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Calcium phosphate orthodontic adhesives: an in vitro investigation of bond strength and calcium ion release

Patel, Jigar Vipinchandra (2012)
M.Phil. thesis, University of Birmingham.

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The aim of this study was to compare the orthodontic bond strength of an experimental tri-calcium phosphate (TCP) composite manufactured in house with commercially available bonding agents. Orthodontic brackets were bonded to 420 previously extracted premolar teeth using Transbond XT (a conventional composite), Fuji Ortho (a resin-modified glass ionomer), Aegis Ortho (an amorphous calcium phosphate (ACP) composite) and experimental composites containing 0%, 1%, 5% and 10% TCP. Bond strength and the mechanism of bond failure was recorded following wet and dry storage of the specimens. The calcium ion release of the 10% TCP composite was measured compared to Aegis Ortho using an ion-selective electrode. All adhesives showed reduction in bond strength following wet storage. Transbond XT was found to produce the greatest bond strength (P<0.05). The experimental TCP composites produced statistically lower (P< 0.05) but clinically acceptable bond strengths following dry storage which significantly reduced following aqueous storage (P<0.05) and showed an increase in cohesive bond failures (P<0.05). The 10% TCP composite was found to release a significantly greater concentration of calcium ions compared to Aegis Ortho (P<0.05) after a 6 week period.

Type of Work:M.Phil. thesis.
Supervisor(s):Palin, William
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:School of Dentistry
Subjects:RK Dentistry
TP Chemical technology
Institution:University of Birmingham
ID Code:3499
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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