Northwest Oral Maxillo-Facial Surgeons Oral Surgery, Serving St. Louis & St. Charles Counties Oral & Maxillofacial Surgeons, Dr. Stephen W. Hiatt & Dr. Maryann L. Udy, practice a full scope of oral and maxillofacial surgery with expertise ranging from corrective jaw surgery to wisdom tooth removal. We can also diagnose and treat facial pain, facial injuries and TMJ disorders, and perform a full range of dental implant and bone grafting procedures.