Curing efficiency of three light emitting diode units at different curing profiles.
1Department of Orthodontics, Himachal Dental College, Sundernagar, Mandi, Himachal Pradesh, India.
Summary
High-intensity light emitting diode (LED) curing lights can reduce orthodontic bracket bonding time. Shorter exposure times with high-intensity LED lights are clinically acceptable, but single buccal-side exposures yield lower bond strength.
Area of Science:
- Dental Materials Science
- Orthodontic Technology
- Biomaterials Engineering
Background:
- High-intensity light emitting diode (LED) lamps offer reduced exposure times for bonding orthodontic attachments, aiming to save clinical time.
- The efficiency and effectiveness of these newer technologies require thorough evaluation.
Purpose of the Study:
- To evaluate the shear bond strength of orthodontic brackets cured with three different LED curing units.
- To compare the impact of varying intensities and curing times on bond strength.
- To assess the effect of different exposure methods and compare residual adhesive amounts after debonding.
Main Methods:
- 120 metal brackets were bonded to extracted premolar teeth using three distinct LED curing units.
- Shear bond strength was measured using a universal testing machine.
- Residual adhesive was quantified using the modified adhesive remnant index.
Main Results:
- The highest shear bond strength was observed in Group 1A, followed by Group 3A, with Group 3B showing the lowest.
- Significant differences in shear bond strength were found when comparing groups with different curing protocols (e.g., 1A, 2A, 3A vs. 1B, 2B, 3B).
Conclusions:
- Reducing exposure time to 6 seconds with high-intensity curing light is clinically acceptable and recommended.
- Single-exposure curing of metal brackets from the buccal side resulted in lower shear bond strength values.
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