Restor Dent Endod.  2018 May;43(2):e23. 10.5395/rde.2018.43.e23.

Effect of ultrasonic agitation on push-out bond strength and adaptation of root-end filling materials

• Alcalde MP
• Vivan RR
• Marciano M
• Duque JA
• Fernandes
• Rosseto MB
• Duarte MA

• KMID: 2416523
• DOI: http://doi.org/10.5395/rde.2018.43.e23

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.

Keyword

Endodontics; Retrograde obturation; Ultrasonics

MeSH Terms

Calcium
Dentin
Dihydroergotamine*
Endodontics
Hand
Microscopy, Electron, Scanning
Miners
Pemetrexed
Retrograde Obturation
Tooth
Transducers
Ultrasonics*
Ultrasonography
Calcium
Dihydroergotamine
Pemetrexed