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