Our Team

At Dr. Zak Downey Dental Care we provide family dental care that is affordable, gentle, and allows you to take care of most of your family’s oral health needs in the comfort of one convenient office. Yes that includes orthodontics as well.

The dental team at this office is extremely experienced and knowledgeable. On top of being specialists in family and orthodontic dentistry, at Dr. Zak Downey Dental Care, we also work with highly talented dental specialists in all other forms of oral health to make sure that your mouth is in its best possible shape.


The Zak Dental 360 Degree Quality Control Method:

We don’t just talk the talk…We walk the walk when it comes to Quality Assurance!!!

  1. Dr. Zak Downey Dental Care we have a Wellness Doctor on staff, whose purpose is to understand the unique oral health needs, objectives for yourself and your family; and whose objective is to get. You the best dental care available within a budget you can afford. Once your Wellness Doctor understands what procedures need to take place, he creates a customized treatment plan that is specifically for you. Based on the treatments needed, the Wellness Doctor will build a clinical team to execute the agreed upon plans.
  2. We want to make sure that your plan is accurate, and your diagnosis is spot on. That is why we always have more than one provider working on your treatment plan.
  3. We believe in a team-based approach because dental care requires a vast array of skills and abilities. In nearly thirty years of practice, Dr. Zak has never met a true “Master of All Trades” dentist. That is why we have paired up with a team of specialists that include: periodontists, endodontists, prosthodontists, oral surgeons, and orthodontists to support our general team.
  4. At the end of your treatment plan, our Wellness Doctor will step back in to check the quality of the completed work, ensuring that we provide you with our guaranteed 360-degree quality control system.

Dr. Zak Downey Dental Care has been serving the community since 1976


Meet Our Dental Staff

At Dr. Zak Downey Dental Care our expert team of dentists and administrative staff use modern state of the art equipment and are committed to helping you and your family’s visits productive, inexpensive and convenient.

Dr_Ilya_ZakDr. Ilya Zak, DDS

Dr. Ilya Zak attended USC Dental School for a six-year long undergraduate and graduate program titled ADAPT; he received his degree in 1990. He then became a resident at White Memorial Hospital, specializing in TMJ/Pain Management, and because of this specialization, he is a qualified medical examiner for TMJ dysfunction. He also was a part-time professor at his alma mater, USC Dental School, and has been practicing in Simi Valley, Valencia, Agoura Hills, Downey, and Long Beach since 1994. Dr. Zak takes great care in ensuring that patient care at Zak Dental is patient centric and enhances the wellness of our patients.

Dr. Roshi, DDS dentist our teamDr. Roshi, DDS

Dr. Roshanak Momen (Roshi) graduated in 2016 from Loma Linda University, School of Dentistry. She received an award for being a Teacher’s Assistant in Restorative Dentistry. She has her DDS degree from Azad University in 2009 as well. Dr. Roshi wanted to be a dentist from her childhood. She is committed to improving his patients’ health. Dr. Roshi speaks English and Farsi.

Dr. Nadia Abazarnia, dentist our teamDr. Nadia Abazarnia, DDS

Dr. Nadia graduated from Carlo Davila University of Bucharest in 1993.  Dr. Nadia has been practicing in California for over 14 years and is a recognized expert in dental implant restorations. Dr. Abazarnia is fluent in English, Farsi, and Romanian.  Dr. Nadia is an avid believer in the philosophy that dental treatment must enhance patients’ overall wellness and she practices this philosophy through her treatment of patients.

Dr. Olga Karnakova, DDS

Dr. Karnakova graduated from the Moscow Medical Dentist Institute in 1991.  In 2000 Dr. Karnakova passed the State of California Dental Board certification and has remained a doctor in good standing.  Dr. Karnakova continues  her dental career with Dr. Zak dental team as a full time dentist and as a part time instructor.  She is fluent in English and in Russian.

Dr. Kristen Miller, Orthodontist

Dr. Kristen Miller is graduated from UCLA with general dental education and UCSF with her orthodontist training.  She was the Vice President of her dental school class. Dr. Miller participated in the UCSF mobile clinic. Dr. Miller worked in Dr. Zak dental team for over 10 years. She is fluent in Spanish.

Dr. Pedram Fakheri, Periodontist, Our TeamDr. Pedram Fakheri, Periodontist

Dr. Pedram Fakheri graduated with his DDS from the University of Medicine & Dentistry of New Jersey in 2008.  Dr. Fakheri has been proficiently trained in all aspects of periodontics including dental implants, non-surgical and surgical treatment of periodontal diseases, and periodontal bone regeneration. When he moved from the East Coast to West Coast, he received his specialty certification in Periodontics from Loma Linda University in 2011. Dr. Fakheri is fluent in English and Farsi.

Dr. Aiham Machhadani, Endodontist

Dr. Aiham Machhadani graduated from Damascus University in Syria in 1999. He then continued his education at California's Dr. Duggan Study Institute and then at Columbia University, earning his specialty certification in Endodontics. For nearly 20 years, Dr. Machhadani has serviced patients in southern California. In his spare time, Dr. Machhadani lives an active life playing soccer and tennis.