Shear bond strength of a self-adhesive resin cement to dentin surface treated with Nd:YAG and femtosecond lasers
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ORIGINAL ARTICLE
Shear bond strength of a self-adhesive resin cement to dentin surface treated with Nd:YAG and femtosecond lasers Mahmut Sertaç Özdoğan 1 Filiz Aykent 1
&
Işıl Karaokutan 2 & Mesut Yıldırım 1 & Kübra Aybüke Aydemir 1 & Ahmet Karatay 3 &
Received: 23 April 2020 / Accepted: 27 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract This study aims to evaluate the effect of Nd:YAG and femtosecond lasers irradiation on the shear bond strength (SBS) of a selfadhesive resin cement to the human dentin surface. One hundred extracted third molar teeth were randomly divided into 10 experimental groups according to dentin surface treatments; with and without the bonding agent, Nd:YAG 302 J/cm2 and 440 J/ cm2, femtosecond 4 J/cm2 and 7 J/cm2, and control groups were prepared. After surface treatments, a self-adhesive resin cement was luted by using a bonding jig (Ultradent Products Inc.). The specimens were then subjected to shear test at a crosshead speed of 0.5 mm/min, and failure loads were recorded as megapascal (MPa). Two-way analysis of variance and Tukey HSD tests were performed (p ˂ 0.05). Representative specimens from each experimental subgroup were examined by means of SEM. The highest SBS values were obtained in Group 302 J/cm2 Nd:YAG with bonding agent, and there is no statistical difference between Group 440 J/cm2 Nd:YAG with bonding and Group 7 J/cm2 femtosecond with bonding (p > 0.05). The lowest SBS values were observed in Group control without bonding agent. Nd:YAG and femtosecond laser treatments improved the adhesion between the dentin surface and the self-adhesive resin cement. Keywords Nd:YAG laser . Femtosecond laser . Self-adhesive resin cement . Shear bond strength
Introduction The long-term success of an adhesive fixed restoration mainly depends on the choice of the cement and cementation technique. Adhesion of cement to dental hard tissues may be mechanical, chemical, or the combination of two [1]. Since the introduction of the acid etching technique by Buonocore has provided an improvement in adhesive dentistry [2]. It is well proven that bonding of resin cement to enamel with acid etching technique provides successful adhesion [3, 4]. However chemical composition, its level of moisture, and
* Mahmut Sertaç Özdoğan [email protected] 1
Department of Prosthodontics, Ankara Yıldırım Beyazıt University, Etlik-Keçiören, 06010 Ankara, Turkey
2
Department of Prosthodontics, Pamukkale University, Denizli, Turkey
3
Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Beşevler, Ankara, Turkey
regional morphological variations of dentin make bonding to dentin less reliable [5]. Therefore ablation of dentin with laser in order to prepare suitable bonding surfaces becomes an alternative technique used without any other dentin surface treatments. The majority of authors found that the roughness produced with the laser at least equals the acid etched [6–8]. Various laser systems including CO2, Nd:YAG, and Er:YAG have been used f
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