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a case report with recurrent fractures of the prosthetic screws, due to inadequate design of the prosthetic bar
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Recurrent fractures of prosthetic
screws with zygoma implants
Prosthetic screw No screw 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
26/04/2009: Implant planning
Implant planning according
to the Stella Technique
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 ?
