Effect of Photon Radiotherapy on Degree of Conversion and ‎Compressive Strength of Nanohybrid Resin Composite ‎Restoration: An in Vitro Study

Document Type : Original articles

Authors

1 Biomaterials department, Faculty of Dentistry, Assiut university, Assiut, Egypt.

2 dental material department,faculty of dentistry, Minia university

3 Department of Radiation Oncology and Nuclear Medicine, South Egypt Cancer Institute, Assiut University, Assiut, Egypt

4 Biomaterials Department, Faculty of Dentistry, Minia University, 61511 Minia, Egypt

Abstract

Aim: This study aimed to assess how different photon radiation dosages affected the nanohybrid resin composite's degree of conversion and compressive strength.
Materials and Methods: A total of 30 samples of nanohybrid resin composite (Grandio, VOCO GmbH, Germany), 15 disc shaped and 15 cylindrical shaped, were prepared for testing degree of conversion and compressive strength. The samples were divided into three main groups Ⅰ-Ⅲ: control (nonirradiated), 50 Gy, and 70 Gy respectively. The samples were subjected to photon radiotherapy regarding their groups then tested for degree of conversion by FTIR and compressive strength by universal testing machine. After that, a statistical analysis was performed on the data.
Results: The findings indicated that there was no statistically significant variation in the degree of conversion among the groups. However, Group III exhibited the highest statistically significant compressive strength value, while Group I had the lowest.
Conclusion: Within the therapeutic doses, photon radiotherapy did not affect the polymerization of nanohybrid resin composite. It might also improve the resin composite's mechanical properties.

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