title: Influence of dentin substrates to simplify wet-bonding: a leakage-free and reliable tensile strength interface for long-lasting restorations.
abstract: The wet-bonding procedure can be simplified by eliminating the primer. An aqueous mixture of 1% citric acid and 1% ferric chloride (1-1) was hypothesized as providing an easier dehydratable thinner substrate to which 4-META/MMA-TBB resin can adhere reliably. The 1-1 was applied for 10 s and rinsed off with water for 10 s. Demineralized dentin under four conditions was prepared before bonding to PMMA rod using 4-META/MMA-TBB resin: air-dried 10 s (D-NP); air-dried 10 s, primed 60 s with 5% 4-META in acetone (D-P); blotted dry 10 s (W-NP); blotted dry 10 s, primed 60 s (W-P). The tensile strengths (MPa) using mini-dumbbell specimens were 4.0 ± 2.4 for D-NP, 10.6 ± 5.4 for D-P, 38.3 ± 4.4 for W-NP, and 42.9 ± 3.3 for W-P. There was no significant difference between W-NP and W-P with cohesive failure in the dentin and the cured resin. In the wet groups, the hybridized dentin was stable against both HCl and NaOCl challenges. TEM examination and a leakage tests confirmed a perfect seal with a leakage-free interface of W-NP. These results suggest that this primer-less wet-bonding is promising method to protect the underlying intact dentin and pulp, thus providing long-lasting dental treatment.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand. tmorakot@chula.ac.th
authors.forename: Morakot
authors.initials: M
authors.lastname: Piemjai
authors.forename: Onusa
authors.initials: O
authors.lastname: Waleepitackdej
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nakabayashi
mesh_terms: D002712:Chlorides / Q000737:chemistry; D019343:Citric Acid / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods; D003804:Dentin / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008963:Molar / Q000473:pathology; D010539:Permeability; D011108:Polymers / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D014070:Tooth / Q000473:pathology
chemical_list: D002712:Chlorides; D005290:Ferric Compounds; D011108:Polymers; D019343:Citric Acid; C024555:ferric chloride