Dry-bonding to dentin using alternative conditioners based on iron-containing solutions or nitric acid

Author(s)

Sebold, Maicon ^[1] ; Andre, Carolina Bosso ^[1] ; Carvalho, Ricardo Marins ^[2] ; Giannini, Marcelo ^[1]

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Operat Dent Div, Dept Restorat Dent, Ave Limeira 901, BR-13414903 Piracicaba, SP - Brazil

^[2] Univ British Columbia, Fac Dent, Div Biomat, Dept Oral Biol & Med Sci, 2329 West Mall, Vancouver, BC V6T 1Z4 - Canada

• Document type: Journal article
• Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 94, p. 238-248, JUN 2019.
• Web of Science Citations: 0

Abstract

Objectives: To evaluate the effect of experimental conditioners (10-3 solution - 10-3, 6.8% ferric oxalate - FOX, and 1.4% nitric acid - NI) on dentin elastic modulus, flexural strength, bond strength, failure mode, and adhesive interface morphology of two etch-and-rinse adhesives (XP Bond, Dentsply or One-Step, Bisco) applied on etched thy dentin. Methods: Sound human third molars were used for the microtensile bond strength test (n = 8), performed at 24 h and after one year of water storage. Failure modes were evaluated by scanning electron microscopy. Dentin bonding interface was analyzed by confocal laser scanning microscopy (n = 3). Adhesive systems were applied on phosphoric acid-etched, wet (positive control) and dry (negative control) dentin, and on etched and dry dentin previously treated with 10-3 (15s), FOX (60s), or NI (15s). Bovine dentin bars (n = 15) were immersed into the conditioning solutions and subjected to a three-point bending test. Results: XP Bond + 10-3 or NI resulted in lower bond strength than phosphoric acid. One-Step + 10-3 or NI resulted in bond strengths equivalent to the positive control. Experimental conditioners presented no bond strength reduction after one year, regardless of the bonding agent tested. One-Step resulted in more adhesive failures than XP Bond at 24 h, and mixed failures increased after storage. All experimental conditioners promoted hybridization and resin tags formation, except FOX. Dentin elastic modulus was not affected by the conditioners, whereas flexural strength was significantly reduced by FOX. Conclusions: Adequate and stable dentin bonds were achieved when the bonding agents were applied on 10-3 or NI-treated dentin. None of the experimental conditioners reduced dentin elastic modulus, but dentin flexural strength was significantly reduced by FOX-conditioning. (AU)

• FAPESP's process: 15/03927-3 - Evaluation of the resin-dentin bond using different approaches in dentin conditioning
• Grantee: Maicon Sebold
• Support Opportunities: Scholarships in Brazil - Master