Marriottsville Dentists; Dr. Karen Roschella and Dr. Ann Zinger. Roschella & Zinger Dental Group welcomes new patients in the Maryland areas of Marriottsville, Ellicott City, Woodstock, Columbia, Sykesville, Eldersburg, Frederick, and Mt. Airy. Our female dentists provide general dental restorative services including porcelain veneers, restoring dental implants, cosmetic bonding, crowns and bridges, Lumineers, and digital x-rays. Roschella & Zinger Dental Group also have a board certified Periodontist (periodontal dentist) on staff providing gum treatment, periodontal surgeries and implant procedures.