Effects of ionizing radiation on surface properties of current restorative dental materials

Débora Michelle Gonçalves De Amorim,Marilia Regalado Galvão Rabelo Caldas,Isauremi Vieira De Assunção,Aretha Heitor Veríssimo,Anne Kaline Claudino Ribeiro,Boniek Castillo Dutra Borges,Rodrigo Othávio De Assunção E Souza

doi:10.1007/s10856-021-06543-5

Débora Michelle Gonçalves De Amorim, Marilia Regalado Galvão Rabelo Caldas + Show 5 more

Open Access

https://doi.org/10.1007/s10856-021-06543-5

Copy DOI

Abstract

To investigate the impact of radiotherapy on surface properties of restorative dental materials. A conventional resin composite—CRC (Aura Enamel), a bulk-fill resin composite—BFRC (Aura Bulk-fill), a conventional glass ionomer cement—CGIC (Riva self cure), and a resin-modified glass ionomer cement—RMGIC (Riva light cure) were tested. Forty disc-shaped samples from each material (8 mm diameter × 2 mm thickness) (n = 10) were produced according to manufacturer directions and then stored in water distilled for 24 h. Surface wettability (water contact angle), Vickers microhardness, and micromorphology through scanning electron microscopy (SEM) before and after exposition to ionizing radiation (60 Gy) were obtained. The data were statistically evaluated using the two-way ANOVA and Tukey posthoc test (p < 0.05). Baseline and post-radiation values of contact angles were statistically similar for CRC, BFRC, and RMGIC, whilst post-radiation values of contact angles were statistically lower than baseline ones for CGIC. Exposition to ionizing radiation statistically increased the microhardness of CRC, and statistically decreased the microhardness of CGIC. The surface micromorphology of all materials was changed post-radiation. Exposure to ionizing radiation negatively affected the conventional glass ionomer tested, while did not alter or improved surface properties testing of the resin composites and the resin-modified glass ionomer cement tested.

Highlights

The head and neck region is a prevalent site for the occurrence of malignant neoplasms which mainly affect several oral tissues [1, 2]
The restorative treatment of caries lesions before radiation therapy is necessary to prevent disease progression and reduce the burden of microorganisms [9]. This approach is important because adhesion between restorative materials and dental tissues is compromised by ionizing radiation so that a post-radiotherapy tooth restoration might provide an unsuccessful treatment [10]
This study aimed to evaluate the influence of ionizing radiation on surface wettability, microhardness, and micromorphology of conventional and bulk-fill resin composites, and conventional and resin-modified glass ionomer cement

Summary

Introduction

The head and neck region is a prevalent site for the occurrence of malignant neoplasms which mainly affect several oral tissues [1, 2]. The treatment of cancer in the head and neck region is generally based on clinical staging, tumor location, histological differentiation, and the patient’s clinical conditions [3, 4]. The management of patients submitted to cervicofacial radiotherapy requires a multidisciplinary approach, making the restoration of caries lesions highly challenging for dentists [7, 8]. The restorative treatment of caries lesions before radiation therapy is necessary to prevent disease progression and reduce the burden of microorganisms [9]. This approach is important because adhesion between restorative materials and dental tissues is compromised by ionizing radiation so that a post-radiotherapy tooth restoration might provide an unsuccessful treatment [10]

Objectives

Methods

Results

Discussion

Conclusion