At Ponderosa Dental Group in Rancho Cucamonga, CA, our team of skilled dental professionals is committed to providing exceptional care for patients of all ages. With expertise across various specialties, our dentists and specialists work together to ensure your experience is both comfortable and rewarding. Meet the dedicated doctors behind your healthiest, happiest smile.
Dr. Barouir Deirmenjian
Dr. Barouir Deirmenjian is a general dentist dedicated to providing compassionate, high-quality care for patients of all ages. As the founder and CEO of B. Deirmenjian and Affiliates, he oversees multi-specialty facilities across California, including locations in Los Angeles, San Gabriel Valley, Riverside, and San Bernardino counties, with recent expansions into San Diego.
Dr. Deirmenjian earned his Bachelor of Science degree from the University of California at Irvine in 1988 and completed his Doctor of Dental Surgery (DDS) degree at the University of the Pacific Arthur A. Dugoni School of Dentistry in 1999. He is board-certified by the Dental Board of California and an active member of the American Dental Association and California Dental Association.
At Ponderosa Dental Group in Rancho Cucamonga, CA, Dr. Deirmenjian focuses on creating a welcoming environment where patients receive advanced, personalized care.
Fluent in English, Armenian, Spanish, and French, he enjoys the outdoors and contributing to community initiatives, including food drives and pro bono work for underserved populations.
Dr. Jack I Ching Lee
Dr. Jack I Ching Lee is a general dentist at Ponderosa Dental Group who is passionate about creating healthy, beautiful smiles. He earned his DDS degree from Northwestern University in 2001 and completed a general practice residency at Cedars-Sinai Hospital, where he honed his clinical skills.
Dr. Lee values the opportunity to work with a friendly team and connect with patients from diverse backgrounds. His hands-on approach and dedication to improving oral health make him a trusted provider for the Rancho Cucamonga, CA, community.
Outside of dentistry, Dr. Lee enjoys fishing, cooking for friends and family, and playing video games.
Dr. Shahram (David) Mashhadian
Dr. Shahram (David) Mashhadian specializes in oral and maxillofacial surgery at Ponderosa Dental Group. He holds dual degrees, earning his MD from Mount Sinai School of Medicine and his DDS from New York University College of Dentistry. Dr. Mashhadian is a:
- Fellow, American College of Surgeons
- Member, American Academy of Cosmetic Surgery
- Member, American Association of Oral & Maxillo-Facial Surgeons
Dedicated to enhancing patient outcomes, he combines surgical expertise with compassionate care. Dr. Mashhadian also volunteers with programs like Smile Generation Day and Thousand Smile to give back to the community.
Dr. Michael Vongphoe
Dr. Michael Vongphoe is an endodontist at Ponderosa Dental Group known for his transparent communication and patient-focused care. He earned his DDS degree from the University of Southern California and is a member of the:
- American Dental Association
- California Dental Association
- American Association of Endodontists
At the Rancho Cucamonga, CA, office, Dr. Vongphoe takes pride in delivering discomfort-free care while addressing complex dental issues.
In his free time, he enjoys traveling and spending time with his family.
Dr. Kevin S. Lee
Dr. Kevin S. Lee specializes in orthodontics and craniofacial development. He earned his DDS and MS in oral biology from UCLA and is certified by the American Board of Orthodontics. Dr. Lee’s passion for orthodontics stems from his fascination with human craniofacial growth and development.
At Ponderosa Dental Group in Rancho Cucamonga, CA, Dr. Lee is dedicated to helping patients achieve straight, healthy smiles through personalized orthodontic care.
When not working, he enjoys soccer, traveling, and driving sports cars.
Dr. Shebli Mehrazarin
Dr. Shebli Mehrazarin is a board-certified periodontist and implant specialist dedicated to preserving oral health and restoring confident smiles. Born in Berlin and raised in Orange County, California, Dr. Mehrazarin pursued his entire academic journey at UCLA, earning a bachelor’s degree in biochemistry, a doctorate in dental surgery (DDS), and a PhD in oral biology. He went on to complete his advanced specialty training at Columbia University, where he earned both his residency certificate and a master’s degree in periodontics and implant dentistry.
With a deep passion for hands-on work and patient-centered care, Dr. Mehrazarin stays at the forefront of his field through continuing education. He has completed advanced training in full arch implant restoration, sinus grafting, guided bone regeneration, LANAP, and oral plastic surgery techniques. His professional affiliations include the American Academy of Periodontology, the Academy of Osseointegration, and the American Dental Association. Since joining our practice in 2024, he has been committed to helping patients understand their treatment options, save their natural teeth, and achieve long-term oral health.
Dr. Mehrazarin finds joy in building relationships with his patients and empowering them through education. He values the welcoming environment of the practice, where both the team and patients make every day meaningful. Outside of work, he enjoys traveling, swimming, and cooking with his wife, Saman, and their son, Mahyar.
Dr. Robert Lew
Dr. Robert Lew is an experienced and compassionate associate dentist who has been proudly serving our patients since August 2024. A graduate of Tufts Dental School in 1992, Dr. Lew completed a General Practice Residency at Hackensack Medical Center from 1992–1993. His inspiration to pursue dentistry came from his aunt, whose impact on patients’ lives left a lasting impression on him at a young age. Today, what drives him is that same purpose—helping people feel better, smile with confidence, and enjoy eating again. For Dr. Lew, the most rewarding part of dentistry is hearing patients express their gratitude and knowing he’s made a real difference in their lives.
Dr. Lew was born and raised in Brooklyn, New York, and brings his friendly, down-to-earth nature into every patient interaction. He values the meaningful conversations he shares with patients—whether about sports, food, travel, or life experiences—and believes those connections make each day unique. Since joining our practice, he’s found a true sense of community, surrounded by a supportive, skilled team and some of the kindest patients he’s ever worked with. Outside the office, Dr. Lew is a proud movie and music enthusiast, passionate foodie (willing to travel hours for a great meal), and avid sports fan. He’s traveled to over 15 countries and currently enjoys nothing more than spending time with his son, who brings him the greatest joy.
