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BioMed Research International
Volume 2015, Article ID 798972, 6 pages
Research Article

Tensile Bond Strengths of Two Adhesives on Irradiated and Nonirradiated Human Dentin

1UFR d’Odontologie, Université Lyon 1, Université de Lyon, 11 rue Guillame Paradin, 69372 Lyon, France
2Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, 6-8 Place Deperet, 69365 Lyon, France
3Laboratoire des Multimatériaux et Interfaces, CNRS UMR 5615, Université Lyon 1, Université de Lyon, 11 rue Guillaume Paradin, 69372 Lyon, France
4Département de Santé Publique, Institut des Sciences Pharmaceutiques et Biologiques (ISPB), EA4173, Université Lyon 1, Université de Lyon, 8 avenue Rockefeller, 69373 Lyon, France

Received 16 July 2015; Accepted 11 August 2015

Academic Editor: Ahmet U. Güler

Copyright © 2015 Cécile Bernard et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this study was to assess the effect of radiotherapy on bond efficiency of two different adhesive systems using tensile bond strength test. Twenty extracted teeth after radiotherapy and twenty nonirradiated extracted teeth were used. The irradiation was applied in vivo to a minimal dose of 50 Gy. The specimens of each group were randomly assigned to two subgroups to test two different adhesive systems. A three-step/etch-and-rinse adhesive system (Optibond FL) and a two-steps/self-etch adhesive system (Optibond XTR) were used. Composite buildups were performed with a nanohybrid composite (Herculite XTR). All specimens were submitted to thermocycling ageing (10000 cycles). The specimens were sectioned in 1 mm2 sticks. Microtensile bond strength tests were measured. Nonparametric statistical analyses were performed due to nonnormality of data. Optibond XTR on irradiated and nonirradiated teeth did not show any significant differences. However, Optibond FL bond strength was more effective on nonirradiated teeth than on irradiated teeth. Within the limitations of an in vitro study, it can be concluded that radiotherapy had a significant detrimental effect on bond strength to human dentin. However, it seems that adhesive choice could be adapted to the substrata. According to the present study, the two-steps/self-etch (Optibond XTR) adhesive system tested could be more effective on irradiated dentin compared to three-steps/etch-and-rinse adhesive system (Optibond FL).