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KMID : 0358920090360030427
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Journal of the Korean Academy of Pedodontics
2009 Volume.36 No. 3 p.427 ~ p.432
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COMPARATIVE STUDY OF PHYSICAL PROPERTIES FOR VARIOUS BAND CEMENTS
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Yang Kyu-Ho
Kim Ki-Beak
Kim Seon-Mi
Choi Nam-Ki
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Abstract
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The aim of this study was to compare the shear-peel strength and the fracture site of 5 commercially available orthodontic band cements. One hundred molar bands were cemented to extracted human 3rd molars. The specimens were prepared in accordance with the manufacturer’s instructions for each cement. After storage in a humidor at 37℃ for 24 hours, the shear debonding force was assessed for each specimen using an universal testing machine with crosshead speed of 2 mm/minute. Maximal failure stress was converted to mean shearpeel strength, MPa. The predominant site of band failure was recorded visually for all specimens as either at the band/cement or cement/enamel interface. Mean shear-peel strength of Ormco was the highest(2.44±0.57), followed by Fuji OrthoTM(2.24±0.50), Ketac-CemTM(2.10±0.57), 3M UnitekTM(1.82±0.43), Band-LokTM(1.73±0.28). There were statistically significant differences between Ormco and Band-LokTM, Ormco and 3M UnitekTM, and Fuji OrthoTM and Band- LokTM(p<0.05). The predominant site of bonding failure for bands cemented with the Ormco was at the band/cement interface, whereas bands cemented with Ultra Band-LokTM failed predominantly at the enamel/cement interface. There was no significant difference among the other cements(Fuji OrthoTM, 3M UnitekTM, Ketac-CemTM).
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KEYWORD
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Orthodontic band, Cement, Shear-peel bond strength, Failure site
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