Date post: | 02-Jan-2016 |
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Upload: | kenneth-cannon |
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• Aim
• Clinical indication
• Manufacturing scan prosthesis
• CT scan protocol
• Double scan registration wizard
Double scan
• Visualize tooth setup within CT imagesImplant planning can be based on both clinical and aesthetic considerations
• Visualize mucosa surfaceNecessary for manufacturing of mucosa-supported SurgiGuide
Aim
• Good fitting removable dentureNo air between gingiva and prosthesisto avoid
=> false indication mucosa thickness
=> malfitting mucosa-supported SurgiGuide
• Prosthesis– Material: acrylic resin– No radio-opaque teeth– No metallic parts– Base plate minimally 2 mm thick
Manufacturing scan prosthesis
• Markers– Radio-opaque material
(e.g. gutta-percha, Titanium, Cavit®)
– Shape: spherical– Dimensions: app. 2 mm diameter– Number: 8 (4 -15) – Good distribution
• Spread over entire prosthesis• Some close to tooth-gingiva border• Some close to outer border prosthesis
Manufacturing scan prosthesis
• CT-scan of patient– Patient must wear the scan prosthesis– Positioning in scanner
CT scan protocol
Conventional CTCone Beam CT
• CT-scan of patient– Scan parameters
CT scan protocol
Matrix 512 x 512
Field of View 140 – 170 mm
Slice thickness 0.5 mm (max. 1.0 mm)
Feed per rotation 1.0 mm
Reconstructed slice increment 0.5 mm (max. 1.0 mm)
Reconstruction algorithm Bone or high resolution
Gantry tilt 0°
• CT-scan of prosthesis– Positioning in scanner
Similar as positioned in patient’s mouth
CT scan protocol
Maxilla Mandible
Conventional CTCone Beam CT
• CT-scan of prosthesis– Fixation of prosthesis in scanner
Use only radiolucent materialAt least more radiolucent than prosthesis
itself– Image range
Full prosthesis- Scan parameters
At least same as for patient scan, But higher resolution is allowed
CT scan protocol
• Import scan of patient• Scan registration wizard
Double scan registration wizard
Adapt box to only include radio-opaque markers!
ORDICOM images of scan of prosthesis
preferably in separate folder!