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Diode-pumped solid-state laser for bonding orthodontic brackets: effect of light intensity and light-curing time

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Abstract

This study evaluated the shear bond strength (SBS) of orthodontic brackets bonded to teeth using a diode-pumped solid state (DPSS) laser of 473 nm with various light intensity and light-curing settings. For the study, a total of 150 extracted human teeth were divided into ten groups. In the control group, the brackets were bonded to the teeth using a quartz-tungsten-halogen (QTH) light with an intensity of 900 mW/cm2. In the experimental groups, the brackets were bonded using a DPSS laser with three different light intensities and light-curing times. The same bracket type and adhesive were used in all groups throughout the study. Statistical analysis was performed to compare the SBS, and adhesive remnant index (ARI) among the groups. As results, brackets bonded using the DPSS laser with an intensity of 700 mW/cm2 for 40 s (totally) showed a slightly higher SBS (12.2 ± 1.8 MPa) than that of those bonded using a QTH light (control; 11.6 ± 1.6 MPa). The SBS values linearly increased with increasing energy density (light intensity × light-curing time) of the DPSS laser (R = 0.95, p < 0.001). However, the SBS values among the test groups were similar regardless of the difference in light-curing conditions. A comparison of the ARI scores among the groups suggested a similar bracket failure mode.

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Acknowledgments

The authors thank OSTEM IMPLANT for allowing the use of the universal testing machine.

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Authors and Affiliations

  1. Department of Dental Materials, School of Dentistry and Medical Research Institute, Pusan National University, Yangsan, 626-870, Korea

    Yong Hoon Kwon

  2. Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan, 626-870, Korea

    Young-Oh Kim, Soo-Byung Park, Woo-Sung Son & Hyung-Il Kim

  3. Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA

    Ching-Chang Ko

  4. College of Dentistry, University of Tennessee, Memphis, TN, USA

    Franklin García-Godoy

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  1. Young-Oh Kim
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  2. Soo-Byung Park
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  3. Woo-Sung Son
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  4. Ching-Chang Ko
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  5. Franklin García-Godoy
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  6. Hyung-Il Kim
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Correspondence to Yong Hoon Kwon.

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Kim, YO., Park, SB., Son, WS. et al. Diode-pumped solid-state laser for bonding orthodontic brackets: effect of light intensity and light-curing time. Lasers Med Sci 26, 585–589 (2011). https://doi.org/10.1007/s10103-010-0802-0

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  • DOI: https://doi.org/10.1007/s10103-010-0802-0

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