Margaret Zadnik-O’Connell



Margaret Zadnik-O’Connell, DDS, PC

439 Main St.

Islip, NY 11751

412 Jericho Turnpike

New Hyde Park, NY 11040


Meet our doctors

Dr. Margaret Zadnik-O’Connell 

Dr. Margaret Zadnik-O'Connell earned a dual B. S. degree in chemistry and biology from Ashland University in Ashland, Ohio.


She joined the School of Dental Medicine at Case Western Reserve University in Cleveland. She earned her Doctor of Dental Surgery (DDS) with magna cum laude recognition.


Dr Zadnik-O'Connell moved to Long Island, NY, and completed her residency, specializing in orthodontics from Stony Brook University.

About the doctors

Nicole Cuoccio, DMD

Dr. Cuoccio is a Long Island native. She attended Adelphi University where she earned a B.S. in biology and graduated summa cum laude.


She then earned her D.M.D. degree from Tufts University School of Dental Medicine.


Besides her graduation with summa cum laude honors, Dr. Cuoccio was inducted into the Omicron Kappa Upsilon honor society. She also completed a humanitarian mission trip to the Dominican Republic and founded a community dental outreach program.

She thoroughly enjoys her practice in orthodontics. The happy smiles from her patients and parents she comes across daily are enough indications how well our practice is appreciated.


Dr. Zadnik-O’Connell and her husband, Chip, have 3 very active children.


They fill their pleasure time with family and friends. They are also into playing baseball, running, boating, travelling, and peaceful visits to the arboretum.

Pic of Maggie Dr _Cuoccio

Meet the doctors of Margaret Zadnik-O’Connell, DDS, and South Bay Orthodontics.

After dental school, Dr. Cuoccio completed her orthodontic training at Montefiore Medical Center, the teaching hospital for Albert Einstein College of Medicine.


She is a member of the American Dental Association, the American Association of Orthodontics, and the Northeast Society of Orthodontists.


Dr. Cuoccio lives with her husband and two dogs, Duncan and Stella. She enjoys playing tennis, cooking, and traveling.


Call us today for a

COMPLIMENTARY initial consultation.







New Hyde Park