Unparalleled Support

What sets OU's advanced dentistry residency program apart from other programs is its strong clinical component, coupled with the support of an outstanding faculty to help guide and educate our residents. The residents have the advantage of working in our clinic with faculty, which hold specialties in Endodontics, Prosthodontics, Periodontics, Oral Maxillofacial Surgery and Oral Pathology. Our goal is to develop a clinician that has a strong background in restorative dentistry to better serve their future dental needs of their patients. 

Program Director, Phoebe Vaughan, DDS

Dr. Vaughn is a native to Oklahoma City and earned her undergraduate degree in biology and music from the University of Central Oklahoma. She graduated with her Doctor of Dental Surgery degree from the University of Oklahoma College of Dentistry and completed the Advanced Education in General Dentistry residency, also at OUCOD. Following graduation, she joined Dr. Shannon Griffin in private practice. Their practice was committed to the same type of high quality, comprehensive dentistry taught and practiced in the AEGD program. In addition, she joined the faculty of the OUCOD in the Department of Operative Dentistry as a part-time Clinical Instructor. Over time, she began teaching in AEGD and accepted the role of Assistant Director, and eventually earning the role of Director. Serving the community through dentistry is her passion. She is active in several dental and statewide activities that target those with unmet dental needs. Because of her commitment to the dental profession, education, and service, she received the OUCOD Young Alumnus of the Year Award and was given the OUCOD Outstanding Part-Time Faculty Award. She is a board member and volunteer dentist with D-DENT, a charity that provides free dental care to low-income elderly and disabled Oklahomans. She has served in many capacities with several dental volunteer organizations, including the Oklahoma Mission of Mercy, and was most recently the Restorative Lead at that event. She is a Fellow of the prestigious Pierre Fauchard Academy.

Assistant Director, Shannon L. Griffin, DMD

A native New Mexican, Dr. Griffin graduated from Tufts University School of Dental Medicine in 1996. She came to Oklahoma to be a resident in the AEGD program and after completion of the program, stayed for an additional year, earning a Certificate in Advanced Comprehensive Dentistry. It was during her two years of residency that the AEGD program implemented a surgical implant protocol. Upon completion of the program, she opened a private practice in Edmond, Oklahoma. At the same time, she accepted a position at the OUCOD as a clinical instructor in Oral Diagnosis, Restorative Dentistry and AEGD. She is a CEREC certified trainer and continues to guest lecture at Tufts. She has volunteered in the community by serving the Oklahoma City Zoo. She is an active member of the Oklahoma County Dental Association, having served as a Board Member multiple times. Dr. Griffin has served the Oklahoma Mission of Mercy since 2010 and has been a Lead Dentist in the Restorative section from 2011-2015 and served as the State Chairman of OKMOM in 2016. She has given many continuing education presentations throughout the local community. Her private practice experience, coupled with her background in AEGD and clinical teaching experience, offers a great value to the AEGD program at OU. Dr. Griffin is a Fellow of the esteemed Pierre Fauchard Academy and the American College of Dentists. She has received the ODA Presidential Leadership Award and the OUCOD Outstanding Part-Time Faculty Award. She is currently serving as the Vice President of the Oklahoma Dental Association.


Taylor Barton, DDS

Dr. Barton is a graduate of the OU AEGD program. He is a distinguished graduate of the OUCOD and his year in AEGD exemplified why he came to our program with the highest of recommendations. Prior to attending dental school, Dr. Barton received a Masters of Arts in Dietetics and was trained and worked as a dental laboratory technician. He is in private Practice with Dr. Shannon Griffin in Edmond, Oklahoma. 


Lars Bouma, DDS

Dr. Bouma is a Diplomat with the American Board of Prosthodontists. He has been in private practice in Oklahoma City since 2006, and prior to that, he spent 11 years in the United States Air Force with stops at Lackland Air Force Base in San Antonio, Texas, and Offutt Air Force Base in Omaha, Nebraska. During his time in the Air Force, Dr. Bouma served as Chief of Prosthodontics, Dental Laboratory Flight Commander, and Assistant Director for the AEGD Residency. He separated from the United States Air Force as a Lieutenant Colonel, and has since been in private practice in Oklahoma City. His knowledge of all areas of dentistry, especially the surgical aspects, greatly bolsters the educational and clinical components of OU AEGD.


Mike Fling, DDS

Michael C. Fling, DDS, began his career in dentistry in 1976 as a laboratory technician. He soon discovered a passion for dentistry and entered dental school. He graduated from the OUCOD in 1984 and went into private practice in Oklahoma City. His private practice focuses on restorative and cosmetic dentistry, as well as TMJ treatment. In 1988, only four short years after entering the profession, he received the Young Dentist of the Year Award from the Oklahoma Dental Association. As a renowned clinical instructor and guest lecturer, he is consistently on the leading edge of dentistry, and incorporates the latest in dental innovation, technology and techniques into his practice. Aside from his faculty appointment at OU, he also serves as Associate Faculty at the L.D. Pankey Institute. Dr. Fling recently completed the process to be awarded the title of “Pankey Scholar.” As a member of the American Academy of Restorative Dentistry, the American Academy of Fixed Prosthodontics, and the American College of Dentists, he has lectured throughout the country to dental and laboratory associations and to various study groups on fundamental principles of restorative dentistry and achieving technical excellence. 


Barry Greenley, DDS

Dr. Greenley is a distinguished Diplomat of the Federal Services of General Dentistry. He attended the University of Missouri at Kansas City School of Dentistry while on active duty in the U.S. Air Force. Upon graduation in 1978, he completed a one year General Practice Residency at Malcolm Grow USAF Medical Center, Andrews AFB, Maryland. In 1987, he completed a two-year AEGD program in Keesler AFB, Mississippi. After serving our country for a full military career, Dr. Greenley was recruited to Oklahoma in 1995, where he joined the OU AEGD program. He previously served as the Assistant Director of AEGD and has most recently been serving as a general Practice Director for the College of Dentistry. We are very fortunate to have Dr. Greenley in our clinic as a part-time faculty and lecturer as he is an avid clinician with extensive knowledge and experience in fixed prosthodontics, removable prosthodontics, dental materials, and esthetic dentistry.


Mary Hamburg, DDS, MS

Dr. Mary Hamburg was born in North Dakota and moved to Perry, Oklahoma, with her family at a young age. After high school, she attended the University of Oklahoma and obtained her bachelor’s degree in Zoology. She received her dental degree, along with her periodontal and implant specialty training, at the OUCOD. Dr. Hamburg is a Diplomat of the American Board of Periodontology. She is also an executive board member to the Oklahoma Association of Women Dentists, a member of a Spear Study Club, and has presented several continuing education courses for dental practitioners in Oklahoma. 


Drew Hendrix, DDS

Dr. Hendrix graduated with his Doctor of Dental Surgery degree, along with his AEGD degree, at the OUCOD. He has a strong clinical background and is passionate about providing the best care for patients and staying current with dental techniques. He owns a private practice clinic in Kingfisher, Oklahoma. In addition to his practice, he is active in his community as the Director of the Kingfisher County Health Department. 


German Luezas, DDS, MS

Dr. Luezas completed his endodontic training with a Masters of Dental Science Degree at the University of Connecticut after finishing dental school and a two-year residency in AEGD. Prior to attending residency, he practiced as a general dentist, where he was able to find his passion for performing root canals. Now as an endodontist, he has expertise in working with specialists and general dentists. Dr. Luezas enjoys the opportunity to be able to give back to the community by participating with Mission of Mercy and working with special needs patients. Dr. Luezas is a member of the American Association of Endodontics, the American Dental Association and the Oklahoma Dental Association.


Michael McKinney, DMD, MD

Dr. Michael McKinney was born in Tulsa. He graduated from State University of New York at Buffalo, where he earned his DMD degree, Certificate of Residency in Surgery, and Certificate in Oral and Maxillofacial Surgery. He returned to Oklahoma to complete a Fellowship in Pediatric Cleft and Craniofacial Surgery at the OUCOD. Currently, he works at his private practice in Edmond, Oklahoma. He has a passion for serving people and he volunteers frequently in local and international clinics. He is a member of the American Association of Oral & Maxillofacial Surgeons, American Dental Association, Oklahoma Dental Association, Oklahoma Society of Oral & Maxillofacial Surgeons, and Oklahoma County Dental Society.


Paul Mullasseril, DDS, MS

Dr. Paul Mullasseril completed his residency in Prosthodontics at the University of Oklahoma in 1994. He then completed a Fellowship in Maxillofacial Prosthetics at M.D. Anderson Cancer Center in 1996. That led to his return to the department of Removable Prosthetics at the OUCOD, where he was appointed and served as Director of Maxillofacial Prosthetics until 2008. From 2008 until 2011, he taught at Eastern Washington University. He returned to the OUCOD in July 2011, when he was appointed Chair of Restorative Dentistry. Twice, in 2000 and 2014, he was awarded the Outstanding Full-Time Faculty Award from the Student Council, OUHSC. He is also a recognized national lecture, having been a consultant and key opinion leader for 3M, conducting CE courses for them nationally and internationally. Since 2011, he has been a consultant for Park Dental Research and science. His expertise enable our residents to better understand the importance of sound treatment planning in fixed and removable prosthodontics. He also teaches the significance of proper case selection and design for restoring a variety of implant supported restorations. 


Mark Phan, DDS

Dr. Phan was born in Vietnam and relocated to the United States at a young age, now calling Oklahoma City his home. Dr. Phan graduated from the OUCOD and completed the additional year of AEGD. After finishing his residency, he became a faculty member at the OUCOD while also entering into private practice. Dr. Phan volunteers his time and skills on mission trips around the world to help treat families in need. He also has a heart for third-world countries and is committed to lending a helping hand every year. 



The additional specialists who work with our residents are a combination of faculty from OUCOD as well as experienced clinicians from the local community.  Together, we formulate a program that offers our residents one-on-one attention which helps them build their confidence in their clinical skills.

The support staff is essential in helping our residents transition into a private practice-like setting. Each AEGD resident will work a chairside dental assistant throughout the program. Working with the assistants allows the resident to provide quality care efficiently in a setting that better reflects the true working environment of dentists in private practice. 

The program also employs a business team that handles appointments, billing, insurance, and other managerial tasks. Interaction with a working business office gives the residents experience in practice management.

The AEGD resident will complete the normal laboratory work that a private dentist might do: trimming dies, pouring impressions mounting cases and learning to discuss their cases with the technician. The resident will have the ability to work with a variety of dental laboratories to better understand the value of quality restorations and the expertise and strengths of each technician.