Effect of base monomer's refractive index on curing depth and polymerization conversion of photo-cured resin composites.
In this study, we examined the effect of the transmitted amount of visible light through a resin composite on the curing depth and polymerization conversion. Transmitted amount of visible light was strongly dependent on the magnitude of refractive index difference that existed between the resin and silica filler. More specifically, the differences arose from the type of base monomer used. The transmitted amount of visible light exhibited a good correlation with the curing depth and Knoop hardness ratio of the bottom surface against the top surface of the resin composite. To improve the polymerization conversion of the cavity floor, it is important to reduce the refractive index difference that exists between the base resin and silica filler.
Fujita
Kou
K
Department of Dental Caries Control and Aesthetic Dentistry, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan. kou@mascat.nihon-u.ac.jp
Nishiyama
Norihiro
N
Nemoto
Kimiya
K
Okada
Tamami
T
Ikemi
Takuji
T
D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D006244:Hardness; D006801:Humans; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D055095:Optics and Photonics; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012031:Refractometry; D012822:Silicon Dioxide / Q000737:chemistry / Q000528:radiation effects; D013499:Surface Properties; D013696:Temperature
C074234:BMPEPP monomer; D003188:Composite Resins; D008689:Methacrylates; D011108:Polymers; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D012822:Silicon Dioxide