J Korean Acad Conserv Dent.  2004 Nov;29(6):504-514. 10.5395/JKACD.2004.29.6.504.

Dentin bond strength of bonding agents cured with light emitting diode

Affiliations
  • 1Department of Conservative Dentistry, College of Dentistry, Seoul National University, Korea. umcmoon@snu.ac.kr

Abstract

This study compared the dentin shear bond strengths of currently used dentin bonding agents that were irradiated with an LED (Elipar FreeLight, 3M-ESPE) and a halogen light (VIP, BISCO). The optical characteristics of two light curing units were evaluated. Extracted human third molars were prepared to expose the occlusal dentin and the bonding procedures were performed under the irradiation with each light curing unit. The dentin bonding agents used in this study were Scotchbond Multipurpose (3M ESPE), Single Bond (3M ESPE), One-Step (Bisco), Clearfil SE bond (Kuraray), and Adper Prompt (3M ESPE). The shear test was performed by employing the design of a chisel-on-iris supported with a Teflon wall. The fractured dentin surface was observed with SEM to determine the failure mode. The spectral appearance of the LED light curing unit was different from that of the halogen light curing unit in terms of maximum peak and distribution. The LED LCU (maximum peak in 465 nm) shows a narrower spectral distribution than the halogen LCU (maximum peak in 487 nm). With the exception of the Clearfil SE bond (P < 0.05), each 4 dentin bonding agents showed no significant difference between the halogen light-cured group and the LED light-cured group in the mean shear bond strength (P > 0.05). The results can be explained by the strong correlation between the absorption spectrum of camphoroquinone and the narrow emission spectrum of LED.

Keyword

LED; Halogen; Dentin bonding agent; Dentin shear bond strength; Spectrum; Camphoroquinone

MeSH Terms

Absorption
Dentin*
Dentin-Bonding Agents
Humans
Molar, Third
Polytetrafluoroethylene
Dentin-Bonding Agents
Polytetrafluoroethylene

Figure

  • Figure 1. Schematic diagram of the shear bond strength test used in this study. Embedding resin Teflon-coated metal iris Teflon wall Composite Load application chisel

  • Figure 2. Spectral distributions of the two LCUs.

  • Figure 3. Spectral intensity of two LCUs used in this study.

  • Figure 4. The failure mode.

  • Figure 5. Adhesive failure.

  • Figure 6. Mixed failure; adhesive failure + cohesive failure within the DBA.

  • Figure 7. Partially cohesive failure within the composite.


Cited by  1 articles

Effect of infection control barrier thickness on light curing units
Hoon-Sang Chang, Seok-Ryun Lee, Sung-Ok Hong, Hyun-Wook Ryu, Chang-Kyu Song, Kyung-San Min
J Korean Acad Conserv Dent. 2010;35(5):368-373.    doi: 10.5395/JKACD.2010.35.5.368.


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