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KMID : 0355220100350010075
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Journal of Korean Academy Oral Medicine
2010 Volume.35 No. 1 p.75 ~ p.81
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The Effect of Water Immersion on the Surface Strength and the Flexural Strength of the Acrylic Resin for Occlusal Appliances
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Lee Hoy-Youn
Im Yeong-Gwan
Kim Byung-Gook
Lim Hoi-Soon
Kim Jae-Hyeong
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Abstract
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By repeating nocturnal bruxism occlusal appliance’s wearing condition that is used to cure temporomandibular disorders into the vitro experiment, research aims to find out how moisture infiltrated and drying cycle process affects on the surface microhardness of the resin for occlusal appliance and flexural strength.
By utilizing resin for occlusal appliance which is the main component of poly methyl methacrylate, bar shaped sample was produced. For the resin sample utilized as the controlled group 1, the sample was infiltrated in the moisture for 7 days in the temperature of 37C. Then, the resin sample of the controlled group 2 was maintained in a dry condition for 7 days in the normal temperature. After that, each sample’s surface microhardness and flexural strength were measured.
For the resin sample that is utilized as the experimental sample, the sample was infiltrated in the moisture for 7 days in the temperature of 37C. Then, it was inundated for 8 hours a day and dried in the normal temperature for 16 hours with the continuous process of moisture infiltration and dry cycle process for 30 days. During this cycle process, sample’s surface and flexural strength were measured in the 1st day, 7th day, and 30th day. Then, it was statistically analyzed to find out the difference of controlled and experiment group’s surface microhardness and flexural strength. Results are
1. For the experimental and controlled group’s surface microhardness of the resin for the occlusal appliance, it did not show any significant differences after moisture infiltration and dry cycle process repetition.
2. In case of the flexural strength for resin for the occlusal appliance, experimental group with moisture infiltration and dry cycle for 30 day process had greater effect than the experimental group at the 1st day and controlled group These results can be considered to be utilized from the patients of the temporomandibular disorders towards occlusal appliance used and maintained method.
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KEYWORD
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Acrylic resin, Occlusal appliance, Surface microhardness, Flexural strength, Moisture
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