Bond strength of composite resin/universal adhesive to dentin submitted to radiotherapy

  • Fabiana De Goes Paiola Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
  • Aline Evangelista Souza-Gabriel Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
  • Vitoria Leite Paschoini Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
  • Alexandra Mussolino de Queiroz Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
  • Antônio Miranda Cruz-Filho Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.


Aim: To evaluate the bond strength of a universal adhesive system to dentin submitted to radiotherapy.
Materials and Methods: Sixty extracted human teeth were divided into two groups (n = 30): without radiotherapy (control); with radiotherapy, according to the adhesive protocol (n=15): ER-etch-and-rinse (acid + Single Bond Uni-versal); SE-self-etch (Single Bond Universal). The analyzes were shear bond strength (SBS) (n=10), failure pattern (n=10) and scanning electron microscopy (n=5). Data was analyzed by a two-way ANOVA (α =0.05).
Results: The radiotherapy decreased SBS of the restorative material to dentin (p<0.0001). The ER protocol provided lower bond strength values (p<0.001). The predominant type of fracture without radiotherapy was mixed (SE), cohesive to the material (ER). Both protocols presented adhesive failures with radiotherapy. Teeth had a hybrid layer and long resin tags (without radiotherapy) and few tags (with radiotherapy).
Conclusions: The SE adhesive mode favors the shear bond strength of resin to dentin in teeth submitted to radiotherapy.
Keywords: Dental Cements; Adhesives; Dental bonding; Self-curing of dental Resins; radiation treatment; Dentin.


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How to Cite
DE GOES PAIOLA, Fabiana et al. Bond strength of composite resin/universal adhesive to dentin submitted to radiotherapy. Journal of Oral Research, [S.l.], v. 12, n. 1, p. 204-216, nov. 2023. ISSN 0719-2479. Available at: <>. Date accessed: 08 dec. 2023. doi: