A natural component as coinitiator for unfilled dental resin composites

• Published in: Journal of biomedical materials research. Part B, Applied biomaterials Vol. 82B; no. 1; pp. 44 - 50
• Main Authors: Shi, Suqing, Nie, Jun
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.07.2007
• Subjects: 4-Aminobenzoic Acid - chemistry; 4-Aminobenzoic Acid - radiation effects; Composite Resins - chemistry; Composite Resins - radiation effects; composite/hard tissue; Dental Materials - chemistry; Dental Materials - radiation effects; Dioxoles - chemistry; Dioxoles - radiation effects; FTIR; Humans; Kinetics; Light; mechanical properties; Methacrylates - chemistry; Methacrylates - radiation effects; para-Aminobenzoates; Photochemistry; Polyethylene Glycols - chemistry; polymerization; Polymethacrylic Acids - chemistry; Polyurethanes - chemistry; Polyurethanes - radiation effects; Spectroscopy, Fourier Transform Infrared; Terpenes - chemistry; Terpenes - radiation effects; Water - chemistry
• ISSN: 1552-4973; 1552-4981
• DOI: 10.1002/jbm.b.30703

A natural component, 1,3‐benzodioxole (BDO), was used for the purpose of replacing the conventional amine for dental composite. Camphorquinone (CQ)/BDO was used to initiate the photopolymerization of urethane dimethacrylate (UDMA)/triethylene glycol dimethacrylate (TEGDMA) (70/30 wt %). The kinetics was recorded by real‐time Fourier transformation infrared spectroscopy (FTIR). The mechanical properties were measured by dynamic mechanical analyzer (DMA), and CQ/ethyl 4‐N,N‐dimethylaminobenzoate (EDMAB) mixture was used as control in the same photocuring condition. The results indicated that, the addition of BDO as coinitiator greatly improved the rate of polymerization and final double bond conversion (DC), when compared with the system initiated by CQ alone. BDO and EDMAB were found to reach almost the same final DC (75%), though the kinetics of two systems was different. Comparing with EDMAB, BDO brought approximately the same glass transition temperature (Tg), but slightly higher storage modulus around 37°C. The water sorption and solubility for two mixtures were almost the same and within the range of the ISO 4049's standards. These results suggested that BDO was an effective alternative to conventional amine for coinitiator. And the human diet characteristics of BDO made it more promising than amine in the dental resin formulations. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007