Meet our Team of Caring Professionals

Staff of Great River Endodonitcs


Dr. Dennis M. Tucker, D.D.S.

Dr. Tucker

Dr. Dennis Tucker is a board certified endodontist. He received his DDS degree from Emory University in 1988. His undergraduate degree in Animal Physiology was completed at the University of California in 1984. Dr. Tucker completed a hospital-based internship at the National Naval Medical Center in Bethesda, Maryland. His residency in the specialty of endodontics was completed at the University of Illinois, Chicago. Dr. Tucker became a Diplomate of the American Board of Endodontics in 2000. He is a member of the American Dental Association, American Association of Endodontists, Minnesota Dental Association, Minnesota Association of Endodontists, College of Diplomates of the American Board of Endodontics, Minneapolis District Dental Society, and Northside and St. Cloud Dental Study Clubs. In his spare time, Dr. Tucker enjoys scuba diving, snow skiing, and bicycling.

Dr. Thomas A. Karn, D.M.D., M.S.

Dr. Karn

Dr. Thomas Karn is a native of the Upper Peninsula of Michigan and graduated from The University of Michigan with a BS in Aerospace Engineering in 1989. Shortly thereafter he was commissioned as an officer in the US Navy and spent the next seven years in the nuclear submarine force. Dr. Karn received his DMD degree from the University of Connecticut School of Dental Medicine in 2000 and his endodontic specialty certificate/Master of Dental Science degree in 2003. Following a private practice associateship in Connecticut, he and his wife Eileen decided to relocate back to the Midwest and now reside in Plymouth with their three children.

Dr. Karn is a member of the American Dental Association, the Minnesota Dental Association, the American Association of Endodontists and the Minnesota Association of Endodontists. He enjoys downhill skiing, a variety of outdoor activities, home renovation, and spending time with his family.

Dr. Christopher M. Beus, D.M.D., M.S.

Dr. Christopher M. BeusDr. Beus completed his undergraduate education at BYU majoring in Neuroscience. He went on to receive his DMD degree from Harvard University in 2007. Upon completion of his doctoral training, he joined a private dental practice in Boston and was a pre-clinical instructor for the Harvard School of Dental Medicine. Dr. Beus received his endodontic certificate at the University of Connecticut School of Dental Medicine.

Chris, his wife Darcy, and their two sons are excited to come to Minnesota to be near family and friends. In his spare time he enjoys being outdoors, traveling and spending time with his family.

Dr. Beus is a member of the American Dental Association, the American Association of Endodontists, the Minnesota Dental Association and the Minnesota Association of Endodontists.

Dr. Nathan R. Lund, D.D.S.

Dr. Nathan LundDr. Lund grew up in Duluth and earned a BA in biology from Gustavus Adolphus College in 2005. He graduated from the University of Minnesota School of Dentistry in 2008. Following graduation, Dr. Lund volunteered and served in US Army Special Operations deploying to Afghanistan with Special Forces in 2009. His awards include the Soldiers Medal for heroism, Joint commendation medal, as well as multiple Army Commendation Medals. He graduated from Endodontics Residency in 2011 and worked as an Endodontist both for the Army and in private practice in Georgia. Dr. Lund achieved Endodontic Board Certification in 2012. Dr. Lund and his wife Christine live with their two children in Rice MN.

Dr. Lund is a Diplomate of the American board of Endodontics, member of the College of Diplomates, and a member of the American Association of Endodontists. He is also a member of the American Dental Association. Dr. Lund was peer nominated and inducted into the Pierre Fouchard honorary dental society in 2013.

Dr. Rhett C. Finley, D.D.S.

Dr. Rhett C. FinleyDr. Finley grew up in Rapid City, SD and completed his undergraduate studies at Baylor University majoring in Biology, with a minor in Chemistry. Following college, he entered Dental School at the University of Minnesota and earned his D.D.S. degree in 2010. He then completed a one-year General Practice Residency at the University of Colorado Denver. Dr. Finley moved back to the Twin Cities and practiced General Dentistry for three years before pursuing two years of specialty training in Endodontics. He received his Masters of Science and Certificate in Endodontics from the University of Minnesota.

Rhett, his wife Julianne, and their daughter Lucy love everything that Minnesota has to offer and are excited to a part of the central Minnesota community. In his spare time Rhett enjoys outdoor activities including golfing, cycling and x-country skiing.

Dr. Finley is a member of the American Association of Endodontists (AAE), the Minnesota Association of Endodontists (MAE).

What is an Endodontist?

An endodontist is a licensed dentist that has completed two or more years of advanced post-doctoral residency training in the specialty of endodontics. All dentists are trained to provide endodontic treatment, but many will refer their patients to endodontists.

Endodontists provide only endodontic services because they are specialists. They perform routine as well as difficult and complex endodontic procedures including re-treatments and surgical treatments. Endodontists are also experienced in finding the cause of oral and facial pain that is difficult to diagnose.

More Frequently Asked Questions