Magnet retained overdentures using the Astra dental implant system

The Astra Implant System (AIS) is a biologically sound and simple way of providing stability for the complete lower denture where anatomical changes have made retention, stability and comfort difficult to achieve. An ongoing clinical study has been undertaken where 20 patients have been provided with magnet retained overdentures using this implant system. This represented a total of 70 implants placed. Seven implants were removed from four patients (three at exposure, one infection). The remaining implants have been followed up for 12 to 25 months and are considered to have achieved successful osseointegration. All the patients in the study are successfully wearing a lower denture retained by magnets. The overall success rate for the implants placed is 90% but if implants less than 9 mm in length are excluded from the results then the success rate is 97.7%.