title: Cytotoxicity of orthodontic bonding adhesive resins on human oral fibroblasts.
abstract: There is little information concerning the cytotoxic effects of no-mix and flowable adhesives used in orthodontics. The aim of the present study was to evaluate the cytotoxic effects of a no-mix (Unite), a light-cured (Tranbond XT), and a flowable (Denfil Flow) adhesives on human oral fibroblasts. Twelve discs of each adhesive were prepared and aged for 1, 3, 5, and 7 days in Dulbecco's Modified Eagle's Medium (DMEM). Cell viability was assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and the difference between the groups was tested by analysis of variance and Tukey tests (α = 0.05). After 1 day of storage, the no-mix adhesive showed moderate cytotoxic effects (P < 0.05), while the light-cured and flowable adhesives were essentially non-cytotoxic. Ageing considerably reduced the cytotoxicity of the no-mix adhesive. On days 5 and 7 of the experiment, the cell viability of three adhesives did not differ significantly (P > 0.05), but cell viability was slightly reduced on day 7. Moderate cytotoxic effects of no-mix adhesive on the first day of the experiment suggest that care should be taken to protect dentists and patients when these adhesives are being handled. Despite higher resin components, the flowable adhesive showed excellent biocompatibility.
authors.affiliation: Department of Orthodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Iran.
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Ahrari
authors.forename: Jalil
authors.initials: J
authors.lastname: Tavakkol Afshari
authors.forename: Maryam
authors.initials: M
authors.lastname: Poosti
authors.forename: Azam
authors.initials: A
authors.lastname: Brook
mesh_terms: D000180:Acrylic Resins / Q000633:toxicity; D000704:Analysis of Variance; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D001840:Dental Bonding; D005347:Fibroblasts / Q000187:drug effects; D005881:Gingiva / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000633:toxicity*; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; C503708:Denfil Flow; D019279:Resin Cements; C477790:Transbond XT; C045638:Unite dental cement