title: Does 8-methacryloxyoctyl trimethoxy silane (8-MOTS) improve initial bond strength on lithium disilicate glass ceramic?
abstract: Dental ceramic surfaces are modified with silane coupling agents, such as γ-methacryloxypropyl trimethoxy silane (γ-MPTS), to improve bond strength. For bonding between lithium disilicate glass ceramic and resin cement, the objective was to investigate if 8-methacryloxyoctyl trimethoxy silane (8-MOTS) could yield a similar performance as the widely used γ-MPTS.
  
  
  
  One hundred and ten lithium disilicate glass ceramic specimens were randomly divided into 11 groups (n=10) according to pretreatment regime. All specimens were pretreated with a different solution composed of one or a combination of these agents: 10 or 20wt% silane coupling agent of γ-MPTS or 8-MOTS, followed by a hydrolysis solution of acetic acid or 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP). Each pretreated surface was luted to a stainless steel rod of 3.6mm diameter and 2.0mm height with resin cement. Shear bond strength between ceramic and cement was measured after 24-h storage in 37°C distilled water.
  
  
  
  8-MOTS produced the same bonding performance as γ-MPTS. Both silane coupling agents significantly increased the bond strength of resin cement, depending on their concentration. When activated by 10-MDP hydrolysis solution, 20wt% concentration produced the highest values (γ-MPTS: 24.9±5.1MPa; 8-MOTS: 24.6±7.4MPa). Hydrolysis with acetic acid produced lower bond strengths than with 10-MDP.
  
  
  
  Silane coupling pretreatment with 8-MOTS increased the initial bond strength between lithium disilicate glass ceramic and resin cement, rendering the same bonding effect as the conventional γ-MPTS.
authors.affiliation: Department of Occlusion and Removable Prosthodontics, Okayama University, 2-5-1 Shikata-cho, kita-ku, Okayama 700-8525, Japan. Electronic address: ykmar@md.okayama-u.ac.jp.
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Maruo
authors.affiliation: Department of Occlusion and Removable Prosthodontics, Okayama University, 2-5-1 Shikata-cho, kita-ku, Okayama 700-8525, Japan.
authors.forename: Goro
authors.initials: G
authors.lastname: Nishigawa
authors.affiliation: Center for Innovative Clinical Medicine, Okayama University Hospital, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan.
authors.forename: Kumiko
authors.initials: K
authors.lastname: Yoshihara
authors.affiliation: Department of Occlusal and Oral Functional Rehabilitation, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan.
authors.forename: Shogo
authors.initials: S
authors.lastname: Minagi
authors.affiliation: Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Irie
mesh_terms: D002516:Ceramics; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D013499:Surface Properties
chemical_list: D019279:Resin Cements; D012821:Silanes; C493120:lithia disilicate; D003776:Dental Porcelain; C023506:Glass ceramics
keywords: Bond strength; Lithium disilicate glass ceramic; Silane coupling agent