Does the CO2 laser reduce bond strength in different types of ceramic brackets?

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Orthodontic Technology

Background:

• Dental adhesives are crucial for orthodontic bracket fixation.
• Ceramic brackets offer aesthetic advantages but their bond strength requires optimization.
• Laser surface treatment is explored for enhancing dental material adhesion.

Purpose of the Study:

• To evaluate the in vitro effect of CO2 laser irradiation on the shear bond strength (SBS) of ceramic brackets to enamel.
• To compare the SBS of two different ceramic bracket types (Allure and Transcend) with and without laser treatment.

Main Methods:

• Sixty bovine incisor enamel surfaces were bonded with Allure or Transcend ceramic brackets.
• Subgroups were treated with CO2 laser (10W, 3s) or no laser (control).
• Shear bond strength was tested, and Adhesive Remnant Index (ARI) was assessed post-debonding.

Main Results:

• The Transcend (TC) group exhibited significantly higher SBS compared to all other groups.
• Laser-treated specimens (AL and TL) showed significantly lower SBS than their non-lased counterparts (AC and TC).
• The Allure bracket (AL) showed a more pronounced decrease in SBS after laser treatment.

Conclusions:

• CO2 laser irradiation decreases the shear bond strength of polycrystalline ceramic brackets to enamel.
• The type of ceramic bracket influences bond strength, with Transcend demonstrating superior performance.
• Laser treatment may compromise the bond integrity of certain ceramic bracket systems.