Implant Impression Techniques Flashcards
What are implant impressions accurate recordings of?
Spatial implant position.
It is required to obtain a proper support to definitive restoration with passive fitting
Implants are _____ and implant ______
It is important to use the correct parts and tools specific to the implant brand
Brand
Specific
Components of implant impressions
Stock
Custom
Proprietary
Non-proprietary
What do accurate implant impressions record?
3D position of implant in oral cavity
What are the benefits of impression in implant dentistry ?
Record position, depth, angulation, soft tissue contour (emergency profile)
Analog impression coping long vs short
Long (anterior)
Short (posterior)
Digital
Scan bodies
Before impressions
Provisionals = smooth
at time of impressions
Work fast and accurate
Control heme
What protocol is prior to impressions
Chlorohexidine
T/F: you need an accurate CR record and manage soft tissue during impressions
True
Implant level impression technique
Open tray vs closed tray
Impression of the implant platform using an implant impression coping
Abutment level impression technique
Impression of an abutment either directly using conventional techniques, or indirectly using an abutment impression coping
Open tray impression
Direct
Impression technique that uses an impression coping with retentive features around which a rigid elastic impression material injected. To remove the impression coping first unthread through opening on the occlusal surface of the tray
Open tray
Closed tray impression technique
Indirect impression
Impression technique that uses an impression coping with positioning features, around which a rigid elastic impression material is injected. After removal of the impression coping is unthreaded from the mouth, connect a laboratory analog and reposition into the impression prior to pouring
Closed tray
Open tray indications
Single units
Multiple units that need to be splinted
Implants with no sufficient parallel to allow impression to be withdrawn
Open tray complications
Difficulty when position the tray
Locked in if you do not expose the impression coping
closed tray indications
Single unites
Limited interarch distance
Implants that are sufficiently parallel
Closed tray complications
Inaccuracy when reposting copings
A device that registers the position of a dental implant abutment in an impression. It may be retained in the impression (direct) or may require a transfer from intraoral usage to the impression after the attachment of the corresponding analog (indirect)
Impression coping
replica of an implant, abutment or attachment mechanism, usually incorporated within a cast for a prosthetic reconstruction
Analog
Step 1
Wait 2 weeks (soft tissue healing) after surgeon gives approval from implant uncovers
Step 2
Identify implant, company, type, platform diameter in pt chart of PA radiograph. Get approval from faculty
Step 3
Select open tray vs closed tray
Step 4
Select 1coping according to technique
Step 5
Select 1 analog
Step 6
If provisional (recommended for anterior teeth)
Soft tissue contour- anterior implant restorations
Get provisionals in order to contour the tissue
Additional charge for pt
Soft tissue contour timeline
Depends
2 weeks -2 months
Smooth temps
Capturing the final matured soft tissue
Customized impression coping
Digital capture
How long to wait before making the final impression?
Facial GM stabilized 3 months after abutment connection
4 months
the area of the implant abutment and crown located immediately apical to the gingival margin; 1 mm range apicocoronally
Critical
Determining the zenith and labial gingival margin
Facial (critical)
Whether crown has a triangular or square shape
interproximal (critical)
Located apical to the critical contour provided that sufficient running room is present. Should not affect GM or shape of crow. Flat, convex, concave
Subcritical
T/F: alteration of both critical and subcritical contour can be used to enhance peri implant soft tissue esthetic
True
Certain situations where changing the shape of the implant crown - non desirable
Critical contours should not be altered
Only modification for a more favorable esthetic outcome through enhancement of the soft tissue profile without altering the shape of the implant crown
Subcritical contour
Over contoured surface will push tissue ________
Under contoured surface will allow tissue to move ________
Apically
Coronally
Bite registration aids
Specific to implant size and platform
Specific to implant company
Tall and short lengths - check bite
Engage impression material
Snap into implant
Soft tissue models
Soft tissue contours are critical to fabrication of fixed and removable implant esthetic
Ensures emergence profile of fixed abutments replicated natural tooth esthetics
Allows lab to see the GM and know the thickness of the soft tissue in order to fabricate the crown
