Effect of irradiance and exposure duration on temperature and degree of conversion of dual-cure resin cement for ceramic restorations

Ji Suk Shim, Seok Hwan Han, Nayansi Jha, Sung Taek Hwang, Woobeam Ahn, Jeong Yol Lee, Jae Jun Ryu

Research output: Contribution to journalArticle

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Abstract

This study investigated the effects of irradiance and exposure duration on dual-cured resin cements irradiated through ceramic restorative materials. A single light-curing unit was calibrated to three different irradiances (500, 1000, and 1500 mW/cm2) and irradiated to three different attenuating materials (transparent acryl, lithium disilicate, zirconia) with 1-mm thicknesses for 20 or 60 seconds. The changes in irradiance and temperature were measured with a radiometer (or digital thermometer) under the attenuating materials. The degree of conversion (DC) of dual-cure resin cement after irradiation at different irradiances and exposure durations was measured with Fourier transform near infrared spectroscopy. Two-way analysis of variance revealed that irradiance (p,0.001) and exposure duration (p,0.001) significantly affected temperature and DC. All groups showed higher DCs with increased exposure times (p,0.05), but there were no statistically significant differences between the groups irradiated with 1000 mW/cm2 and 1500 mW/cm2 (p.0.05). Higher-intensity irradiances yielded higher temperatures (p,0.05), but exposure time did not affect temperature when materials were irradiated at 500 mW/cm2 (p.0.05).

Original languageEnglish
Pages (from-to)E280-E287
JournalOperative Dentistry
Volume43
Issue number6
DOIs
Publication statusPublished - 2018 Nov 1

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Ceramics
Temperature
Resin Cements
Thermometers
Near-Infrared Spectroscopy
Fourier Transform Infrared Spectroscopy
Analysis of Variance
Light
DCR cement

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Effect of irradiance and exposure duration on temperature and degree of conversion of dual-cure resin cement for ceramic restorations. / Shim, Ji Suk; Han, Seok Hwan; Jha, Nayansi; Hwang, Sung Taek; Ahn, Woobeam; Lee, Jeong Yol; Ryu, Jae Jun.

In: Operative Dentistry, Vol. 43, No. 6, 01.11.2018, p. E280-E287.

Research output: Contribution to journalArticle

Shim, Ji Suk ; Han, Seok Hwan ; Jha, Nayansi ; Hwang, Sung Taek ; Ahn, Woobeam ; Lee, Jeong Yol ; Ryu, Jae Jun. / Effect of irradiance and exposure duration on temperature and degree of conversion of dual-cure resin cement for ceramic restorations. In: Operative Dentistry. 2018 ; Vol. 43, No. 6. pp. E280-E287.
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