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Am J Orthod Dentofacial Orthop. 2010 Aug;138(2):195-200. doi: 10.1016/j.ajodo.2009.06.024.

Debonding of ceramic brackets by a new scanning laser method.

Author information

1
Department of Orthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.

Abstract

INTRODUCTION:

The purpose of this in-vitro study was to develop a new method to debond ceramic brackets by scanning with an Er:YAG laser.

METHODS:

Sixty bovine mandibular incisors were randomly divided into 2 groups of 30. Polycrystalline ceramic brackets were placed on their labial surfaces by using the orthodontic composite adhesive Transbond XT (3M Unitek, Monrovia, Calif) and light cured for a total of 40 seconds. The first group was the control group, with no laser application performed. The Er:YAG laser was used on each bracket in the study group at 4.2 W for 9 seconds with the scanning method. The force required for debonding the brackets was applied 45 seconds after laser exposure. Shear bond strengths were measured in megapascals with a universal testing machine, and adhesive remnant index scores were assigned to each specimen.

RESULTS:

Statistically significant (P <0.001) lower shear bond strengths were found in the laser group (9.52 MPa) compared with the control group (20.75 MPa). Likewise, the adhesive remnant index scores were statistically different (P <0.001); the laser group had twice as many samples with adhesive, with the adhesive remnant index scores of 2 or 3.

CONCLUSIONS:

The application of the Er:YAG laser with the scanning method is effective for debonding ceramic brackets by degrading the adhesive through thermal softening.

PMID:
20691361
DOI:
10.1016/j.ajodo.2009.06.024
[Indexed for MEDLINE]

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