Comparative Evaluation of the Effect of Radiation Therapy on Surface Micro Hardness of Three Restorative Materials— An in Vitro Study Shetty Karthik1,*, Byju Mary1, Phin Chong Hao1, Saxena P U2, Srinivas Challapalli2 1Department of Conservative dentistry and Endodontics, Manipal College of Dental Sciences, Mangalore 2Department of Radiotherapy, Kasturba Medical College, Mangalore, (Affiliated to Manipal Academy of Higher Education, Manipal), Light House Hill Road, Mangalore, Karnataka, India *Corresponding Author: Dr Karthik Shetty, Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India, Phone: +91-824-2423452/2428716(Ext: 5665) Email: karthik.shetty@manipal.edu
Online published on 19 August, 2019. Abstract Context Dental restorations in Patients undergoing radiotherapy for the treatment of Malignancies may undergo changes in their physical properties due to the irradiation. Aims To investigate the effect of Gamma irradiation applied during cancer radiation therapy on the surface microhardness of Cention N, Zirconomer and 3M Filtek Bulkfil Posterior Packable Composite. Settings and Design In-vitro study conducted in a Dental school. Method and Material Twenty specimens of each material were prepared within acrylic moulds and these were divided into six groups with 10 of each restorative material per group. Groups 1, 2, and 3 were not subjected to any intervention whereas Groups 4, 5 and 6 were subjected to the radiotherapy protocol which is used on patients with malignancies. Statistical Analysis Used Two-way repeated ANOVA and Tukey's test. Results After irradiation the comparative changes in the surface microhardness in all the groups were statistically significant. The values of surface hardness of the Filtek group remained the highest followed by the Cention and Zirconomer groups. Conclusions The conclusion than can be drawn from this study are that the exposure to Gamma radiation does affect the surface hardness of the materials tested. Top Keywords Surface micro hardness, Therapeutic ionising radiation, Vickers hardness test. Top |