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Device Stability - Introduction

Device Stability - Introduction. retentive capacity (RC) of subpericranial pocket ( SpP ) experiments measure RC. Surgical Technique - Position. minimal incision approach. Surgical Technique - Position. minimal incision approach device assumes “Back” position. “B ack ”.

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Device Stability - Introduction

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  1. Device Stability - Introduction • retentive capacity (RC) of subpericranial pocket (SpP) • experiments • measure RC

  2. Surgical Technique - Position • minimal incision approach

  3. Surgical Technique - Position • minimal incision approach • device assumes “Back” position “Back”

  4. Surgical Technique - Position “Up” • minimal incision approach • device assumes “Back” position • anterosuperior(“Up”) placement of device • minimize contact with supporting surfaces “Back”

  5. Freeroll Angle in Recumbent Position

  6. Surgical Technique - Fixation • suture fixation and pedestal • resists displacement • rotation (fantail groove) • sideways (pedestal/suture) • superior/inferior (pedestal) • lateral (tie down suture) • medial (silicone skirt/dura)

  7. Surgical Technique - Fixation • subpericranial pocket • resists displacement • rotation (SpP) • sideways (SpP) • superior/inferior (SpP/bone) • lateral (SpP) • medial (bone)

  8. Retentive Capacity – 5 Series Average Retentive Capacity Versus Age • 81 Patients • 123 Implants • - 42 bilateral • - 39 unilateral Force (N) Avg RC = 5.17 +/- 2.56 N Parabolic Distribution Age (Years)

  9. Retentive Capacity Across Trials * • Repeated Measures ANOVA • Significant Decrease in RC over repeated trials (p<0.05) Force (N) *

  10. Pedestals – 5p • resist displacement • positioning • affect RC of SpP

  11. Pedestals – 5p • resist displacement • positioning • affect RC of SpP?

  12. Pedestals – 5p • no exposed dura • minimize drilling • reduce surgical time (n=43) • right 15.8 minutes • left 14.1 minutes (37.8 hours = 18-20 implants)

  13. Retentive Capacity – 5p (pedestal) Average Retentive Capacity Versus Age 5p 5 Force (N) Age (Years)

  14. Retentive Capacity Across Trials – 5 & 5p 5p 5 Force (N)

  15. Conclusions • without a pedestal • retentive capacity of subpericranial pocket: • is highly variable (5.17 +/- 2.56 N) • decreases with manipulation • with a pedestal • retentive capacity of subpericranial pocket: • is significantly greater • allows positioning of device • diminishes surgical time • decreases with manipulation

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