title: Effect of the combination of dithiooctanoate monomers and acidic adhesive monomers on adhesion to precious metals, precious metal alloys and non-precious metal alloys.
abstract: This study investigated the effect of the combination of a dithiooctanoate monomer and an acidic adhesive monomer on adhesion to precious metals, precious and non-precious metal alloys. From a selection of four dithiooctanoate monomers and six acidic adhesive monomers, 14 experimental primers containing a combination of 5.0 wt% of a dithiooctanoate monomer and 1.0 wt% of an acidic adhesive monomer in acetone were prepared. Tensile bond strengths (TBSs) of MMA-PMMA/TBBO resin to nine kinds of precious metals, precious metal alloys, and non-precious metal alloys after 2,000 thermal cycles were measured. Results showed that there were no significant differences in TBS among the primers to all the precious and non-precious metal adherends tested (p>0.05). Highest TBS values (46.5-55.8 MPa) for bonding to Au alloy, Au-Ag-Pd alloy, Co-Cr alloy, and Ni-Cr alloy were achieved with the primer which contained 5.0 wt% 10-methacryloyloxydecyl 6,8-dithiooctanoate (10-MDDT) and 1.0 wt% 6-methacryloyloxyhexyl phosphonoacetate (6-MHPA). Therefore, 5.0 wt% 10-MDDT and 1.0 wt% 6-MHPA was determined as the optimal combination for bonding to precious metals, precious and non-precious metal alloys.
authors.affiliation: Department of Research and Development, Shofu Inc., 11 Kamitakamatsu-cho, Fukuine, Higashiyama-ku, Kyoto, Japan. k-ikemura@shofu.co.jp
authors.forename: Kunio
authors.initials: K
authors.lastname: Ikemura
authors.forename: Katsunori
authors.initials: K
authors.lastname: Kojima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Endo
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kadoma
mesh_terms: D002210:Caprylates / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D006046:Gold / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D010746:Phosphonoacetic Acid / Q000031:analogs & derivatives / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C546895:6-methacryloyloxyhexyl phosphonoacetate; D002210:Caprylates; D002264:Carboxylic Acids; D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D008689:Methacrylates; D063065:Organophosphonates; D014867:Water; D020366:Methylmethacrylate; D012834:Silver; D010984:Platinum; D010165:Palladium; C005044:hydroxyethyl methacrylate; D006046:Gold; D019904:Polymethyl Methacrylate; D010746:Phosphonoacetic Acid; C031492:octanoic acid