Implant Crown Impression and Cementation
Check which the implant has been placed: Bicon, Tatum,
submerged SM), UF or IBS and whether a provisional is cemented.
Prepare an appropriate abutment screw driver. For SM
implant, use a 1.7 Torx driver to tighten the abutment; for UF and IBS use 1.2 hex
driver to tighten the abutment
After removing the temporary crown if present, use the reduction rings 1 mm and
2 mm to check the occlusal clearance
If the clearance is > 2 mm, change to a longer abutment so that the crown is
less likely dislodged
Apply Cetacaine to the gingival sulcus
Insert the 000 and 00 cords with the cord packer. If the margin is too low or too high, change the abutment
Take out a high speed hand piece if necessary
If we decide to fabricate a cemented crown, follow Step A; screw type crown,
jump to Step B
Step A
Use the Cavitron to remove Cavit and cotton pellets in the center of the cemented abutment
Use a machine hex driver and a calibrated torque wrench to tighten to 30 Ncm for
DIO, 25 Ncm for IBS. Rest for 10 min. Turn
to 35 Ncm for DIO and 30 Ncm for IBS.
This precaution is to reduce chance of abutment screw loosening
Insert the plumber tape into the center of the cemented or pair abutment until
it is filled. If there is not enough tape, use the Cavit to close the access of
the abutment.
Use a wet cotton pellet to clean up if Cavit is applied
As to Tatum unipost, use Ketac cement for short (3 mm), small diameter one; a
resin cement for angled one
Step B
Try in impression tray
Remove the larger cord
Take PVS impression
Choose shades for the crown and obtain consent from the patient
Write down patient’s name and shades in prescription paper.
Check a proper material for the crown.
Particularly make note whether screw type crown is going to be
fabricated: access hole on the cingulum or the middle of occlusal surface
Make a temporary crown or reline and apply temporary cement
Remove excess cement, including using floss
Let the patient read temporary crown precaution
Send the case to the lab
Before each cementation, check which type of crown is fabricated: cemented or screw-type on the note or lab box
For the latter, try in the crown for proximal and occlusal contact as usual
Remove Cavit and place cotton pellet loosely in the void
Apply sufficient amount of cement, remove excess cement from the crown channel while the cement is
setting and wait for complete cement setting.
Check proximal and occlusal contact again
Remove cotton pellet (prepare peeso bur), unscrew crown/abutment complex and
remove excess cement
Follow step 2 of Step A
Check proximal and occlusal contact again
Plumber tape or cotton pellet loosely; occlusal composite (flowable for anterior teeth); check occlusion
Xin Wei, DDS, PhD, MS 1st edition 08/21/2016, last revision 08/28/2016