Bond Strengths Evaluation of Laser Ceramic Bracket
Debonding¹

T. Dostalová^a, *, H. Jelinková^b, J. Sulc^b, M. Nmec^b, M. Fibrich^b, M. Jelínek^b,
P. Michalík^a, and M. Buková^a

^a Charles University, 2nd Medical Faculty, Department of Paediatric Stomatology,
150 06 Prague 5, Czech Republic

^b Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering,
115 19 Prague, Czech Republic

*e-mail: tatjana.dostalova@fnmotol.cz

Received February 28, 2012; published online August 1, 2012

Abstract—Ceramic brackets often used for an orthodontic treatment can lead to problems such as enamel tear
outs because of their low fracture resistance and high bond strengths. Therefore the aim of our study was to
investigate the positive laser radiation effect on bracket debonding. Moreover, the influence of the enamel shape
surface under the bracket and laser radiation power on the debonding strength was investigated. The source of
the radiation was the longitudinally diode-pumped Tm:YAP laser operating at 1997 nm. To eliminate the tooth
surface roughness the flat enamel surface was prepared artificially and the bracket was bonded on it. The deb-
onding was accomplished by Tm:YAP laser radiation with different the power value while recording the tem-
perature rise in the pulp. To simulate the debonding process in vivo the actual bond strength was measured by
the digital force gauge. The results were analyzed by scanning electron microscope.

DOI: 10.1134/S1054660X12090046

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