Abstract
Objective: This study was performed to reveal the physical changes of polymers used after gamma irradiation of a modified twin block appliance versus conventional twin block appliance in the treatment of growing females with skeletal Class II malocclusion having mandibular deficiency. Materials and methods: The total sample consisted of 12 specimens 6 from every polymer, modified twin block group which was composed of polyethylene polymer and conventional twin block group which was formed of poly methyl-methacrylate polymer used in this study, exposed to different gamma irradiation doses (25 KGray and 30 KGray) in order to test their physical properties. Assessment was done using UV-visible spectroscopy and scanning electron microscope. Results: This study revealed that concerning the gamma radiation effect on the polymers used, Poly methyl methacrylate showed yellowish color change and increased number of pores on its surface after irradiation while polyethylene vacuum sheets didn’t show any color change but the scratches and pores appeared on its surface using scanning electron microscope. Conclusion: From the previous results it can be concluded that the modified twin block appliance can be used as an alternative orthopedic appliance in treatment of skeletal class II malocclusion growing subjects with mandibular retrusion.
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