Recurrent fractures of prosthetic screws with zygoma implants Prosthetic screw
No screw
Luc@Vrielinck.be
broken screw
Situation • Patient desires: – improved retention of prosthesis in the upper jaw
• Diagnosis: – Ill fitting prosthesis in upper jaw – Severe atrophy in UJ (Div D, Misch)
• Treatment plan: – Quad zygoma, delayed loading, overdenture
Chronology • • • • •
30/06/2009: Implant placement quad zygoma 04/01/2010: second stage Prosthetic treatment not in our department 09/09/2010: final control 05/05/2011: emergency consultation ¾ prosthetic screws were broken
Intake 31/03/2009
31/03/2009: Intake
31/03/2009: Intake
31/03/2009: Intake
31/03/2009: Intake
31/03/2009: Intake
Implantplanning
Analytical Bone Table
Implant planning according to the Stella Technique
26/04/2009: Implant planning
Treatment
30/06/2009: Postoperative
30/06/2009: Postoperative
04/01/2010: second stage
04/01/2010: second stage
04/01/2010: second stage
Endresult 09/09/2010
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
09/09/2010: end result
Follow-up > 1 j 05/05/2011
Emergency consultation • 06/06/2011 – Problem: • Bar loosens frequently and repetitive fractures of the prothetic screws
05/05/2011: Quad zygoma and repetitive fractures of the prosthetic screws
Prosthetic screw
No screw
broken screw
05/05/2011: Quad zygoma and repetitive fractures of the prosthetic screws
What are the causes? What would you do ?