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Diode-pumped solid-state laser for bonding orthodontic brackets: effect of light intensity and light-curing time
Young-Oh Kim1, Soo-Byung Park, Woo-Sung Son
1Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan, 626-870, Korea.
Lasers in Medical Science
|June 10, 2010
Summary
This study found that diode-pumped solid-state (DPSS) lasers can effectively bond orthodontic brackets, showing slightly higher shear bond strength (SBS) than traditional lights. Increasing laser energy density linearly improved SBS, indicating a promising alternative curing method.
Area of Science:
- Dental Materials Science
- Biomedical Engineering
- Orthodontics
Background:
- Orthodontic bracket bonding relies on effective light-curing of adhesives.
- Traditional quartz-tungsten-halogen (QTH) lights are commonly used for curing.
- Exploring alternative light sources like lasers may offer improved bonding efficiency.
Purpose of the Study:
- To evaluate the shear bond strength (SBS) of orthodontic brackets cured with a 473 nm diode-pumped solid-state (DPSS) laser.
- To compare the efficacy of DPSS laser curing with conventional QTH light curing.
- To investigate the influence of DPSS laser intensity and curing time on bracket bond strength.
Main Methods:
- 150 extracted human teeth were divided into ten groups for bracket bonding.
- Control group used QTH light (900 mW/cm²).
- Experimental groups used a DPSS laser (473 nm) with varying intensities and curing times.
- Shear bond strength (SBS) and adhesive remnant index (ARI) were statistically analyzed.
Main Results:
- DPSS laser at 700 mW/cm² for 40s showed slightly higher SBS (12.2 ± 1.8 MPa) than QTH light (11.6 ± 1.6 MPa).
- SBS increased linearly with DPSS laser energy density (light intensity × time) (R = 0.95, p < 0.001).
- ARI scores indicated similar bracket failure modes across groups.
Conclusions:
- DPSS laser curing is a viable alternative for orthodontic bracket bonding, potentially offering superior SBS.
- Higher energy density from DPSS lasers correlates with increased shear bond strength.
- Further research into optimal DPSS laser parameters for orthodontics is warranted.
