Dental and Medical Problems

Dent Med Probl
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Dental and Medical Problems

2019, vol. 56, nr 2, April-June, p. 143–148

doi: 10.17219/dmp/105408

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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The effect of dentin pre-treatment with activated riboflavin on the bond strength of a two-step self-etch adhesive system

Wpływ wstępnego pokrycia zębiny aktywowaną ryboflawiną na siłę wiązania dwustopniowego samotrawiącego systemu adhezyjnego

Shahin Kasraei1,A,E,F, Maryam Mojtahedi2,B,C,D, Mohammad-Taghi Goodarzi3,A,C,E, Mohadese Azarsina4,A,D,F, Zahra Khamverdi1,B,E

1 Department of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran

2 School of Dentistry, Hamadan University of Medical Sciences, Iran

3 Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Iran

4 Department of Operative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Abstract

Background. The cross-linking of collagen fibers in the hybrid layer has been suggested as a way to create more durable bonds.
Objectives. This study evaluated the effect of visible light-activated riboflavin (RF) as a cross-linking agent on the durability of the dentin microtensile bond strength (μTBS) in a 2-step self-etch (SE) adhesive system.
Material and Methods. The occlusal surfaces of 21 human premolar teeth were ground down to expose the dentin, and were then randomly divided into 3 groups. The Clearfil® SE Bond was used in the control group. In the RF/BL group, a 0.1 wt% aqueous solution of RF was applied to the dentin surface before applying the adhesive and irradiating with blue light (BL) for 2 min. In the 3rd group, the RF-P/BL group, the RF powder was added to the adhesive primer (P) at a concentration of 0.1 wt%. The teeth were built up using composite resin. After thermocycling, 14 resin–dentin beams from each group were prepared and stored in water for 3 months. The μTBS was determined and the data was analyzed using a linear model with a generalized estimating equation (GEE) (p = 0.05).
Results. The highest and the lowest μTBS belonged to the control group (41.15 ±3.50 MPa) and the RF-P/BL group (19.84 ±3.80 MPa), respectively. The mean μTBS in the control group was significantly higher than in the RF/BL and RF-P/BL groups (p < 0.001), but no significant difference was found between the RF/BL and RF-P/BL groups (p = 0.598).
Conclusion. Pre-treatment of dentin surfaces with RF activated with BL had a negative impact on the μTBS of the Clearfil SE Bond as a 2-step SE adhesive.

Key words

collagen, riboflavin, cross-linking agents, dentin bonding agents, photoactivation

Słowa kluczowe

kolagen, ryboflawina, środki sieciujące, zębinowe środki wiążące, fotoaktywacja

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