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KMID : 0362419960340010201
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Journal of Korean Academy of Prosthodontics
1996 Volume.34 No. 1 p.201 ~ p.232
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A clinical study on the prosthodontic treatment of maxillary defect
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Heo Seong-Joo
Chang Ik-Tae
Kim Kwang-Nam
Yang Jae-Ho
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Abstract
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The Purpose of this was to evaluate the effect of thermocycling on bond strength between metal and resin cement according to thermocycling, and to observe the bond failure modes with optical microscope(×30). For this purpose, Super-Bond C & B and Panavia 21 resin cement were used. Metal specimen were made of Vera-Bond and the surface of specimens were sandblasted with 50㎛ aluminum oxide. All experimental groups were stored in 37℃ distilled water for 72 hours, followed by thermocycling between 5℃ and 55℃ with 15 second dwell time. 500, 1000, 2000 cycles of thermocycling were executed and the tensile bond strength was measured by Instron Universal Testing Machine(Model 4201). @ES The obtained results were as follows : @EN 1. Super-Bond C & B and Panavia 21 did not show statistically significant difference according to thermocycling test(P>0.05). 2. Super-Bond C & B specimens exhibited statistically significant higher tensile bond strength than Panavia 21 for all experimental groups(P<0.05). 3. Super-Bond C & B exhibited mixed mode failure with partial adhesive and partial cohesive failure, and most of Panavia 21 exhibited cohesive failure and some mixed mode failure
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