Effect of energy density on low-shrinkage composite resins: Diode-pumped solid state laser versus quartz-tungsten-halogen light-curing unit

Young Joon Heo, Geun Ho Lee, Jeong Kil Park, Jung Hoon Ro, Franklin Garcia-Godoy, Hyung Il Kim, Yong Hoon Kwon

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objective: The purpose of the present study was to evaluate the effect of energy density on the polymerization of low-shrinkage composite resins. Background data: The number of photons needs to initiate the polymerization process can be controlled by light intensity and curing time through the form of energy density. Materials and methods: For the study, two methacrylate-based (Premise [PR] and Venus Diamond [VE]) and one silorane-based (Filtek LS [LS]) composite resins were light cured using a quartz-tungsten-halogen (QTH) light-curing unit (LCU) and a 473nm diode-pumped solid state (DPSS) laser. Degree of conversion (DC), microhardness, refractive index, and polymerization shrinkage were evaluated under different energy densities. Through the study, the feasibility of DPSS laser as a light source was tested as well. Results: LS showed the highest DC and refractive index both on the top and bottom surfaces, and the least polymerization shrinkage among the tested specimens. For the same or similar energy density, QTH and DPSS showed insignificant DC difference (p>0.05). On the other hand, for microhardness, except for one case at the bottom surface, QTH and DPSS showed significant difference (p<0.001). DPSS generated slightly lower polymerization shrinkage than that by QTH. Conclusions: DC, microhardness, refractive index, and polymerization shrinkage were linearly correlated with energy density. In most cases, there was a strong linear correlation among DC, mirohardness, and refractive index. The DPSS laser of 473nm could polymerize low-shrinkage composite resins to the level that was achieved by the conventional QTH unit.

Original languageEnglish (US)
Pages (from-to)28-35
Number of pages8
JournalPhotomedicine and Laser Surgery
Volume31
Issue number1
DOIs
StatePublished - Jan 1 2013

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Tungsten
Quartz
Halogens
Composite Resins
Solid state lasers
Solid-State Lasers
Polymerization
Curing
Refractometry
Diodes
Resins
Light
Refractive index
Composite materials
Microhardness
Venus
Diamond
Methacrylates
Photons
Light sources

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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Effect of energy density on low-shrinkage composite resins : Diode-pumped solid state laser versus quartz-tungsten-halogen light-curing unit. / Heo, Young Joon; Lee, Geun Ho; Park, Jeong Kil; Ro, Jung Hoon; Garcia-Godoy, Franklin; Kim, Hyung Il; Kwon, Yong Hoon.

In: Photomedicine and Laser Surgery, Vol. 31, No. 1, 01.01.2013, p. 28-35.

Research output: Contribution to journalArticle

Heo, Young Joon ; Lee, Geun Ho ; Park, Jeong Kil ; Ro, Jung Hoon ; Garcia-Godoy, Franklin ; Kim, Hyung Il ; Kwon, Yong Hoon. / Effect of energy density on low-shrinkage composite resins : Diode-pumped solid state laser versus quartz-tungsten-halogen light-curing unit. In: Photomedicine and Laser Surgery. 2013 ; Vol. 31, No. 1. pp. 28-35.
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AB - Objective: The purpose of the present study was to evaluate the effect of energy density on the polymerization of low-shrinkage composite resins. Background data: The number of photons needs to initiate the polymerization process can be controlled by light intensity and curing time through the form of energy density. Materials and methods: For the study, two methacrylate-based (Premise [PR] and Venus Diamond [VE]) and one silorane-based (Filtek LS [LS]) composite resins were light cured using a quartz-tungsten-halogen (QTH) light-curing unit (LCU) and a 473nm diode-pumped solid state (DPSS) laser. Degree of conversion (DC), microhardness, refractive index, and polymerization shrinkage were evaluated under different energy densities. Through the study, the feasibility of DPSS laser as a light source was tested as well. Results: LS showed the highest DC and refractive index both on the top and bottom surfaces, and the least polymerization shrinkage among the tested specimens. For the same or similar energy density, QTH and DPSS showed insignificant DC difference (p>0.05). On the other hand, for microhardness, except for one case at the bottom surface, QTH and DPSS showed significant difference (p<0.001). DPSS generated slightly lower polymerization shrinkage than that by QTH. Conclusions: DC, microhardness, refractive index, and polymerization shrinkage were linearly correlated with energy density. In most cases, there was a strong linear correlation among DC, mirohardness, and refractive index. The DPSS laser of 473nm could polymerize low-shrinkage composite resins to the level that was achieved by the conventional QTH unit.

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