: Two shades (A1 and A4) of resin cement (Variolink II) were placed in a 0.5-mm-thick ring. The top surfaces were covered with a Mylar strip and further covered with a disk of 1-mm-thick Empress Esthetic ceramic, shade A2. The specimens were light cured by means of an Elipar-S10 (3M ESPE, single-peak blue LED) or BluePhase-G2 (Ivoclar Vivadent, polywave blue/violet LED) curing light, both for 20 s, directly on the surface of an attenuated total reflectance FT-IR plate at 30°C. The DC of the resin was calculated after 100 s. The specimens were removed, and the Knoop microhardness was tested immediately and again after 24-h storage in the dark at 37°C and 100% humidity. Five specimens were made in each group. The DC and Knoop microhardness results were analyzed with ANOVA and Fisher's PLSD at α = 0.05.

Results: The choice of curing light had no significant effect on the DC and only a small effect on the immediate and 24-h KHN values. Shade A4 of the resin cement was harder and had a higher DC than shade A1.

Conclusion: When light cured for 20 s, Variolink II resin cement can be light cured with either the single-peak or the polywave curing light. Shade A4 of the cement was slightly harder than A1.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aluminum Silicates / chemistry
  • Color
  • Curing Lights, Dental / classification*
  • Darkness
  • Dental Porcelain / chemistry
  • Hardness
  • Humans
  • Humidity
  • Light-Curing of Dental Adhesives / instrumentation
  • Light-Curing of Dental Adhesives / methods
  • Materials Testing
  • Optical Fibers
  • Polymerization
  • Resin Cements / chemistry*
  • Spectroscopy, Fourier Transform Infrared
  • Surface Properties
  • Temperature
  • Time Factors

Substances

  • Aluminum Silicates
  • IPS-Empress ceramic
  • Resin Cements
  • Dental Porcelain
  • leucite
  • Variolink