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Dr. Denis is a 1979 graduate of Loyola University School of Dentistry. Upon graduation he entered practice with his father and brother in the Chicago Lawn area. In 1993 he and his brother Dr. Raymond left the city and opened Bartz and Bartz Dental in Oak Lawn.

Dr. Denis is a member of the American Dental Association, Chicago Dental Society, Illinois State Dental Society, and Academy of General Dentistry. He is included in the Consumer Research Council Guide to America's Top Dentists. Dr. Denis has lectured to several groups in Illinois as well as Colorado and Wyoming. He currently lectures at Loyola University Medical Center where he is an Adjunct Instructor. He is a member of the Seattle Study Club, a National Organization that brings Dentists together who have committed themselves to excellence in their profession and are dedicated to the advancement of team treatment planning. He regularly attends courses and lectures on all facets of the dental field.

Dr. Denis has served on the board of several community organizations including the YMCA and Sertoma. He enjoys skiing, fishing and spending time with his wife and family

Dr. Alyssa Litkowski graduated from the University of Maryland Dental School. After graduation, she completed a General Practice Residency at Loyola Medical Center to gain experience in dental trauma, hospital and operating room dentistry, and implants. Dr. Alyssa treated a variety of patients including those with special needs and complex medical conditions. Dr. Denis Bartz was one of Dr. Alyssa’s mentors and attending faculty while completing her residency. 

She is a member of the American Dental Association, the Illinois State Dental Society and the Chicago Dental Society. Dr. Alyssa has traveled to Atima, Honduras to provide dental care for those in need and has volunteered in the community while at Maryland and Loyola to provide oral health care to those who are less fortunate. 

Dr. Alyssa enjoys reading, learning to cook and almost anything involving the water in her spare time. A native of Maryland, she’s getting used to life on the lake and is excited to continue exploring Chicago.


Our Team As a second-generation dental practice, our employee family includes our friendly, extensively trained, long-time staff members.

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