Debonding of the orthodontic brackets; is diode laser a safer method? Experimental invitro study

Area of Science:

• Dentistry
• Biomaterials
• Laser Technology

Background:

• Bracket debonding in orthodontics poses risks of enamel damage, especially with ceramic brackets.
• Laser-assisted techniques offer potential for safer, less traumatic bracket removal.

Purpose of the Study:

• To evaluate the impact of 940 nm diode laser irradiation on orthodontic bracket debonding.
• To assess effects on shear bond strength (SBS) and enamel surface morphology.

Main Methods:

• Extracted human premolars were divided into four groups: control metallic, control ceramic, laser-treated metallic, and laser-treated ceramic.
• Laser treatment involved 940 nm diode laser at 1 W for 5 seconds.
• Shear bond strength (SBS) was measured, and enamel surfaces were analyzed using scanning electron microscopy (SEM).

Main Results:

• Laser debonding significantly reduced SBS for metallic brackets (2.4 MPa vs. 4.3 MPa).
• No significant difference in SBS was observed for ceramic brackets.
• SEM showed smoother enamel surfaces with fewer cracks in laser-treated groups.

Conclusions:

• 940 nm diode laser-assisted debonding is effective in reducing SBS for metallic brackets and minimizing enamel damage.
• The technique shows promise for safer orthodontic bracket removal.
• Current power settings have limited effect on ceramic bracket debonding.