prosthetic screw fractures in a case with zygoma implants
DESCRIPTION
a case report with recurrent fractures of the prosthetic screws, due to inadequate design of the prosthetic barTRANSCRIPT
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 ?