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In Vitro Evaluation of The Effects Of Er,Cr:YSGG and Diode Lasers Used on Titanium Cylinder

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Diode laser debonding of ceramic brackets.

Paul J Feldon¹, Peter E Murray², James G Burch³

¹Private practice, Boca Raton, Fla.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|October 5, 2010

Summary

Diode lasers effectively debond monocrystalline ceramic brackets by reducing shear bond strength without harming pulp chamber temperature. However, they were ineffective for polycrystalline brackets.

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Area of Science:

Materials Science
Biomaterials Engineering
Dental Materials

Background:

Ceramic brackets are widely used in orthodontics.
Debonding ceramic brackets can be challenging.
Diode lasers offer a potential minimally invasive debonding method.

Purpose of the Study:

To evaluate the efficacy of diode laser debonding for ceramic orthodontic brackets.
To assess the impact of diode laser application on bracket shear bond strength.
To investigate the thermal effects on the pulp chamber during laser debonding.

Main Methods:

Two types of ceramic brackets (monocrystalline and polycrystalline) were bonded to bovine teeth.
A diode laser was applied for 3 seconds at 2 W/cm² and 5 W/cm² energy levels.
Shear bond strength and pulp chamber temperature were measured; ANOVA was used for analysis.

Main Results:

Diode laser significantly reduced shear bond strength for monocrystalline brackets (P <0.05).
Diode laser was ineffective in reducing shear bond strength for polycrystalline brackets.
No significant differences in adhesive remnant index scores were observed between groups.

Conclusions:

Diode laser debonding is effective for monocrystalline ceramic brackets, lowering required force without significant pulp temperature increase.
Diode laser application did not significantly decrease debonding force for polycrystalline ceramic brackets.
Laser debonding shows promise for specific ceramic bracket types in orthodontic treatment.