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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
Device Stability - Introduction

  • retentive capacity (RC) of subpericranial pocket (SpP)

  • experiments

    • measure RC


Surgical technique position
Surgical Technique - Position

  • minimal incision approach


Surgical technique position1
Surgical Technique - Position

  • minimal incision approach

  • device assumes “Back” position

“Back”


Surgical technique position2
Surgical Technique - Position

“Up”

  • minimal incision approach

  • device assumes “Back” position

  • anterosuperior(“Up”) placement of device

    • minimize contact with supporting surfaces

“Back”



Surgical technique fixation
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)


Surgical technique fixation1
Surgical Technique - Fixation

  • subpericranial pocket

  • resists displacement

    • rotation (SpP)

    • sideways (SpP)

    • superior/inferior (SpP/bone)

    • lateral (SpP)

    • medial (bone)


Retentive capacity 5 series
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)


Retentive capacity across trials
Retentive Capacity Across Trials

*

  • Repeated Measures ANOVA

  • Significant Decrease in RC over repeated trials (p<0.05)

Force (N)

*


Pedestals 5p
Pedestals – 5p

  • resist displacement

  • positioning

  • affect RC of SpP


Pedestals 5p1
Pedestals – 5p

  • resist displacement

  • positioning

  • affect RC of SpP?


Pedestals 5p2
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)


Retentive capacity 5p pedestal
Retentive Capacity – 5p (pedestal)

Average Retentive Capacity Versus Age

5p

5

Force (N)

Age (Years)



Conclusions
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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