Dry bonding to dentin : broadening the moisture spectrum and increasing wettability of etch-and-rinse adhesives
Stape, Thiago Henrique Scarabello; Uctasli, Merve; Cibelik, Hatice Sümeyye; Tjäderhane, Leo; Tezvergil-Mutluay, Arzu (2021-11-03)
Thiago Henrique Scarabello Stape, Merve Uctasli, Hatice Sümeyye Cibelik, Leo Tjäderhane, Arzu Tezvergil-Mutluay, Dry bonding to dentin: Broadening the moisture spectrum and increasing wettability of etch-and-rinse adhesives, Dental Materials, Volume 37, Issue 11, 2021, Pages 1676-1687, ISSN 0109-5641, https://doi.org/10.1016/j.dental.2021.08.021.
© 2021 The Authors. Published by Elsevier Inc. on behalf of The Academy of Dental Materials. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2022020417614
Tiivistelmä
Abstract
Objectives: To determine whether the effect of dentin moisture on the etch-and-rinse bonding may be minimized by dry-bonding protocols utilizing aqueous or ethanolic dimethyl sulfoxide (DMSO) pretreatments.
Methods: H₃PO₄-etched mid-coronal dentin surfaces from human molars were randomly blot- or air-dried for 30 s and pretreated with DMSO/H₂O or DMSO/EtOH solutions. Untreated samples served as control. Moisture control was performed by either blot- or air-drying. Samples were bonded with a multistep etch-and-rinse adhesive. Restored crown segments (n = 8/group) were stored in distilled water for 24 h and sectioned for microtensile bond strength testing. Resin-dentin beams (0.8 mm²) were tested under tension until fracture (0.5 mm/min) after 24 h and two years of storage in artificial saliva at 37 °C. SEM nanoleakage evaluation was performed on aged samples. Collagen wettability was also measured by sessile drops of the hydrophilic and hydrophobic bonding resins (n = 8/group). Data were examined by factorial ANOVA followed by the Tukey test (α = 0.05).
Results: Dry bonding to untreated collagen produced inferior immediate and long-term bond strengths than wet bonding (p< 0.05). Regardless of initial hydration and moisture control, DMSO-dry bonding produced initially higher and stable bond strengths after aging (p<0.05). DMSO-pretreated groups presented improved collagen wettability with lower silver uptake (p<0.05).
Significance: Despite the common belief that etch-and-rinse adhesives must be applied onto moist collagen, DMSO-dry bonding protocols not only improved bonding performance and hybrid layer integrity, but also brought more versatility to collagen hybridization by reducing overdrying-related issues.
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