Dentist Framingham | Orris Dental | About Us
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Ali Maddahi, MS, DMD

General Dentist

Dr. Maddahi received his Master of Science in Microbiology in 1986. He completed his dental education at Tufts University School of Dental Medicine, graduating with a DMD degree in 1990. In recognition of his academic record and clinical skills while at Tufts dental school, he was elected to participate in an implant program to restore implants and was elected to be a member of the Andrew Bates Dental Research Society. After his graduation he attended a postdoctoral research fellowship in medicine at Harvard School of Medicine in 1992.

Dr. Maddahi has over 30 years of clinical experience and more than 20 years of teaching and research in the field of dentistry. He holds a part-time position as a General Dentist at the Cambridge Health Alliance Dental Clinic’s General Dentistry Residency program and is a part-time faculty member at the Harvard School of Dental Medicine, Department of Oral Health Policy and Epidemiology.

Dr. Maddahi believes that it is important to keep current with evolving techniques and materials, and therefore completes many hours of continuing education courses and research every year. These include gum treatments, oral surgeries, dental implants, dental crowns, root canal therapy and removable dentures, as well as cosmetic ceramic and veneer restorations to provide the most advanced techniques and treatment options for his patients.

Dr. Maddahi is a respected member of the dental community, holding memberships in the American Dental Association and the Massachusetts Dental Society.

Dr. Maddahi and his wife, Jilla, (our office manager) established Orris Dental in 2010. Dr. Maddahi loves dentistry, his excellent staff, and our wonderful patients. He also enjoys reading and nature.


Caleb Tam, MS, DDS

General Dentist

Dr. Caleb Tam was born and raised in the Bay Area, California. He earned his BS in biology (2009) from the University of California, Davis, and his MS in biomedical engineering (2013) and DDS (2018) from the University of California, San Francisco (UCSF). During his time at UCSF, he received 4 Clinical and Research Excellence Day awards and has been presented with scholarships from the American Dental Association (ADA) Foundation, International/American Association for Dental Research (IADR/AADR), Colgate, Pierre Fauchard Academy, Academy of Osseointegration, and Academy of Dental Materials.

After graduating from dental school, Dr. Tam completed a General Practice Residency through Harvard School of Dental Medicine/Cambridge Health Alliance (2019), where he has since remained on board and currently serves as Program Director. His primary academic/research interests include dental biomaterials, dental regenerative therapies, and the “Oral Physician” training model.

Dr. Tam also has a passion for outreach and education as he enjoys volunteering in his local community as well as serving as a mentor for future generations of dental professionals. He is currently involved with efforts such as the Healthy Smiles Project (Cambridge Health Alliance), African Community Health Initiatives (Boston), and Biomedical Careers Science Program (Harvard Medical School). 


Pooyan Refahi, DMD, MS

Periodontist & Implantologist

Dr. Refahi is a board-certified Periodontist and Implantologist accredited by the American Board of Periodontology and Dental Implantology. He obtained his Bachelor of Science in Biology from George Mason University and his Master of Science in Biomedical Science Policy & Advocacy from Georgetown University. He then pursued a career in dentistry by acquiring his Doctor of Dental Medicine from Tufts University School of Dental Medicine. Upon graduation, he remained at Tufts for an additional three years and received his specialty certificate in Periodontology and Implantology.

Dr. Refahi has kept strong ties with Tufts University School of Dental Medicine as adjunct faculty and continues to work on research projects in the field of Periodontics and Implant dentistry. He has also lectured at Yankee Dental Congress and continues to lecture at local study clubs. His training in complex interdisciplinary cases has provided a solid foundation and understanding of the need for collaborative and restorative dentistry for the best patient centered outcome.

Dr. Refahi has also completed his training in IV sedation to provide the best possible care for his patients undergo periodontal procedures in a relaxed and comfortable setting regardless of dental anxiety. He has also received his certification in LANAP, a laser-based treatment for gum disease, which is the only surgical laser gum disease treatment that is FDA-cleared and supported with histological studies and clinical results.


Donavon K Aroni, DMD, MS

Face Pain, TMJ & Sleep Disorder

Dr. Aroni is a general dentist with postgraduate education on Craniofacial Pain at Tufts University School of Dental Medicine (2011-2014). Dr. Aroni achieved his Master of Science in Dental Research with focuses on muscle activity, pain, and EMG. He also obtained his certificate on oral and maxillofacial radiology from University of Texas Health Science Center at San Antonio.

Dr. Aroni serves as an assistant professor in Department of Diagnostic Sciences, Craniofacial Pain Division, where he teaches undergraduate dental students and postgraduate dental residents. He also teaches at local and international orofacial pain and headache symposiums.

Dr. Aroni treats patients with facial pain, temporomandibular disorders, and sleep apnea (sleep disruption). His clinical research interests include facial pain and related headaches, fixed and removable oral orthotic devices, temporomandibular joint disease, and obstructive sleep apnea.

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