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Title: 1903 - Bonding Performance of Universal Adhesives Applied on Air-abraded Dentine

Authors:

Paula Pires, Federal University of Rio de Janeiro
Maria Martins, Federal University of Ceará
Aline de Almeida Neves, Federal University of Rio de Janeiro
Irina Makeeva, Sechenov University - Moscow
Vicente Saboia, Federal University of Ceará
Victor Feitosa, Paulo Picanço School of Dentistry
Salvatore Sauro (Presenter)
CEU Carndenal Herrera University

Abstract:

Objectives: The study aimed at evaluating the bonding performance and the interfacial ultramorphology of two universal bonding systems applied in etch-and-rinse or self-etch mode on air-abraded dentine.

Methods: Twelve dentine specimens per group were air-abraded (50 PSI; 5 mm) using Bioglass 45S5 (BAG), Alumina 29 µm (AL), or polished using SiC grit-#500 papers (Control). Half of the specimens were bonded in etch-and-rinse (ER) mode and half in self-etch (SE) mode using two universal adhesives: (UBQ: Clearfil Quick Bond, Kuraray-Noritake) or (ABU: All bond universal, BISCO) as per manufacturer’s instructions. Composite build-ups was made using a nano-filled composite (CLEARFIL MAJESTY ES-2, Kuraray). Specimens were stored in distilled water (37οC; 24 h) and submitted to the microtensile bond strength (MTBS). Failure mode was determined using the stereomicroscope, while fractographic analysis was performed through SEM. Resin-dentine slabs were prepared and immersed in Rhodamine B (3 h). These were analysed for confocal interface ultramorphology.

Results: Air-abrasion had not influence (p>.05) on the bonding performance of ABU; no significant difference was encountered (p>.05) when ABU was applied in ER or SE mode. Failure mode was prevalently mixed in all groups. Conversely, the bonding performance of UBQ was influence (p<.05) by the air-abrasion; SE+BAG group had significant lower bond strength compared to SE+AL (p<.05), but similar to the control group (p>.05). Failure mode was prevalently mixed in all ER groups and adhesives in SE groups. Nanoleakage (confocal microscopy) was observed in all ER groups, but less evident in SE groups. In particular, SE+BAG groups showed a lack of hybrid layer formation.

Conclusions: Air-abrasion dentine pre-treatment does not interfere with the bonding performance of universal adhesives. However, the use of alkaline bioactive glass for air-abrasion might reduce the immediate bond strength of self-etch adhesives developed for “quick” application.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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