Influence of Nd:YAG laser on the bond strength of self-etching and conventional adhesive systems to dental hard tissues

Journal Article

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Operative dentistry

Oper.Dent.

Jul-Aug

447

455

JID: 7605679; 0 (Composite Resins); 0 (Dental Materials); 0 (Dentin-Bonding Agents); 0 (Filtek Z250); 0 (Phosphoric Acids); 0 (Xeno III); 0 (single bond); 059QF0KO0R (Water); 454I75YXY0 (Bisphenol A-Glycidyl Methacrylate); E4GA8884NN (phosphoric acid); 20

United States

1559-2863; 0361-7734

PMID: 23215546

eng

Comparative Study; Journal Article; D

10.2341/11-383-L [doi]

Unknown(0)

23215546

PURPOSE: The aim of this study was to investigate the influence of Nd:YAG laser on the shear bond strength to enamel and dentin of total and self-etch adhesives when the laser was applied over the adhesives, before they were photopolymerized, in an attempt to create a new bonding layer by dentin-adhesive melting. MATERIAL AND METHODS: One-hundred twenty bovine incisors were ground to obtain flat surfaces. Specimens were divided into two substrate groups (n=60): substrate E (enamel) and substrate D (dentin). Each substrate group was subdivided into four groups (n=15), according to the surface treatment accomplished: X (Xeno III self-etching adhesive, control), XL (Xeno III + laser Nd:YAG irradiation at 140 mJ/10 Hz for 60 seconds + photopolymerization, experimental), S (acid etching + Single Bond conventional adhesive, Control), and SL (acid etching + Single Bond + laser Nd:YAG at 140 mJ/10 Hz for 60 seconds + photopolymerization, experimental). The bonding area was delimited with 3-mm-diameter adhesive tape for the bonding procedures. Cylinders of composite were fabricated on the bonding area using a Teflon matrix. The teeth were stored in water at 37 degrees C/48 h and submitted to shear testing at a crosshead speed of 0.5 mm/min in a universal testing machine. Results were analyzed with three-way analysis of variance (ANOVA; substrate, adhesive, and treatment) and Tukey tests (alpha=0.05). ANOVA revealed significant differences for the substrate, adhesive system, and type of treatment: lased or unlased (p0.05). The mean shear bond strength values (MPa) for the enamel groups were X=20.2 +/- 5.61, XL=23.6 +/- 4.92, S=20.8 +/- 4.55, SL=22.1 +/- 5.14 and for the dentin groups were X=14.1 +/- 7.51, XL=22.2 +/- 6.45, S=11.2 +/- 5.77, SL=15.9 +/- 3.61. For dentin, Xeno III self-etch adhesive showed significantly higher shear bond strength compared with Single Bond total-etch adhesive; Nd:YAG laser irradiation showed significantly higher shear bond strength compared with control (unlased). CONCLUSION: Nd:YAG laser application prior to photopolymerization of adhesive systems significantly increased the bond strength to dentin.

Marimoto,A.K., Cunha,L.A., Yui,K.C., Huhtala,M.F., Barcellos,D.C., Prakki,A., Goncalves,S.E.

Department of Restorative Dentistry, Sao Jose dos Campos School of Dentistry, UNESP- Univ Estadual Paulista, Sao Paulo, Brazil.

20121205

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=23215546

2013