Our Doctors

Charles Riotto, D.M.D.

Dr. Charles Riotto received his undergraduate degree from the College of the Holy Cross in 1975, and his DMD degree in 1980 from the University or Pennsylvania, School of Dental Medicine. He has completed extensive additional training in comprehensive dentistry, including implant and advanced periodontal prosthetic rehabilitation. After serving for three years as a lieutenant in the US Navy Dental Corp, Dr. Riotto returned to his home state of Rhode Island and began practicing at Angell Street Dental Associates in 1983. Dr. Riotto continues to pursue continuing education with memberships in the Seattle Study Club, Providence Plantations District Dental Society and the American and Rhode Island Dental Associations.

For several years, Dr. Riotto has been recognized in the RI Monthly Magazine as one of “RI’s Top Dentists”.  He continues to donate his time and talents to people in need through the Rhode Island Donated Dental program. He has also delivered free dental care to children in need through the Christina’s Smile Mobile Childrens’ Dental Clinic and is an active participant in feeding the underserved and homeless through the Barrington Methodist Church chapter of Mobile Loaves and Fishes.

Dr. Riotto welcomes referrals to his practice from his existing patients, colleagues, and specialists, not only throughout New England, but throughout the United States. His treatment concepts will restore your teeth to both natural esthetics and function, while respecting your personal and financial considerations. By using the many treatment options, materials and techniques available today, Dr. Riotto is committed to providing you with the most appropriate treatment custom tailored to your particular needs.

Dr. Riotto resides in Barrington, RI with his wife, Mary Beth, of forty-two years where they enjoy golf and travel to keep up with their three children and expanding family.

Thomas DePetrillo, DMD

Dr. DePetrillo is a graduate of Bishop Hendricken High School. He later received a degree in chemistry from Eckerd College in St. Petersburg, Florida. He continued his studies at Tufts University in Boston, Massachusetts, earning a Doctorate of Medical Dentistry in 1989. Following many years of private practice in Johnston, RI, Dr. DePetrillo joined the Angel Street Dental Team in 2004.

Dr. DePetrillo is committed to providing his patients with the highest level of dental care. A lifelong learner, he has attended many renown advanced dental learning institutions across the country and studied with various experts in his field. He has had extensive training in advanced cosmetic procedures from both The Dawson Academy and The Clinical Mastery Series. He is skilled in all preventative, restorative, and cosmetic procedures and is a Preferred Provider with Invisalign.  Dr. DePetrillo is also a certified provider of Botox and Xeomin for esthetic procedures as well as for TMJ and migraine therapy. 

Dr. DePetrillo has been selected by his peers as a RI Monthly Magazine’s “ Top Doc ” for several years. He is a member the Providence Chapter of the Seattle Study Club. 

Dr. DePetrillo also donates his time to people in need through the RI Donated Dental Program and has provided free dental care to children through Christina’s Smile Children’s Dental Clinic. He also provides dental care for Veterans through a government assisted program.

Dr. DePetrillo lives in Glocester, RI with his wife, Cheryl, and daughters, Lauren, Julianna and Jenna. He spends most of his free time watching his daughter play competitive softball. One of his favorite vacation spots is Cabo San Lucas Mexico, where he enjoys tasting the local Tequila’s.

Christina Marie Barron, DMD, CAGS

Dr. Cristina Barron attained her Bachelors of Science Degree in Nutrition and Fitness with emphasis in Exercise Physiology at The Florida State University and went on to pursue a Biology Double Major at the University of South Florida. A graduate of the Goldman School of Dental Medicine at the Boston University, in 2005 she received the Delta Dental Award for her commitment to Public Health. Two years later she completed a post doctoral residency at the Lutheran Medical Center, earning an Advanced Education in General Dentistry certificate while providing dental care to the under-served population.

Over the past seven years, Dr. Barron has been committed to providing her patients with the highest quality of comprehensive dental care. She has been trained by several distinguished national lecturers, focusing on comprehensive dentistry including implant dentistry, advanced periodontal-prosthetics, Invisalign and root canal therapy. Her commitment is to provide minimally invasive dentistry with consideration to form and function. In her new patient consultation, she provides you with a full comprehensive work up with a clear diagnosis and treatment options. You will be educated with an opportunity to ask questions so that an informed decision can be made with regards to your oral health. We place a great emphasis on trying to keep you comfortable so that the best quality care can be delivered.

Dr. Barron has volunteered her time to Rhode Island’s Donated Dental Program and several other elementary schools in the New England areas, educating children and donating services. She is a member of the Seattle Study Club, Providence Plantations District Dental Society, Providence Dental Society, and the Rhode Island Dental Association, as well as American Dental Association. Additionally, she is a member of the Beta Gamma Chapter of the Zeta Tau Alpha Fraternity and is a supporter of the Suzan G. Komen Breast Cancer Foundation.