Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effect of ultrasonic agitation on push-out bond strength and adaptation of root-end filling materials

  • Alcalde, Murilo Priori (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo) ;
  • Vivan, Rodrigo Ricci (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo) ;
  • Marciano, Marina Angelica (Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas) ;
  • Duque, Jussaro Alves (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo) ;
  • Fernandes, Samuel Lucas (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo) ;
  • Rosseto, Mariana Bailo (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo) ;
  • Duarte, Marco Antonio Hungaro (Department of Restorative Dentistry, Dental Materials and Endodontics, Bauru Dental School, University of Sao Paulo)
  • Received : 2017.12.23
  • Accepted : 2018.03.08
  • Published : 2018.05.31
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Abstract

Objectives: This study evaluated the effect of ultrasonic agitation of mineral trioxide aggregate (MTA), calcium silicate-based cement (CSC), and Sealer 26 (S26) on adaptation at the cement/dentin interface and push-out bond strength. Materials and Methods: Sixty maxillary canines were divided into 6 groups (n = 10): MTA, S26, and CSC, with or without ultrasonic activation (US). After obturation, the apical portions of the teeth were sectioned, and retrograde cavities were prepared and filled with cement by hand condensation. In the US groups, the cement was activated for 60 seconds: 30 seconds in the mesio-distal direction and 30 seconds in the buccal-lingual direction, using a mini Irrisonic insert coupled with the ultrasound transducer. After the materials set, 1.5-mm thick sections were obtained from the apexes. The presence of gaps and the bond between cement and dentin were analyzed using low-vacuum scanning electron microscopy. Push-out bond strength was measured using a universal testing machine. Results: Ultrasonic agitation increased the interfacial adaptation of the cements. The S26 US group showed a higher adaptation value than MTA (p < 0.05). US improved the push-out bond strength for all the cements (p < 0.05). Conclusions: The US of retrograde filling cements enhanced the bond to the dentin wall of the root-end filling materials tested.

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References

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