Bond strengths and debonding characteristics of two types of polycrystalline ceramic brackets
Published Online: Dec 14, 2023
Page range: 134 - 140
Received: Jan 01, 2010
Accepted: May 01, 2010
DOI: https://doi.org/10.2478/aoj-2010-0022
© 2010 Katia Lemke et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Objectives
To compare the shear bond strengths and modes of failure of three orthodontic brackets: a polycrystalline ceramic bracket, a collapsible polycrystalline ceramic bracket and a metal bracket.
Methods
Ninety extracted human premolar teeth were selected and examined at x3 magnification for any enamel defects. Three types of brackets and one orthodontic adhesive were used. One half of the sample was tested in a universal testing machine to determine the shear bond strength. The other half was debonded with the appropriate pliers and the tooth surface examined at x5 magnification. The site of failure was scored with the modified Adhesive Remnant Index (ARI). Teeth with an ARI grade of zero were examined in a SEM to determine any enamel fracture.
Results
No statistically significant differences in bond strength among the samples were found (
Conclusions
All three samples had similar bond strengths. The risk of ceramic fracture on debonding was greatest for the InVu ceramic bracket.