British Journal of Orthodontics, Vol 25, 289-291, Copyright © 1998 by British Orthodontic Society

ARTICLES

Notching of orthodontic bonding resin to facilitate ceramic bracket debond--an ex vivo investigation

CJ Larmour, JF McCabe and PH Gordon
Department of Child Dental Health, Newcastle Dental School, Newcastle upon Tyne, UK.

This ex vivo study assessed the potential of introducing a notch in the bond layer, as a means of facilitating the removal of ceramic brackets. Sixty extracted premolar teeth were divided into three groups of 20 teeth and bonded with Intrigue brackets using Concise chemically-cured adhesive. The bonding technique was modified with groups 1 and 2 by introducing a notch in the bond layer. Group 1 was notched from the gingival aspect, group 2 from the occlusal, and group 3 served as a control. The brackets were removed by applying a shear load from the gingival aspect using an Instron universal testing machine. The mean force to debond was calculated for each group. The results showed that introducing a notch significantly reduced the mean and maximal debond forces. This was confirmed with Weibull analysis with the notched specimens having a higher probability of failure at any force. In addition, ceramic bracket fracture was eliminated. Notching the bonding resin may be helpful in facilitating the removal of ceramic brackets.

This article has been cited by other articles:

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