2. Long implants a last resort Luc Vrielinck
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Transcript of 2. Long implants a last resort Luc Vrielinck
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What are long implants?
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Volume of
Zygoma bone:
2 x 2 x 2 cm
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Overview
• Indications
• Techniques for long implants
• Clinical examples
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Indications for long implants
• Terminal bone atrophy
• Failures of previous reconstructive procedures
• Defects (congenital, acquired, posttraumatic)
Long implants = end of the line in treatment modalities
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What is terminal bone atrophy?
• Classification of bone atrophy
• How do we diagnose terminal bone
atrophy?
• Overview af treatment modalities with
advancing atrophy
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The Misch Classification of bone resorption
A B B-w C-w C-h D
↓ Width ↓ Height
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From: Dental Implant Prosthetic, Carl Misch
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Misch classification
• Relates degree of bone atrophy to time
elapsed since extractions
• Allows a comparison of comparable cases
in the literature
• Resorption can be „modulated‟ by a
number of factors resulting in accelerated
resorption
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What is terminal bone atrophy?
• Classification of bone atrophy
• How do we diagnose terminal bone
atrophy?
• Overview af treatment modalities with
advancing atrophy
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Measuring = knowing: the bone table
H: 13.81 mm
W: 7.27 mm
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Example : Bone table
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Bone Table
• Principle:
– For each implant location
– Measure height and width
– Take into account eventual alveolectomy
– Compare measured values against minimum
required bone volume
– E.g. Height 10 mm; Width 6 mm
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16 15 14 13 12 11
21 22 23 24 25 26
Bone table for the Upper Jaw
16 15 14 13 12 11 21 22 23 24 25 26
Hgt - 3.1 2.0 3.1 3.3 3.6 5.7 5.2 5.9 4.8 3.4 1.7
Th - 2.0 1.8 3.4 3.5 3.6 4.3 4.3 4.9 3.76 3.1 1.9
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What is terminal bone atrophy?
• Classification of bone atrophy
• How do we diagnose terminal bone
atrophy?
• Overview af treatment modalities with
advancing atrophy
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Typical treatment strategies with
increasing bone atrophy
Div A Div B Div C Div D
A B B-w C-w C-h D
Standard implants
All-on-4
Sinus lift
Short
Zygoma
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Overview
• Indications
• Techniques for long implants
• Clinical examples
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Techniques for long implants
• Intrasinusal (Brånemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
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Intrasinusal zygoma
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Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
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Anterior slot technique
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Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
![Page 26: 2. Long implants a last resort Luc Vrielinck](https://reader031.fdocuments.in/reader031/viewer/2022020323/568c4ad31a28ab491699c395/html5/thumbnails/26.jpg)
Extramaxillary
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Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
![Page 28: 2. Long implants a last resort Luc Vrielinck](https://reader031.fdocuments.in/reader031/viewer/2022020323/568c4ad31a28ab491699c395/html5/thumbnails/28.jpg)
Quad zygoma
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Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
![Page 30: 2. Long implants a last resort Luc Vrielinck](https://reader031.fdocuments.in/reader031/viewer/2022020323/568c4ad31a28ab491699c395/html5/thumbnails/30.jpg)
Pterygoid / Sphenoid
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Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Pterygoid implants
• Skullbase implants
![Page 32: 2. Long implants a last resort Luc Vrielinck](https://reader031.fdocuments.in/reader031/viewer/2022020323/568c4ad31a28ab491699c395/html5/thumbnails/32.jpg)
Skull base
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To guide or not to guide?
• Mental navigation
• Drill guide surgery
• Navigation technique
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Mental Navigation
• Surgery is simulated on 3D software
• Performed freehand by the surgeon using
surgical skill and 3D knowledge of the
surgeon
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To guide or not to guide?
• Mental navigation
• Drill guide surgery
• Navigation technique
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Drill guide
• Types:
– SurgiGuide™ (Materialise)
– NobelGuide™ (NobelBiocare)
• Sometimes give a false impression of
safety
• Blind surgery if performed flapless
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Surgery performed with a drill Guide
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Postoperative imaging
Here we have an obvious problem !Apparent correct position of
both implants
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Preoperative and postoperative matching
Frontal view Occlusal view
Distal displacement of the tip of the right
Zygomatic implant
Orange= planned position; Yellow = placed position
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Top view Left lateral view
Orange= planned position; Yellow = placed position
Cranial displacement of the tip of the left
implant with pterygoid anchorage
>15 mm
>10 mm
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To guide or not to guide?
• Mental navigation
• Drill guide surgery
• Navigation technique
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Navigation technique
• Is more interactive than drill guide surgery
• Peroperative finding sometimes
≠radiological findings
• Seems to be the most flexible approach
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To Guide or not to Guide?
• Usefulness of a conventional drill guide in
zygoma implants seems rather limited due
to very large exit points deviations
• Navigation technique seems to be very
promising
• Mental navigation depends on the
surgeons skills and ability to visualise in
3D
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Overview
• Indications
• Techniques for long implants
• Clinical examples
![Page 48: 2. Long implants a last resort Luc Vrielinck](https://reader031.fdocuments.in/reader031/viewer/2022020323/568c4ad31a28ab491699c395/html5/thumbnails/48.jpg)
Techniques for long implants
• Intrasinusal (Bränemark)
• Stella
• Extramaxillary
• Quad zygoma
• Zygoma and pterygoid
• Skullbase implants
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Techniques
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Intrasinusal
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4 standard implants frontal, 2 zygoma dorsal
Intrasinusal
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4 standard implants frontal, 2 zygoma dorsal
Simplant SurgiGuide™ Safe System™ prototype (2001)
Intrasinusal
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4 standard implants frontal, 2 zygoma dorsal
Simplant SurgiGuide™ Safe System™ prototype (2001)
Intrasinusal
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4 standard implants frontal, 2 zygoma dorsal
Simplant SurgiGuide™ Safe System™ prototype (2001)
Intrasinusal
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Intrasinusal
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Stella
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Stella
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Stella
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Typical position for a “Stella”
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Extramaxillary
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Extramaxillary
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Buccal coverage with a Titanium mesh
Pterygoid implant
Extramaxillary Zygoma implant
Extramaxillary
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Extramaxillary
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Extramaxillary
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Quad Zygoma
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Div D Div D Div D
Quad Zygoma
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16 13 11 21 23 26
Hgt 6.00 10.08 7.78 8.53 9.79 -
Th 1.82 3.77 5.37 2.52 2.81 -
Quad Zygoma
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Quad Zygoma
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Quad Zygoma
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Bone supported zygoma drill guide
Quad Zygoma
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4x Extra maxillary Zygoma implants
Quad Zygoma
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Coverage with Isotis™
Quad Zygoma
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Postoperative view
Quad Zygoma
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Pterygoid implants
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Skull base implants
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1997
Skull base implants
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1999
Skull base implants
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2000
Finally all implants get lost …
Skull base implants
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Skull base implants
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12/09/2005: Follow up
Skull base implants
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12/09/2005: Follow up
Skull base implants
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12/09/2005: Follow up
Skull base implants
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12/09/2005: Follow up
Skull base implants
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18/05/2010: Follow up 8 jaar
Skull base implants
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18/05/2010: Follow up 8 jaar
Skull base implants
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18/05/2010: Follow up 8 jaar
Skull base implants
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18/05/2010: Follow up 8 jaar
Look at the extreme vertical height of the prosthesis
Skull base implants
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Where to find additional information?
• Zygoma Course 10 and 11/12 in Brussels
• www.linkedIn.com
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Two day Zygoma course in
Brussels on 10 and 11/12/2010
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Where to find additional information?
• www.linkedIn.com Zygoma implant group
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Conclusion
• Long implants can offer a solution for
totally „hopeless‟ cases
• The technique requires advanced surgical
skills and top notch prosthetic therapy
• The preoperative and postoperative
trajectory must be closely monitored in
order to evaluate the long term results of
this technique
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