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

Amorim, Débora Michelle Gonçalves de; Veríssimo, Aretha Heitor; Ribeiro, Anne Kaline Claudino; Souza, Rodrigo Othávio de Assunção e; Assunção, Isauremi Vieira de; Caldas, Marília Regalado Galvão Rabelo; Borges, Boniek Castillo Dutra

doi:10.1007/s10856-021-06543-5

Cited by 10 publications

(11 citation statements)

References 43 publications

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“…Therefore, they questioned the notion that the increase in MH was due to improved polymerization and suggested that some other, unidentified structural change may be responsible for this effect [ 33 ]. Another explanation for the increase in MH due to radiotherapy was provided by de Amorim et al, who demonstrated, in a scanning electron microscopy study, that radiation can damage the resin-rich layer on the material surface, thereby exposing more inorganic filler particles and, in turn, improving MH [ 34 ]. Their study showed that the same effect can work in the opposite direction to reduce the MH of conventional glass ionomers covered with a coating resin, since in this case, the exposed underlying material is softer than the coating resin damaged by radiation.…”

Section: Resultsmentioning

confidence: 99%

“…The potential of radiotherapy to affect the surface roughness of restorative materials is unclear, as the available literature provides mixed results. A scanning electron microscopy study by de Amorim et al, demonstrated that radiation can expose filler particles in subsurface layers of resin composites and even remove the coating resin layer of glass ionomers, resulting in surface roughening which depends on the size of the exposed particles [ 34 ]. The effect of radiation on surface roughness appears to be material-dependent, as in one study, an increase in Ra was observed only for a resin-modified glass ionomer, while no significant Ra change was observed for conventional glass ionomers and resin composites [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Influence of Ionizing Radiation on Fluoride-Releasing Dental Restorative Materials

et al. 2023

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“…Thus, the results suggest that in cases of the need to apply pit and ssure sealants in patients who are going to undergo or have undergone radiotherapy, resin sealants would be the materials of choice because they are not altered by radiotherapy and present a better performance in terms of adherence [29,35,36,38] . However, both classes of materials, resinous and ionomeric, are effective in preventing or paralyzing a carious lesion process, so the material that best ts the speci cations of each patient and the conditions of the operative eld should be chosen, considering the indications and contraindications of the materials [17,35,36,38,46,47,59] .…”

Section: Discussionmentioning

confidence: 99%

Influence of radiotherapy on the physical-mechanical properties of different pit and fissure sealants

Marubayashi

Galo

Barbosa

et al. 2023

Preprint

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Objectives: This study was to evaluate whether ionizing radiation used in the treatment of Head and Neck Cancer interferes with the adhesion of pit and fissure sealants applied to tooth enamel. Materials and Methods: A total of 105 healthy human teeth were randomly allocated between the control group (non-irradiated teeth) and irradiated groups subdivided into pre-radiotherapy and post-radiotherapy. The teeth were treated using a resin sealant (Fluoroshield®) or a cement of conventional glass ionomer (Ketac Molar Easymix®). The conventional radiotherapy protocol consisted of applying an irradiation dose of 2Gy per day, over a period of 35 days, totaling a cumulative dose of 70Gy. Marginal microleakage test (n=60 teeth) and shear test (n=45 teeth) were performed. Data statistical analysis considered a significance value of 5%. Results: Both in the shear test and the microleakage test, the resin sealant presented the best results. Also, there was no statistically significant difference in any of the tests between the non-irradiated groups and groups that received radiotherapy. Conclusions: Thus, radiotherapy does not influence the adhesion of pit and fissure sealants of the different materials used, and the resin sealant presented better performance when compared to the conventional glass ionomer. Clinical relevance: of this study lies in the fact that patients undergoing radiotherapy treatment can undergo preventive treatment with sealants before or after radiotherapy, with resinous materials being the most suitable for this condition.

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“…Through hydrolysis, X groups transform to the alkoxy group and create covalent or hydrogen bonding together with the alkoxy group exist on the inorganic ller particles' surface while Y is reactive groups that attach with organic monomers and therefore enhance adhesion of ller-matrix interface [18] . According to De Amorim et al [19] silanized ouroaluminosilicate llers and methacrylate monomers produced a more stable bond between llers and monomers in resin modi ed glass ionomer, thus post radiation morphology was conserved.…”

Section: Discussionmentioning

confidence: 99%

Surface Roughness and Color Change of Gamma Irradiated Nanohybrid Resin Composite and Giomer Restorative Materials

Abaza,

Yassen

2023

Preprint

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Background This study evaluated the effect of gamma radiation on surface roughness and color change of nanohybrid composite and giomer restorative materials. Methods Twenty-four-disc shaped specimens (2×2mm) were fabricated; half of them were prepared from Filtek Z-350 nanocomposite while the other half were prepared from Beautiful II giomer restorative material. Each material was divided into two subgroups, control and gamma irradiated. Surface roughness was assessed for each group after 24 hrs. then after 6 months storage in artificial saliva using USB Digital microscope while color change was evaluated using a Reflective spectrophotometer at the same time intervals. Data showed parametric distribution and were analyzed using independent and paired t-test for analyzing independent and dependent variables respectively. Intergroup comparisons were analyzed using one-way ANOVA followed by Tukey’s post hoc test. Results For surface roughness, there was significant increase for both nanocomposite and giomer after 6 months storage. For color change assessments, at both time intervals, Giomer had significantly higher color change than composite (p < 0.05). For both materials, color change measured after 6 months was significantly higher than 24 hours value (p < 0.05). Exposure to gamma irradiation did not affect surface roughness of both materials while it affected their color change. Conclusions Time has a detrimental effect on surface roughness of resin composite and Giomer, while gamma radiation has the same effect but on the color change.

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

Cited by 10 publications

References 43 publications

Influence of Ionizing Radiation on Fluoride-Releasing Dental Restorative Materials

Influence of Ionizing Radiation on Fluoride-Releasing Dental Restorative Materials

Influence of radiotherapy on the physical-mechanical properties of different pit and fissure sealants

Surface Roughness and Color Change of Gamma Irradiated Nanohybrid Resin Composite and Giomer Restorative Materials

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