Enhanced hydrolytic stability of dental composites by use of fluoroalkyltrimethoxysilanes.
The hydrolytic stability of a group of experimental composite materials was evaluated. Seven distinct composites were formed by the mixing of a resin monomer mixture with silica filler that had been pre-treated with one of 7 different ethanol solutions. In one case, the filler was treated with an ethanol solution that contained only 3-methacryloyloxypropyltrimethoxysilane. In 5 cases, it was treated with solution containing a mixture of 3-methacryloyloxypropyltrimethoxysilane and one of the following hydrophobic fluoroalkyltrimethoxysilanes: trifluoropropyl-, nonafluorohexyl-, tridecafluorooctyl-, heptadecafluorodecyl-, and henicosafluorododecyl-trimethoxysilane. The tensile strength, after being immersed in water for 1800 days, of 2 of the experimental composites, whose pre-treatment regimen had included a fluoroalkyltrimethoxysilane, was significantly higher than that of the composite whose pre-treatment regimen had not included a fluoroalkyltrimethoxysilane. Moreover, there was no significant difference between the tensile strength of fresh samples of these 2 composites and the tensile strength of identically produced samples that had remained under water for 1800 days or that had been subjected to 30,000 cycles of thermal stress.
Nihei
T
T
Department of Operative Dentistry and Endodontics, Kanagawa Dental College, Inaoka-cho, Yokosuka, Japan. niheitom@kdcnet.ac.jp
Kurata
S
S
Kondo
Y
Y
Umemoto
K
K
Yoshino
N
N
Teranaka
T
T
D000042:Absorption; D000473:Alkanes / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D006868:Hydrolysis; D057927:Hydrophobic and Hydrophilic Interactions; D007101:Immersion; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012827:Silicone Oils / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties; D013718:Tensile Strength; D013816:Thermodynamics; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability
D000473:Alkanes; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D012821:Silanes; D012827:Silicone Oils; D012997:Solvents; D014867:Water; C017492:methacryloxypropyltrimethoxysilane; D000431:Ethanol; C054077:fluorosilicone oil; D012822:Silicon Dioxide; C071717:trimethoxysilane