Meet The Team

Our Offices

You work hard every day to keep your family smiling and we want to be a part of that mission! As your local Philadelphia, PA orthodontists, our team is proud to offer comprehensive orthodontic services that are convenient, comfortable and cost-effective. Our goal is to help you and your family maintain a happy, healthy smile for years to come.

Evan Tran, DDS

Trapped in a young man’s body with a wise man’s brain, Dr. Evan Tran considers himself to be a great listener. To this end, Dr. Tran strives to understand his patients’ treatment goals and works with them to thoroughly explore how to achieve them. As a native Florida Gator, he chomped his way through The Big Apple for dental training at Columbia University. Not long after, he completed his orthodontic training at Seton Hill University in the small town of Greensburg, Pennsylvania. It was here, that he added the hobby of blacksmithing to his repertoire which also includes skiing, water sports, and computing. In 2016, Dr. Tran moved to Philadelphia to join Rich Orthodontics. He looks forward to meeting you and wants you to know that he will do his best to give you the smile you deserve!

Silke Cummings, DMD, MSD

Born in Kingston, Jamaica, Dr. Silke Cummings always felt she would pursue something in medicine as her mother was a doctor. However, after coming to the US for high school, she always happened to find herself hanging around in the dental clinic after her orthodontic appointments. When she finally got to experience a week-long dental summer program at the University of Pennsylvania, her heart became set on dentistry.

Dr. Cummings decided to attend UPenn where she majored in Biology and then continued there to receive her Doctor of Medicine in Dentistry degree. Although she found dental school very demanding, she received the Dean’s Scholarship all 4 years and graduated cum laude. She then went on to complete her orthodontics residency at the University of the Pacific in San Francisco. She is a member of the AAO (American Association of Orthodontists) and is an ABO board certified orthodontist. She is passionate about volunteer work, and especially enjoys interacting with the visitors at her local soup kitchen. In her free time, she enjoys jigsaw puzzles and being outdoors.
Silke Cummings, DMD, MSD

Sarah Prehn, DDS

Dr. Sarah Prehn is originally from Kingston, NY. Her mother worked as a dental assistant, and after shadowing her in high school at the office, she knew she wanted to be a dentist. Dr. Prehn completed her undergraduate degree at the State University of New York at New Paltz. She then went on to graduate with a Doctorate of Dental Surgery from New York University as the top woman in her class, and obtained her Orthodontic Certificate from Saint Barnabas Hospital in Bronx, NY. After residency, Dr. Prehn became a Diplomate of the American Board of Orthodontics. To further her dental knowledge, Dr. Prehn attends conferences and courses throughout the year. Her most recent coursework includes completing an advanced fellowship in clear aligner treatment. Dr. Prehn is also a member of the American Association of Orthodontics, Omicron Kappa Upsilon Dental Honors Society, the American Dental Association and the Pennsylvania Dental Association.

When asked why she chose orthodontics as her profession, Dr. Prehn said: “Practicing orthodontics allows me to help people in many ways. Some people seeking treatment are unhappy with the position of their teeth and want to straighten them for aesthetic purposes. For these patients, giving them the smile of their dreams gives them self-confidence. Other people are looking to correct more serious problems that affect eating, speaking and tasks that help them function in life. Whether their problem is mild or severe, it is so rewarding to see patients walking out of the office feeling happy about their treatment.”

Dr. Prehn now lives in Wynnewood, PA with her husband, Joseph and her kitten, Maisie. When she isn’t working, you can usually find her outside running. Her other favorite pastimes include going to musical concerts, traveling, reading and spending time with friends and family. Dr. Prehn is a singer and plays the trombone and piano. In addition to her work in the office, Dr. Prehn volunteers her time at local health fairs, performing dental screenings and teaching people about keeping their teeth healthy. She is also an active member in her church, getting to know her neighbors and giving back to the community.
Dr. Sarah Prehn

Michael Sanzari, DMD

Michael Sanzari, DMD graduated from the University of Dentistry and Medicine of New Jersey and completed a general practice residency program at St. Joseph’s Hospital, followed by orthodontics training at Columbia University. Dr. Sanzari has over 20 year of experience and is known as a perfectionist who takes a personal interest in every patient with a meticulous attention to detail. He specializes in Invisalign, traditional braces and removable orthodontic appliances. He is active in several industry organizations and enjoys straightening teeth and witnessing how it can change people’s lives and improve self-esteem.

When Dr. Sanzari was younger, he went through orthodontic treatment. He was so happy with the results that in high school he decided that he wanted to be an orthodontist. He wanted to be able to help other people as his orthodontist helped him. When asked what he finds to be the most rewarding aspect of his job, he replies, “I love seeing the transition in patients from being shy with low self-esteem to becoming outgoing, confident, happy patients. I also enjoy seeing multiple family members in treatment, including parents. You get to see families grow. It’s like we are all one big family.”
Dr. Michael Sanzari

Helmy Mostafa, DDS

Dr. Mostafa was born in Milwaukee, WI, where he completed his Advanced Education in General Dentistry (AEGD) residency at Marquette University. He then went to Boston university for his Doctorate, Doctor of Science in Dentistry. Afterwards, he went to Jacksonville University school of Orthodontics in FL where he completed his orthodontic residency.

Dr. Mostafa is a member of the American Association of Orthodontists, the American Dental Association among many others. Most notably he was bestowed the distinct honor of fellowship in the prestigious American College of Dentists and the Pierre Fauchard Academy. Both organizations select members of the highest ethical, moral and professional standards, and based on their exceptional contribution to organized dentistry, oral health care, dental research and education. To sum it up, Dr. Mostafa will go the extra miles for his patients smiles.

Dr. Mostafa enjoys hiking and watching waterfalls, snorkeling, skiing, skating, hunting, traveling and exploring new places, food and restaurants with his wife and 3 boys.
Helmy Mostafa Orthodontist
Rich Orthodontics
Philadelphia, PA
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