title: Effect of LED and halogen light curing on polymerization of resin-based composites.
abstract: The clinical performance of light polymerized resin-based composites (RBCs) is greatly influenced by the quality of the light curing unit (LCU). A commonly used unit for polymerization of RBC material is the halogen LCUs. However, they have some drawbacks. Development of new blue superbright light emitting diodes (LED LCU) of 470 nm wavelengths with high light irradiance offers an alternative to standard halogen LCU. The aim of this study is compared the effectiveness of LED LCU and halogen LCU on the degree of conversion (DC) of different resin composites [two hybrid (Esthet-X, Filtek Z 250), four packable (Filtek P60, Prodigy Condensable, Surefil, Solitaire), one ormocer-based resin composite (Admira)]. The DC values of RBCs polymerized by LED LCU and halogen LCU ranged approximately from 61.1 +/- 0.4 to 50.6 +/- 0.6% and from 55.6 +/- 0.7 to 47.4 +/- 0.5%, respectively. Significantly higher DC of RBCs except Surefil and Filtek Z 250 was obtained for LED LCU compared with halogen LCU (P < 0.05). Surefil and Filtek Z 250 exhibited no statistically significant difference values between LED LCU and halogen LCU (P > 0.05). As a result, it was observed that the performance of LED LCU used in the study was satisfactory clinically and had sufficient irradiance to polymerize RBCs (hybrid, packable and ormocer based) at 2 mm depth with a curing time of 40 s.
authors.affiliation: Department of Operative Dentistry and Endodontics, Faculty of Dentistry, University of Gazi, Ankara, Turkey. oyabala@gazi.edu.tr
authors.forename: O
authors.initials: O
authors.lastname: Bala
authors.forename: A
authors.initials: A
authors.lastname: Olmez
authors.forename: S
authors.initials: S
authors.lastname: Kalayci
mesh_terms: D003188:Composite Resins / Q000528:radiation effects*; D003793:Dental Restoration, Permanent / Q000379:methods; D006219:Halogens; D006801:Humans; D008027:Light; D008689:Methacrylates / Q000528:radiation effects; D011108:Polymers; D012833:Siloxanes / Q000528:radiation effects
chemical_list: D003188:Composite Resins; C466112:Esthet-X; C438835:Filtek P60 Composite Resin; C444701:Filtek Z250; D006219:Halogens; D008689:Methacrylates; D011108:Polymers; C477351:Prodigy Condensable; D012833:Siloxanes; C113049:Solitaire composite resin; C403464:SureFil packable composite; C479084:admira