Background: Although inflatable saline implants have been in use since 1965, few studies have examined their deflation rates over time.
Objective: We conducted a retrospective study to analyze the deflation rate for Mentor inflatable Siltex saline implants (Mentor Corp., Santa Barbara, CA) for a period of 5 years following implantation.
Methods: The study group included 645 Siltex inflatable implants placed in 324 patients for primary breast augmentation between 1992 and 1997. The implants were placed by a single surgeon using the same surgical technique. Implant data were obtained from the operative log and patient charts for a 6-year period from 1992 to 1997. All patients were followed for 5 years.
Results: The deflation rate of the implants was 0.3% within the first year of implantation, 2.2% within the first 3 years, and 5.3% over 5 years. The rate of spontaneous deflation per implant year was 0.3% at 1 year, 0.7% at 3 years, and 1.0% at 5 years. The deflation rate was lower than the expected deflation rate reported in the manufacturer's product insert data sheet.
Conclusions: The rate of spontaneous implant deflation per year was demonstrated to increase with time. Further studies are needed to ascertain the long-term deflation rates for each type of breast implant.