Turkyilmaz Ilser
Dental School Implant Clinic, Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, Texas 78229-3900, USA.
Tex Dent J. 2012 Apr;129(4):389-95.
Although dental implant treatment is a very successful option today, a meticulous treatment planning and close collaboration between the oral surgeon and restorative doctor is crucial to eliminate undesired outcomes.
To present a challenging case restored with a maxillary screw-retained fixed prosthesis using malpositioned/malaligned implants.
A 47-year-old female had a Lefort I fracture and lost all maxillary teeth due to traumatic injury in a traffic accident. Seven maxillary implants were placed using a 1-stage surgical approach, 6 months after open reduction surgery in a private practice. Radiographic and clinical evaluation indicated marginal bone loss around 3 anterior implants. The malposition and malalignment of implants made impression and casting procedures very complicated. The other challenging factors with this patient were microstomia, limited mouth opening due to scar tissue from previous plastic surgery, and a very small maxilla. The 1-piece metal framework did not fit accurately so it was sectioned into 3 segments. The 3 separate segments were screwed on the abutments individually, then connected to each other using an acrylic resin. The 3 framework segments were laser welded. After the laser welding, a passive fit of the framework was achieved.
It has been suggested that providing an implant treatment to a patient with implants placed in wrong positions with undesired angulations can be very difficult. Also, laser welding may be a viable option to eliminate misfit of full-arch metal frameworks.
