title: Bonding durability between orthodontic brackets and human enamel treated with megabond self-etching primer using 4-META/MMA-TBB resin cement.
abstract: The purpose of this study was to determine the bonding durability when a Megabond self-etching primer is used with 4-META/MMA-TBB resin to bond metal orthodontic brackets to human premolar enamel. Three conditions of enamel were prepared: Megabond self-etching primer without saliva contamination, Megabond self-etching primer with saliva contamination, and repeat Megabond self-etching priming after saliva contamination. Shear bond strengths were measured after immersion in water at 37 degrees C for 24 hours, or after 2000 or 5000 cycles of thermal cycling between 5 degrees C and 55 degrees C. There were no significant differences in shear bond strength among the three groups not only before thermal cycling, but also after thermal cycling. FE-SEM observation revealed the presence of saliva and reduced amount of resin tag formation after saliva contamination. The present study provided the evidence in human teeth that when using 4-META/MMA-TBB resin, Megabond self-etching primer treatment produced tight bonding even when surface was contaminated with saliva.
authors.affiliation: Department of Orthodontics, Nihon University Graduate School of Dentistry at Matsudo, 2-870-1, Sakaecho Nishi, Matsudo, Chiba 271-8587, Japan. somsak@mascat.nihon-u.ac.jp
authors.forename: Somsak
authors.initials: S
authors.lastname: Sirirungrojying
authors.forename: Tohru
authors.initials: T
authors.lastname: Hayakawa
authors.forename: Kayo
authors.initials: K
authors.lastname: Saito
authors.forename: Daijiro
authors.initials: D
authors.lastname: Meguro
authors.forename: Kimiya
authors.initials: K
authors.lastname: Nemoto
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kasai
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D001641:Bicuspid; D001896:Boron Compounds; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning / Q000379:methods; D016910:Orthodontic Brackets; D011109:Polymethacrylic Acids; D019279:Resin Cements; D012463:Saliva; D033081:Shear Strength
chemical_list: C476988:4-methacryloxyethyltrimellitic acid-methylmethacrylate-tributylborane; D001896:Boron Compounds; D017220:Dentin-Bonding Agents; C472989:Megabond self-etching primer; D008689:Methacrylates; D008768:Methylmethacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C049495:Super-bond