Meet The Doctors

Dr. Barouir Deirmenjian

General Dentist & Owner of B. Deirmenjian and Affiliates

As a general dentist, Dr. Deirmenjian is devoted to providing quality, rewarding, and compassionate care to every patient that visits him. Serving as the founder and CEO of B. Deirmenjian and Affiliates, he serves patients at many multi-specialty facilities in California, including Los Angeles, San Gabriel Valley, Riverside and San Bernardino counties and has just added three new locations in the San Diego area.

With nineteen locations in California, B. Deirmenjian and Affiliates serve patients of all ages, from all backgrounds, and from every walk of life. The team of specialists, general dentists, assistants, and benefit coordinators offer a number of services, including: cosmetic dentistry, dental implants, endodontics, family dentistry, oral surgery, orthodontics, pediatric dentistry, and periodontics. They are dedicated to making dental care rewarding, so that individuals have a reason to share their smile.

Before entering private practice, Dr. Deirmenjian served as Dental Director at Guards Dental, where he demonstrated strong leadership skills in operating over 40 locations. Subsequently, he established his own family dental private practices, Smiles West, Desert Dental Group, and Ponderosa Dental Group.

To prepare for his career, he completed his undergraduate studies at the University of California at Irvine, where he earned his Bachelor of Science degree in 1988. Furthering his studies, he went on to obtain his Doctor of Dental Surgery degree from the University of the Pacific Arthur A. Dugoni School of Dentistry in 1999.

Remaining abreast of the latest dental developments, Dr. Deirmenjian is an active member of the American Dental Association and the California Dental Association. He is also a peer-review member at MetLife Insurance and Liberty Dental, sits on the advisory committee of Henry Schein Dental, is a UCLA adjunct professor, and is board-certified by the Dental Board of California.

Revered for his extensive 30+ year leadership background, Dr. Deirmenjian has been voted #100 on the Inc.5000 Series list of the Fastest-Growing Companies in California and #1528 of the Inc. 5000 Fastest-Growing Companies nationally. He was also named one of LA Business of the Year, Best Office by Insurance Companies, and one of the Emerging Dental Groups to Watch 2020 by Group Dentistry Now.

Dentistry, also known as Dental and Oral Medicine, is a branch of medicine that consists of the study, diagnosis, prevention, and treatment of diseases, disorders, and conditions of the oral cavity. Dentists diagnose and treat dental issues and help patients develop better oral hygiene regimens. They clean teeth, correct bite issues, perform surgeries and extractions, and perform other duties to ensure that the teeth and mouth are healthy.

An active member of his community, Dr. Deirmenjian truly enjoys helping the less fortunate and volunteering when he can with food drives and community outreach initiatives. Previously, he has participated in pro bono work for human trafficking victims in the Los Angeles area. He was also involved in a health fair head-start program, senior citizens program, and maintained an affiliation with Veteran Affairs.

In his spare time, he enjoys the outdoors. He is fluent in English, Armenian, Spanish, and French.


Dr. ThuyDuong Truong


Dr. Truong received her Bachelor of Science in Chemistry from the University of Massachusetts with the highest honor Summa Cum Laude. After receiving her Doctor of Dental Medicine degree from Harvard School of Dental Medicine, she spent three more years as a postdoctoral fellow in orthodontics. She received her Certificate in Orthodontics from Harvard University. At the same time, she was also a research fellow at the Biotherapeutic Laboratory of the Harvard Institute of Human Genetics researching a cure and vaccine for breast cancer. She received a Master of Medical Science from Harvard University. She also received several awards and honors and was listed in Who’s Who Asian American in Massachusetts in 2001.

Dr. Truong has been practicing dentistry for over 25 years. She hopes to help you and your family improve your oral health and comfort and achieve balance and harmony between the teeth and the face. Her goal is not just to straighten your teeth but to perfect your beautiful and attractive smile. 

Besides dentistry, Dr. Truong enjoys cooking, sewing, knitting, gardening, painting, playing her “dan tranh”, a Vietnamese musical instrument, and coaching middle school students for the Science Olympiad competition. She lives happily in San Diego with her husband, a professor at UCSD, and their 3 sons.

Dr. VanHorne

Dr. Paul VanHorne

General Dentist

Dr. Paul VanHorne is not only a distinguished dentist at our practice, but also an individual deeply rooted in the essence of community and family. Born in Cleveland, OH, and raised in a suburb of Detroit, MI, Dr. VanHorne has always been driven by a blend of intellectual curiosity and a desire to make a positive impact on the lives of those around him.

Beginning his education at the University of Michigan, Dr. VanHorne not only completed his undergraduate studies there but also achieved his Doctor of Dental Surgery (DDS) from the same institution. His commitment to practical experience and further learning led him to a general practice residency at the USC School of Dentistry, ensuring a robust foundation in the field. With the belief that the dental profession continually evolves, Dr. VanHorne has participated in various continuing education courses. His endeavors to stay updated have seen him delve into areas like veneers, implantology, oral health, oral pathology, and the latest advances in dentistry, ensuring his practices are current and of the utmost quality. In a blend of professional and civic leadership, he served as the past president of the San Diego County Dental Society and took up a role as an officer of the Kiwanis Club of Tierrasanta. Dr. VanHorne also expresses his faith and community service as a Deacon at New Seasons Church of Spring Valley.

For Dr. VanHorne, the dental profession has been a perfect blend of using both hands and mind to help others. He enjoys educating patients, considering himself a teacher, and sharing knowledge that empowers them to better care for themselves. The positive, patient-focused environment of our practice, supported by a fantastic team, makes every working day an enjoyable one for him.

Outside of the office, Dr. VanHorne is deeply involved with family and community service. He has been happily married to his wife, Dolores, for 26 years, and together, the couple has 1 daughter, Jennifer, and 3 grandkids—Mia, Joie, and Isaac. His role as a grandfather and family man is closely knit with his community services through Kiwanis and his church.

His home is also enlivened by the presence of his pets—a lively black pug named Bucky, who is 3 years old; Marty, an 8-year-old mixed breed dog with a caring soul; and Amber, a 4-year-old domestic long-haired cat who is slowly coming out of her shell.

Through every smile he restores, every patient he educates, and every community activity he engages in, Dr. VanHorne continuously nurtures his passions and utilizes his expertise to create a positive impact wherever he goes.

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