title: Dual-porosity expanded polytetrafluoroethylene soft tissue implant: a new implant for facial soft tissue augmentation.
abstract: OBJECTIVE
  To illustrate problems observed with low-porosity expanded polytetrafluoroethylene soft tissue implants and to describe a new dual-porosity implant, the technique for insertion, and this author's preliminary experience.
  
  
  METHODS
  A review of 175 pieces of SoftForm (Collagen Corporation, Palo Alto, Calif) placed in 69 patients over 3 years was performed. Between October 1, 1997, and September 30, 2000, 106 Advanta implants (Atrium Medical Corporation, Hudson, NH) in 42 patients have been carried out. A new instrument for implant insertion and the procedure used is described herein.
  
  
  RESULTS
  The low-porosity expanded polytetrafluoroethylene implants demonstrated a significant amount of problems with shrinkage and migration.
  
  
  CONCLUSIONS
  Preliminarily, the dual-porosity implants would appear to offer a lower incidence of these complications. They are subjectively softer to feel once in place. Insertion is quick and easy using the method described herein.
authors.affiliation: The Aesthetic Laser and Cosmetic Surgery Center, 61 Locust St, Suite 2, Northampton, MA 01060, USA. ursamj@crocker.com
authors.forename: William H
authors.initials: WH
authors.lastname: Truswell
mesh_terms: D005145:Face / Q000601:surgery*; D006801:Humans; D019060:Minimally Invasive Surgical Procedures; D011138:Polytetrafluoroethylene; D019736:Prostheses and Implants; D011475:Prosthesis Failure; D015361:Rhytidoplasty / Q000295:instrumentation / Q000379:methods*
chemical_list: D011138:Polytetrafluoroethylene