The Professional Dental team in Montreal - Prisma Dentists


A team dedicated to the well-being of patients

Our team is made up of dentistry and oral health specialists who share a desire to improve the smile and well-being of their patients.


Dr François Lechner

Dr. Lechner is the founder of PRISMA DENTISTES, and has more than 30 years of experience. Mastering all aspects of general dentistry, Dr. Lechner has expertise treating sleep disorders and in neuromuscular dentistry. He has developed a distinct vision of his profession through his research on the links between the temporomandibular joints, occlusion and posture, which he shares with the experts working alongside him. He is a graduate of l’Université de Montréal, and continuously learns by taking courses and attending conferences all over the world. Dr. Lechner is involved in various associations such as the Ordre des dentistes du Québec, Association des chirurgiens dentistes du Québec, American Academy for Sports Dentistry and American Academy of Dental Sleep Medicine.


Dr Jean Piché

He holds a DDS from l’Université de Montréal as well as North American (Canada and US) patents in implantology. He is the founder of Piché et associés dental centres and has a multidisciplinary practice specializing in orthodontics and implantology. He focuses on oral health and his patients’ comfort, as well as painless interventions. He is a founding member of the Club d’Étude des Généralistes en Orthopédie et Orthodontie (C.E.G.O.O), and is also a member of the International Association for Orthodontics and the American Academy of Cosmetic Dentistry. Dr. Piché holds a certificate in implantology from the Brånemark Institute and is a father of two boys. He enjoys sports and travel, and spends his free time skiing, playing golf and sailing.

Dr Steven Krychman

A seasoned periodontist, Dr. Steven Krychman has more than 20 years of experience in dentistry. In addition to being a key member of the Prisma team, this exceptional surgeon is the director of the periodontics department at the dental clinic in Montreal’s Jewish General Hospital. Holder of a DDS (Doctorate in Dental Surgery) from McGill University and a certificate in Periodontology from Tufts University in Boston, he is a member of the Association des parodontistes du Québec, Canadian Academy of Periodontists and American Academy of Periodontology. Always keen to keep his knowledge current, Dr. Krychman stays abreast of new developments that could improve his practice. He is empathetic and caring, and this noble-hearted man is involved in many ways in the Montreal Association for the Blind and the Mackay Center. When he is away from his patients, he can be found on a golf course where he plays with surgical precision.

Dre Hélène Buithieu

Dr. Buithieu is a Fellow of the Royal College of Dentists of Canada and has more than 20 years of experience in paediatric dentistry. She holds a Master’s degree in dental sciences, a certificate in paediatric dentistry and has taken several continuing education courses. She serves as an Associate Professor at the Faculty of Dental Medicine at the Université de Montréal, and is a proponent of pain-free dentistry. She leverages her knowledge, tact and warmth to educate children about dental health without preaching, a gentle approach that is appreciated by the young and old alike. This mother of three also loves tennis, running, cycling, telemarking and skiing.

Dre Lisa Sapatis

Dr. Lisa Sapatis graduated from McGill University in 1999 with a degree in dentistry and completed a multidisciplinary dental residency program at the Royal Victoria Hospital. For more than 15 years, she has maintained her commitment to providing patients with high quality, comprehensive and personalized dental care.

Her pursuit of excellence in dentistry includes continuing dental education at The Dawson Academy, a renowned institution, and the Spear Education Program. As a clinician, she values her patients and takes time to listen to them and inform them to accomplish their treatment goals through careful planning and execution. She is a member of the Montreal Dental Club, the Spear Study Club, and the International Team for Implantology (ITI).

Her three children helped her learn to perfect the art of multitasking! She enjoys traveling, skiing, dancing, and keeps fit through cross training. She is trilingual and can serve her patients in English, French and Greek. As a breast cancer survivor, she feels privileged to practice a profession for which she is passionate and she is enthusiastic to be part of Prisma’s dynamic team of dentists!

Dental Hygienists

Maryse Quévillon

Maryse is an expert in orthodontics, and always ensures her patients’ comfort. Maryse speaks French and English and enjoys running and volunteering to help seniors. She is an accomplished mom, and enjoys sharing dinner with friends.

Fatiha Ait-Amokhatar

Fatiha enjoys explaining treatment plans and ensuring that her patients know what to do to properly protect their teeth. She speaks French and Arabic, enjoys zumba, salsa and travelling into a good book…and in reality!

Abdoulaye Fofana

Abdoulaye is a graduate of Canadian and French dentistry schools. He is passionate about dentistry in all its diversity, and he dedicates himself to his patients to help them maintain a healthy mouth. Each patient is unique and Abdoulaye makes a point of finding solutions with each one to improve their oral health and well-being. When not at work, Abdoulaye likes to stay active and he loves hiking and jogging.

Lucila Guerra

Lucila, of Peruvian origin, studied dentistry at the Collège de Maisonneuve. She is always professional and in a good mood, and she cares deeply about her patients’ well-being. It is her pleasure to help you and advise you and your little ones during your dental appointment.



Anik Cartier – Executive Director

Anik is our Manager and Treasurer, and has been a part of the Prisma Dentistes team for more than 22 years. She has a daughter and prefers doing things with her family. She is an avid runner and skier and enjoys travelling and reading.

Peter Ortez – Administrative Director

There are about 15 people on the Prisma Dentistes team with more than 70 years of combined experience, speaking six languages and having handled thousands of appointments. The fact that most of them have been working with us for many years is something in which we take great pride.



Urgence sans rendez-vous tous les jours
514 739-0097