Effect of ionizing radiation on the properties of restorative materials

Lima, Renally Bezerra Wanderley e; Vasconcelos, Laís César de; Pontual, Maria Luíza dos Anjos; Meireles, Sônia Saeger; Andrade, Ana Karina Maciel de; Duarte, Rosângela Marques

doi:10.4103/ijdr.ijdr_72_17

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…The results of this study are consistent with Viero et al, 11 who reported a decrease in microhardness after irradiation despite using different materials. As opposed to that, these results came in contrast with Lima et al, 25 who reported no alteration in the microhardness values before and after application of ionizing radiation. This may be explained by a different radiation source (Co source and linear accelerator) and the dose used.…”

Section: Discussioncontrasting

confidence: 89%

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Effect of Ionizing Radiation on the Mechanical Properties of Two Dental Materials Commonly Used in Primary Teeth

El-Korashy,

Elghazawy,

Abdelaziz

et al. 2023

International Journal of Clinical Pediatric Dentistry

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A bstract Aim The purpose of this in vitro study was to evaluate the effect of radiotherapy on flexural strength, microhardness, and surface roughness of bulk fill composite (X-tra fil) and glass ionomer (EQUIA Forte HT). Materials and methods A total of 40 specimens were prepared for each test and were divided into two groups according to the material used (composite or glass ionomer cement), and each group was divided into two subgroups ( n = 10) according to radiation condition, irradiated subgroup, subjected to 50 Gy by multienergy linear accelerator delivered in one shot and control subgroup. Results Control samples of flexural strength and microhardness had a significantly higher value than irradiated samples in both materials. Regarding the surface roughness, irradiated samples had a significantly higher value than the control samples in both materials. Conclusion Irradiation with a linear accelerator had a negative impact on the flexural strength and microhardness of both materials. Moreover, it increased the surface roughness for both materials. Bulk fill composite is the dental restorative material of choice in head and neck cancer patients undergoing radiotherapy due to its high mechanical properties before and after radiation. How to cite this article Nagi BM, El-Korashy DI, Amin A El-S, et al. Effect of Ionizing Radiation on the Mechanical Properties of Two Dental Materials Commonly Used in Primary Teeth. Int J Clin Pediatr Dent 2023;16(5):758–762.

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Section: Discussioncontrasting

confidence: 89%

“…Regarding EQUIA Forte HT, this could be attributed to how ionizing radiation interacts with the structure of water-based cement, forming oxygen-reactive materials. 25 …”

Section: Discussionmentioning

confidence: 99%

Effect of Ionizing Radiation on the Mechanical Properties of Two Dental Materials Commonly Used in Primary Teeth

El-Korashy,

Elghazawy,

Abdelaziz

et al. 2023

International Journal of Clinical Pediatric Dentistry

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“…The stability of the surface roughness of resin composites exposed to radiotherapy is supported by another study that reported an unchanged Ra of a micro-filled and packable composite [ 19 ]. Conflicting results were reported by Lima et al, who found a significant increase in surface roughness due to radiotherapy in composites, glass ionomers, and resin-modified glass ionomers [ 37 ]. In a study by Ugurlu et al, Ra was investigated by atomic force microscopy, and radiation had no effect on a conventional glass ionomer and a giomer; however, a significant increase in Ra was observed for ceramic- and zirconia-reinforced glass ionomers, which was explained by increased absorption of radiation by the reinforcing fillers [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Ionizing Radiation on Fluoride-Releasing Dental Restorative Materials

et al. 2023

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This study aimed to investigate the effects of radiotherapy on the mechanical, chemical, and surface properties of two recently introduced restorative dental materials (a glass hybrid and an alkasite), while two conventional restorative materials served as references. Material specimens of the experimental groups (irradiated) were compared to the specimens of the control groups that underwent the same preparation procedure but without irradiation. The experimental groups of restorative material specimens were irradiated with a total of 70 Gy over 35 days (2 Gy/day × 35 days), while the control groups received no treatment. The following properties were evaluated: surface microhardness (Vickers), surface roughness, color change, flexural strength, flexural modulus, material reliability, and infrared spectra. For the experimental groups, measurements were performed 24 h after specimen preparation, i.e., before radiotherapy and after the completion of the irradiation protocol. For the control groups, measurements were performed after the corresponding periods of no treatment. A statistically significant increase in microhardness (p = 0.001–0.004) and surface roughness (p = 0.013) was observed as a result of material aging/maturation in both the control and experimental groups. However, the only statistically significant difference between the control and experimental groups was observed in the discoloration of the conventional reference material (p < 0.001). In conclusion, no statistically significant negative effects of a therapeutic dose of radiotherapy on any of the tested properties of the alkasite and glass hybrid materials were observed, whereas only a minor negative effect of radiotherapy in terms of discoloration was found for a conventional resin composite that was used as a reference material.

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“…In clinical conditions, dental materials and tooth restorations are exposed to radiotherapy in the presence of saliva. However, the specimens were stored in distilled water in this study following previous investigations [24,29,47,48]. Clinical variables associated with individual biology or oral hygiene such as hyposalivation, caries appearance, and longevity of restorative materials were not evaluated and, therefore, need to be evaluated in further clinical trials.…”

Section: Discussionmentioning

confidence: 99%

“…Cobalt-60 or linear accelerator units can be used as a source of radiation [28]. To simulate the clinical parameters and radiation doses used during radiotherapy, this in vitro study used a linear accelerator to apply the radiation dose of 60 Gy on forty discshaped specimens in a single session [29], with a gamma beam of cobalt-60 teletherapy unit (Theratron 760) simulating a radiotherapy procedure applied to patients with head and neck cancer. Radiation was performed in a hospital environment.…”

Section: Irradiationmentioning

confidence: 99%

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

Amorim

Veríssimo

Ribeiro

et al. 2021

J Mater Sci: Mater Med

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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.

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Effect of ionizing radiation on the properties of restorative materials

Cited by 11 publications

References 14 publications

Effect of Ionizing Radiation on the Mechanical Properties of Two Dental Materials Commonly Used in Primary Teeth

Effect of Ionizing Radiation on the Mechanical Properties of Two Dental Materials Commonly Used in Primary Teeth

Influence of Ionizing Radiation on Fluoride-Releasing Dental Restorative Materials

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

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