About Center City Oral and Maxillofacial Surgery Oral & Maxillofacial Surgeon, Kai-Zu Chi, DMD, MSEd, MD, Philadelphia, PA, one of the few female oral surgeons in the nation, received extensive education and training in the fields of oral and maxillofacial surgery. While the practice focuses on full range of dental implant and bone grafting surgeries, wisdom teeth removal, and minimally invasive facial rejuvenation procedures, Dr. Chi is proficiently trained in the surgical management of the hard and soft tissues of the facial region.