title: [Monitoring of methyl methacrylate monomer released from autopolymerized denture base polymers during processing using time-of-flight mass spectrometer].
abstract: OBJECTIVE
  To analyze the amount and tendency of methyl methacrylate (MMA) released from autopolymerized denture base polymer (self-curing resin) during processing using time-of-flight mass spectrometer (TOF-MS).
  
  
  METHODS
  Self-curing resin was mixed in the container using a ratio of 2 g of powder to 1 g of liquid in accordance with the manufacturer's instructions for 40 s as a specimen. The amount of MMA released from the specimen was continuously monitored and simultaneously recorded every minute by TOF-MS since immediately after mixing. A total of five specimens were monitored.
  
  
  RESULTS
  The amount of MMA increased dramatically at 11 min [(45.2 ± 3.5) mg/L] after mixing, and reached the highest level at 13 min [(228.9 ± 22.6) mg/L], then become stable at 23 min [(8.8 ± 2.3) mg/L] after mixing.
  
  
  CONCLUSIONS
  The releasing tendency of MMA could be analyzed accurately with continuously monitoring during processing. The amount of MMA released from self-curing resin changed rapidly and the processing was complicated and changeful.
authors: Department of Stomatology, The First Affiliated Hospital of Dalian Medical University, Dalian Liaoning 116011, China. mayujuan670506@163.com
authors: Yu-juan
authors: YJ
authors: Ma
authors: Hua-peng
authors: HP
authors: Cui
authors: Hai-yang
authors: HY
authors: Li