Practice overview
About the practice
Dental Specialties Northwest is a downtown Seattle practice focused on periodontics, dental implants and advanced restorative dentistry. Dr. Thomas Sweeney founded it in 1987. In October 2026 the practice moved from the Columbia Tower to 600 University St., Suite 800. Some photos on this page were taken at the previous office.
Dentists
Dr. Thomas Sweeney, DDS is the lead periodontist and implant specialist. He holds a BS in Genetics from UC Davis (1975), an MA in Biology from California State University, Chico (1977), an RDH from Foothill College (1979), a DDS from the University of Washington (1984) and a Certificate in Periodontics from the University of Washington (1986).
Dr. Rhys Spoor, DDS earned his DDS from the University of Washington in 1983 and served as an Affiliate Associate Professor at the UW School of Dentistry for 10 years. He is an Accredited Member of the American Academy of Cosmetic Dentistry and a Fellow of the Academy of General Dentistry, the International Dental Implant Society and the Pierre Fauchard Society. He lectures internationally and is an editorial reviewer for the Journal of Cosmetic Dentistry.
Treatments
- Gum disease treatment, including scaling and root planing and LANAP laser therapy
- Dental implants, including All-on-X full-arch treatment, with surgical placement and final restoration in one practice
- Gum grafting
- Full mouth reconstruction, crowns, dentures and hybrid dentures
- Cosmetic dentistry
- Expert second opinions
- Sedation: nitrous oxide, oral conscious sedation, in-office IV sedation, and general anaesthesia with an on-call anaesthesiologist
Insurance and payment
The practice is a Delta Dental Premier provider. For other plans it is out-of-network but verifies benefits and files claims. It does not accept Medicaid or Washington Apple Health. Payment options include cash, cheque, major credit cards, CareCredit, Proceed Financing and monthly financing, and the practice lists itself as an L&I provider.
Hours
Monday to Thursday, 7am to 4pm.