title: Mandibular matrix implant system: a method to restore skeletal support to the lower face.
abstract: Disharmony between the skeletal support and the softtissue envelope is a common cause of aesthetic concerns regarding the lower face. A loss of volume or a genetically small mandible affects the aesthetics and function of the mouth, chin, and neck. Because of the limitations of correcting such problems with current implants made of silicone or porous polyethylene, the author developed an implant system and a method of restoring the entire volume of the mandible called the mandibular matrix implant system. This implant system is made of high-density porous polyethylene and is composed of an articulated wraparound geniomandibular implant and a wraparound gonial angle implant. A prejowl implant can be integrated in the system as an addition or as a replacement for a chin implant. This implant system has different sizes and projections, and it can be modified by carving to fit the requirements of most patients. Carving is done using an appropriate sizer. This implant system is indicated for use in patients with a congenitally small mandible, edentulous patients, and patients requesting facial enhancement. The mandibular matrix implant system is implanted either during a single procedure or simultaneously with a facial rejuvenation. The extended geniomandibular implant is introduced through an anterior oral sulcus incision or a submental incision. The mandibular angle implant is introduced through a retromolar incision. The posterior end of the chin implant overlaps the anterior end of the gonial implant, and screw fixation of each chin component helps to stabilize the entire system. Antibiotics, irrigation, and closure of the incisions are performed before any additional operative procedure. The complete system has been used in 13 patients; one additional patient had the complete system plus an overlapping additional left prejowl implant for correction of asymmetry. Complications were manageable; these included one mandibular angle implant displacement and one infection. The implant displacement required a reoperation to reset the implant. The infection was treated with irrigation and closed system suction; the implant was salvaged. The satisfaction of patients has been high, and the author can now solve aesthetic problems that in the past were considered unsolvable.
authors.affiliation: Johns Hopkins University and the University of Maryland Schools of Medicine, Baltimore, USA. oscar@ramirezmd.com
authors.forename: O M
authors.initials: OM
authors.lastname: Ramirez
mesh_terms: D002680:Chin / Q000601:surgery; D004954:Esthetics; D005146:Facial Asymmetry / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008341:Mandibular Prosthesis; D019930:Mandibular Prosthesis Implantation / Q000379:methods; D008875:Middle Aged; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D015361:Rhytidoplasty / Q000379:methods