Volume 41, Issue 1 pp. 162-169
ORIGINAL ARTICLE

Effect of radiotherapy on the chemical composition of root dentin

Lívia Bueno Campi MSc

Lívia Bueno Campi MSc

Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

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Fabiane Carneiro Lopes PhD

Fabiane Carneiro Lopes PhD

Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

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Luís Eduardo Silva Soares PhD

Luís Eduardo Silva Soares PhD

Laboratory of Dentistry and Applied Materials (LDAM), Research and Development Institute (IP&D), Universidade do Vale do Paraíba, Univap, São José dos Campos, São Paulo, Brazil

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Alexandra Mussolino de Queiroz PhD

Alexandra Mussolino de Queiroz PhD

Department Children's Clinic, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

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Harley Francisco de Oliveira PhD

Harley Francisco de Oliveira PhD

Medical Clinic Department, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

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Paulo César Saquy PhD

Paulo César Saquy PhD

Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

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Manoel Damião de Sousa-Neto PhD

Corresponding Author

Manoel Damião de Sousa-Neto PhD

Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

Correspondence

Manoel D. Sousa Neto, Associate Professor, Department of Restorative Dentistry, School of Denistry of Ribeirão Preto, University of São Paulo, Rua Célia de Oliveira Meirelles 350, 14024-070, Ribeirão Preto, São Paulo, Brasil.

Email: [email protected]

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First published: 15 December 2018
Citations: 22

Abstract

Background

The radiotherapy can directly affect the bond strength of the adhesive materials, interfering in the prognosis of restorative treatments, which may be caused by chemical changes in dentin structure.

Methods

Twenty inferior homologues premolars were distributed in 2 groups (in vitro study) (n = 10): nonirradiated and irradiated. The specimens were submitted to the analysis of phosphate (ν1PO43−2PO43−4PO43−), carbonate (ν3CO32−), amide I, CH2, amide III, and amide I/III ratio by confocal Raman spectroscopy. Data were submitted to statistical analysis (T test, P < .05).

Results

In intracanal dentin, the irradiated group had lower ν4PO43− values (1.23 ± 0.06) compared to nonirradiated group (1.40 ± 0.18) (P < .05), with no difference for ν1PO43− and ν2PO43 peaks (P > .05). The irradiated (1.56 ± 0.06) had lower carbonate, amide III (1.05 ± 0.19), and amide I/III ratio values (0.19 ± 0.06) compared to nonirradiated group (1.42 ± 0.10, 1.28 ± 0.24, and 0.31 ± 0.10, respectively) (P < .05). For medium dentin irradiated group (1.30 ± 0.12) had lower phosphate values compared to nonirradiated group (1.48 ± 0.22) (P < .05). In cementum, there was no statistical difference between the groups.

Conclusion

The radiotherapy was able to cause changes in ν4PO43−, carbonate, and amide III peaks of root dentin.

CONFLICT OF INTEREST

None.

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