Comparative Evaluation of Dimensional Changes for Four Different Types of Heat Activated Denture Base Resins Before and After Exposure to Electron Beam Irradiation: An Invitro Study
European Journal of Molecular & Clinical Medicine,
2020, Volume 7, Issue 10, Pages 3128-3135
AbstractBackground-Removable dentures have been used extensively for the rehabilitation of completely and partially edentulous patients. The success of these prostheses greatly depends on the retention, support and stability. The major objective in the fabrication of complete denture and distal extension partial denture is to attain a denture base that conforms to the supporting tissues with a high degree of accuracy. The PMMA is commonly used as a removable prosthesis material and success of this prosthesis depends on retention, support and stability. The objective in fabrication of complete denture is to obtain denture bases with least dimensional changes which is common reason for relining of them. Electron beam radiation had been used recently but at higher dosage it shows reduction in properties. The aim of this study is to comparative evaluate the Linear dimensional changes of four different types of denture base resins before and after irradiation with electron beam with a low energy dose of maximum up to 50 KGy.
Methods- Linear dimensional changes of denture base resins before and after exposure to electron beam irradiation post-curing were studied. Four different denture base resins were used with commercial names as, DPI, Trevalon, Trevalon HI, and Meliodent heat activated acrylic resins and they were compared with each other. The irradiated denture base resins are compared with non-radiated standard groups.
Results-Our study presented that PMMA-based denture showed better dimensions up to 20kGy after irradiation with electron beam. As crosslinking occurs at low dosage during irradiation and further C–C bonds are split off and the polymeric structure starts to break down at High dosage of radiation.
Conclusions-Linear dimensional properties DPI heat cure acrylic resin, Trevalon, Trevalon HI, and Meliodent heat cure acrylic resins can be altered by the lower dosage of electron beam irradiation. By comparing the Linear dimensional change of all heat activated denture base resins, with linear dimensional change of all heat cure denture base resins before irradiation, it was observed that – irradiated heat cure denture base resins show change in results. But Linear Dimensional changes can be reduced only up to lower dosage up to 20kGy further it start getting reduced.
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