Assessing the performance of a methyl methacrylate-based resin cement with self-etching primer for bonding orthodontic brackets.
Questions over the usefulness of a self-etching primer with resin adhesive in the bonding of orthodontic brackets remain unsolved. The purpose of this study was to determine the effects of using Multibond, a new methyl methacrylate (MMA)-based resin cement with self-etching primer, on the shear bond strength of orthodontic brackets compared with Superbond C&B, which is a well-known MMA-based resin cement containing phosphoric acid etching. Metal or plastic brackets were bonded to etched or self-etching primed bovine teeth using Superbond C&B or Multibond. The shear bond strengths were measured after immersion in water at 37 degrees C for 24 hours. Data were analyzed by two-way analysis of variance and Scheffe's test. The surface appearances of the teeth after phosphoric acid etching or self-etching priming were observed by field-emission scanning electron microscopy (FE-SEM). Metal brackets bonded with Multibond had a significantly lower shear bond strength than metal brackets bonded with Superbond C&B. No significant differences in shear bond strength were observed between Multibond and Superbond C&B when plastic brackets were bonded to the enamel. The shear bond strength of metal brackets bonded with Multibond was comparable with that of plastic brackets bonded with Superbond C&B. Adhesive remnant index score showed a tendency of more residual resin cement remaining on the teeth when metal brackets were bonded with Multibond. FE-SEM observation revealed less dissolution of the enamel surface resulting from treatment with Multibond self-etching primer as compared with phosphoric acid. Thus, the Multibond system may be a candidate for bonding orthodontic brackets with the advantage of minimizing enamel loss.
Kawasaki
Mayuko
M
Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
Hayakawa
Tohru
T
Takizawa
Tsutomu
T
Sirirungrojying
Somsak
S
Saitoh
Kayo
K
Kasai
Kazutaka
K
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D002417:Cattle; D016009:Chi-Square Distribution; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D010969:Plastics / Q000737:chemistry; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties
D001896:Boron Compounds; D003722:Dental Alloys; D008689:Methacrylates; D008768:Methylmethacrylates; C482145:Multibond; D010756:Phosphoric Acids; D010969:Plastics; D019279:Resin Cements; D020366:Methylmethacrylate; C049495:Super-bond