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Study of UV-curable composite resin of transfer
tray for orthodontics |
| YANG Lin1, NIE Jun1, WU Wei2, JIA Pei-zeng2, XU Bao-hua3 |
| 1.State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology; 2.Department of Orthodontics, School of Stomatology, Peking University; 3.China-Japan Friendship Hospital |
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Abstract Objectives: the aim of this study was to investigate the properties of UV-curable composite resin of transfer tray for indirect bonding system of the lingual brackets. Methods: the conversion of double-bond in the different concentration of UV-initiator was monitored by real time infrared (RTIR). The three-point flexure strength was measured by a universal testing machine. The storage modulus, loss modulus, and loss factor (tan delta) of the resin were measured by a Dynamic Mechanical Analyzer. The cytotoxicity of composite resin was evaluated by the agar covering test. Results: the double bond conversion exceeded 70% at [benzophenone] = 0.7 wt.%, [Ethyl 4-dimethylaminobenzoate] = 0.7 wt.% and [2-Hydroxy-2-methyl-1-phenyl propanon] = 1 wt.%. The mean value of flexural strength came to 122 MPa. The value of storage modulus was 1.04 × 109 MPa at 23°C. The glass transition temperature was 142°C. The toxicity grade was zero at 2 h and one at 24 h. Conclusions: in the preliminary evaluations, we indicated that the UV-curable composite resin of transfer tray could satisfy the clinical requirements.
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Issue Date: 05 December 2008
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