Effect of ultrasonic agitation on push-out bond strength and adaptation of root-end filling materia
Alcalde Murilo Priori, Marciano Marina Angelica, Duque Jussaro Alves, Fernandes Samuel Lucas, Rosseto Mariana Bailo, Duarte Marco Antonio Hungaro,
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( Alcalde Murilo Priori ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
( Marciano Marina Angelica ) - State University of Campinas School of Dentistry of Piracicaba Department of Restorative Dentistry
( Duque Jussaro Alves ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
( Fernandes Samuel Lucas ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
( Rosseto Mariana Bailo ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
( Duarte Marco Antonio Hungaro ) - University of Sao Paulo Bauru Dental School Department of Restorative Dentistry, Dental Materials and Endodontics
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.
키워드
Endodontics; Retrograde obturation; Ultrasonics
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