Interfacial morphology of self-etching adhesive systems in dentin.
OBJECTIVE
To portray and assess the interfacial morphology achieved with self-etching systems in dentin under observation by scanning electron microscopy.


METHODS
Ten caries-free extracted erupted human third molars were used in this study. The occlusal enamel was removed, and 10 dentin disks with a thickness of 800 +/- 200 Microm were obtained by slow-speed sectioning with a diamond saw parallel to the occlusal surface. A standard smear layer was created on the occlusal surface by wet sanding with 600-grit sandpaper for 60 seconds. The dentin disks were randomly assigned to one of the systems: AdheSE (Ivoclar Vivadent), Optibond Solo Plus-Self-Etch (Kerr), Tyrian SPE (Bisco) as self-etching primers, and Adper Prompt Self-Etch (3M Espe) and One-Up Bond F (Tokuyama) as self-etching adhesives. All systems were applied according to the manufacturers' instructions. After application of the adhesive systems, a 1.0-mm-thick layer of a flowable composite resin (Filtek Flow; 3M Espe) was applied to the treated dentin surface and light cured for 40 seconds. The specimens were then processed for observation by scanning electron microscopy.


RESULTS
All self-etching systems achieved the formation of sealed interfaces and hybridized areas with variable extents except for the self-etching adhesive One-Up Bond F, which showed some gap formation and poor hybridization. Optibond Solo Plus-Self-Etch presented a more consistent adhesive interface with thicker hybrid layers, numerous resin tags, and lateral branches.


CONCLUSIONS
Regarding the micromorphology aspect, Optibond Solo Plus-Self-Etch showed the finest result, while One-Up Bond F was not able to produce a satisfactory ultrastructural morphology.
Sensi
Luis Guilherme
LG
Department of Endodontics, Prosthodontics, and Operative Dentistry, University of Maryland Dental School, Baltimore, MD, USA. lsensi@umaryland.edu <lsensi@umaryland.edu>
Marson
Fabiano Carlos
FC
Belli
Renan
R
Baratieri
Luiz Narciso
LN
Monteiro
Sylvio
S
D000134:Acid Etching, Dental / Q000379:methods; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008963:Molar; D013499:Surface Properties
D017220:Dentin-Bonding Agents