To investigate and compare the relaxation force, swelling ratio, cytotoxicity of experimental synthetic elastomers, this study was done on 5 kinds of experimental synthetic elastomers(X590A-1, Sl55D-2, S195A-10, R185-19, S185A-44). We took
Ormco's
power
chain as control group, contrast to the 5 kinds of experimental properties of the 5 kinds of experimental synthetic elasttomers were investigated.
Results were as follows :
1. Control group showed thermoplastic nature and esteric structure of polyurethane.
2. Melting points of S155D-2 and S195A-10 in experimental group were similar to control group.
3. In relaxation force test, remaining forces were the least decrease in control group among all the tested materials, but S155D-2 was the least decrease in experimental group. Significant difference was found in relaxation test between control
group
and exdperimental group. Relaxation forces of control group was significantly higher than experimental group.
4. Significant difference was found in swelling ratio test between control group and experimental goup. Control group was superior to experimental group.
5. In cytotoxic test, all experimental materials showed mild toxicity.
As a result of this study initial retraction force of S155D-2 was higher than control group. If the decreasing method of initial retraction force were developed in plastic process, S155D-2 could be applied in orthodontic treatment.
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