In vitro longevity of bonding properties of universal adhesives to dentin

• Published in: Operative dentistry Vol. 40; no. 3; p. 282
• Main Authors: Muñoz, M A, Luque-Martinez, I, Malaquias, P, Hass, V, Reis, A, Campanha, N H, Loguercio, A D
• Format: Journal Article
• Language: English
• Published: United States 01.05.2015
• Subjects: Dental Bonding - methods; Dental Bonding - standards; Dental Cements - standards; Dental Cements - therapeutic use; Dental Etching - methods; Dental Etching - standards; Dental Stress Analysis; Dentin - metabolism; Dentin-Bonding Agents - standards; Dentin-Bonding Agents - therapeutic use; Humans; In Vitro Techniques; Molar; Resin Cements - standards; Resin Cements - therapeutic use; Tensile Strength; Time Factors
• ISSN: 1559-2863
• DOI: 10.2341/14-055-l

To evaluate the immediate and 6-month resin-dentin bond strength (μTBS) and nanoleakage (NL) of universal adhesives that contain or do not contain methacryloyloxydecyl dihydrogen phosphate (MDP) and are used in the etch-and-rinse and self-etch strategies. Forty caries-free extracted third molars were divided into eight groups for μTBS (n=5). The groups were bonded with the Clearfil SE Bond (CSE) and Adper Single Bond 2 (SB) as controls; Peak Universal, self-etch (PkSe) and etch-and rinse (PkEr); Scotchbond Universal Adhesive, self-etch (ScSe) and etch-and-rinse (ScEr); and All Bond Universal, self-etch (AlSe) and etch-and-rinse (AlEr). After composite restorations, specimens were longitudinally sectioned to obtain resin-dentin bonded sticks (0.8 mm(2)). The μTBS of the specimens was tested immediately (IM) or after 6 months of water storage (6M) at 0.5 mm/min. Some sticks at each storage period were immersed in silver nitrate and photo developed, and the NL was evaluated with scanning electron microscopy. Data were analyzed with two-way repeated-measures analysis of variance and Tukey test (α=0.05). At the IM period, PkSe and PkEr showed μTBS similar to the control adhesives (p>0.05) but increased NL pattern and lower μTBS after 6M (p<0.05). ScSe and ScEr showed intermediary μTBS values at the IM period but remained stable after 6 months (p>0.05). AlSe showed the lowest μTBS (p<0.05), but μTBS and NL remained stable after 6M (p>0.05). AlEr showed higher IM μTBS but showed higher degradation after 6M (p<0.05). Universal adhesives that contain MDP showed higher and more stable μTBS with reduced NL at the interfaces after 6 months of water storage.