| 摘要 |
A dental retraction cord (or tape) for placement between a tooth and its adjacent gum tissue during dental impression taking and restorative procedures includes a thermoplastic material such as polytetrafluoroethylene (i.e. PTFE or Teflon) so that the cord is resistant to shredding, tearing, and sticking to dental restorative and impression taking materials. Additionally, chemical treatment of the cord may be avoided so as to reduce the risk of harmful side effects in chemically sensitive patients.
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