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Effect of gamma radiation on bonding to human enamel and dentin

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Abstract

Purposes

This study evaluated the effect of gamma radiation on the microtensile bond strength of resin-based composite restoration to human enamel and dentin performed either before or after radiotherapy.

Methods

Thirty sound human third molars were sectioned mesio-distally into buccal and lingual halves and then randomly divided into enamel or dentin groups. Enamel and dentin substrates were randomly divided into three sub-groups (n = 10): Control, which received no irradiation; specimens were irradiated before restoration protocol; and specimens were irradiated after restoration protocol. Radiation therapy was defined by application of 60-Gy dose fractionally with daily exposures of 2 Gy, 5 days a week, over 6 weeks. Restorations were carried out using Adper Single Bond adhesive system and Filtek Z250 resin composite. The specimens were sectioned producing 4 sticks per specimen and submitted to microtensile on a testing machine. Data were submitted to two-way ANOVA followed by Tukey test (p < 0.05). Failure modes were examined under optical microscopy and SEM.

Results

Bond strength to enamel was significantly higher than to dentin irrespective radiation therapy. Radiotherapy applied before restoration significantly reduced the bond strength to both substrates. A predominance of adhesive failures was detected for control groups and groups restored before radiotherapy. Cohesive failures in dentin and enamel increased when the specimens were restored after irradiation.

Conclusions

The gamma radiation had a significant detrimental effect on bond strength to human enamel and dentin when the adhesive restorative procedure was carried out after radiotherapy.

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Acknowledgments

The authors are grateful to FAPEMIG for financial support. Authors are indebted to Dr. E.W. Kitajima, Dr. F.A.O. Tanaka and R.B. Salaroli (NAP/MEPA-ESALQ/USP, Brazil) for SEM equipment support.

Conflict of interest

None.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, University of Campinas—UNICAMP, P.O. Box 52, Av. Limeira, 901, 13414-903, Piracicaba, São Paulo, Brazil

    Lucas Z. Naves & Lourenço Correr-Sobrinho

  2. Operative Dentistry and Dental Materials Department, School of Dentistry, Biomechanics Research Group, Federal University of Uberlândia, Av. Pará, 1720, 38405-902, Uberlândia, Minas Gerais, Brazil

    Lucas Z. Naves, Veridiana R. Novais & Carlos J. Soares

  3. Department of Operative Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, 52242-1001, USA

    Steven R. Armstrong

Authors
  1. Lucas Z. Naves
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  2. Veridiana R. Novais
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  3. Steven R. Armstrong
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  4. Lourenço Correr-Sobrinho
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  5. Carlos J. Soares
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Correspondence to Carlos J. Soares.

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Naves, L.Z., Novais, V.R., Armstrong, S.R. et al. Effect of gamma radiation on bonding to human enamel and dentin. Support Care Cancer 20, 2873–2878 (2012). https://doi.org/10.1007/s00520-012-1414-y

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  • DOI: https://doi.org/10.1007/s00520-012-1414-y

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