Semirapid maxillary expansion (SRME) was introduced with the hypothesis that may result in reduction of relapse in post-retention period. The long term effects of SRME on the dentoskeletal structures will be presented in this presentation. A rigid acrylic maxillary expander was used for SRME (rapid maxillary expansion of 5-7 days, followed by slow maxillary expansion) in older adolescents and adult cases. The mean expansion time was 0.34 years and the mean follow-up period after retention was 5.6 years. Zygomatic, lower nasal, maxillary base and maxillary intermolar widths were stable at the end of follow-up stage.