Administrative Services Only, Inc (ASO) is a third party administrator of benefits specializing in the multi-employer trust fund plans. Established in 1970 as Self-Insured Dental Services (SIDS) when we exclusively worked with dental plans, we expanded our services to include full Fund administration services as well as processing claims for various supplemental benefits. We also offer a consumer Dental Discount Plan under the name Metrodent, which can be accessed via metrodentusa.com.