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KMID : 1004520110270020197
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Journal of Dental Rehabilitation and Applied Science
2011 Volume.27 No. 2 p.197 ~ p.207
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The Effect of Packing Method of Relining Material on the Flexural Strength of Denture Base Resin
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Kim Min-Chul
Kim Yu-Lee
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Abstract
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The study aimed at examining how different reline resins affect flexural strength and flexural modulus of denture base.
A total of 80 specimens (64 x 10 x 3.3 mm, according to ISO 1567:1999) of heat-polymerized resin, 40 specimens for
(Lucitone199(Dentsply Int., NewYork, USA), SR Ivocap(Ivoclar AG, Schaan, Liechtenstein)) respectively, were polymerized
according to the manufacturer’s instructions and divided into eight groups(n = 10). Control group specimens remained intact. Specimens in the other groups were abraded on both sides to 2 mm thickness, and were relined in 1.3 mm thickness with 3 types of resins (Lucitone199(Dentsply), SR Ivocap(Ivoclar), and Rebase II(Tokuyama Co., Ltd, Tokyo, Japan)). All specimens were preserved in distilled water at 37℃ for 50 hours, and then were subjected to flexural strength testing in a universal testing machine using 3-point loading. A crosshead speed of 5 mm/min was used, and the distance between the supports was 50 mm. Data analyses included one-way analysis of variance(ANOVA) and the Tukey Honestly Significant Difference test (p=.05). Both heat-polymerized resin groups and auto-polymerized resin groups showed statistically low flexural strength and flexural modulus than control groups. Specimens relined with Lucitone 199 showed significantly higher flexural strength and flexural modulus than those relined with SR-Ivocap. Specimens relined with auto-polymerized resin showed significantly lower flexural strength and flexural modulus than those relined with heat-polymerized resin. Relining with heat-polymerized resins showed superior mechanical properties to relining with an auto-polymerized resin. Relining with the same heat-polymerized resin as the denture base does not affect mechanical properties of a denture. Lucitone199 using a compression-mould technique resulted in the highest flexural strength.
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KEYWORD
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denture base resin, flexural strength, flexural modulus, heat-polymerization, relining, three-point bending test
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