Previous reports concerning impacted teeth and supernumerary teeth have been reported but the majority of those reports were focused on the occurrence rate and position, tooth shape and other factors. A few investigators reported on the extraction time and the marsupialization time.
On this occasion, we experienced a case having mesiodens and an inverse impacted central incisor in the maxilla. We investigated this case from the point of view of extraction time and marsupiali-zation time.
1) After the observation period of 2 years,8 motnhs from the first visit, we extracted the supernumerary tooth and made a marsupialization of the impacted. tooth at 8.11 years. We started the traction treatment after a 3-month observation period.
2) The root formation of the supernumerary tooth was recognized as almost normal and the tooth could be moved to the appropriate position during a period of 1 year 8 months from the marsupialization. We, therefore, proceeded to the retention treatment.
3) The patient had no complaints during the past 1 year and 4 months and now she is placed on follow-up.