After 3 to 4 months post-surgery, it can be found in some occasions, that the gum shrinks below the prosthetic margin of the implant. Before proceeding with the implant margin preparation, it is important to evaluate if more quantity of keratinized gum is needed around the implant. If that is the case, a GTR (Guided Tissue Regeneration) and or GBR (Guided Bone Regeneration) might be recommended to cover more implant surface.
In the following case, the implant did not require soft tissue augmentation, and therefore the margin of the implant was prepared to a more apical position, in order for the crown to start at gum level.
Surgery: Dr. João Mouzinho (Porto, Portugal). CeraRoot 14 – 10mm long placed in a healed site. conventional crown & bridge impressions, ALL-CERAMIC crown.
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The implant remains at its maximum physical strength when none of its structure it’s modified. That is why we have different shapes of abutments already pre-shaped. In some occasions, the dental professional might find appropriate to prepare the implant structure to improve the aesthetic appearance of the crown.
The image below, shows an example of the diamond grain size that should be used for margin preparation. Usually Yellow or White color identification.
ONLY use “superfine” or “ultrafine” diamond grain size. Do not apply force with the burr to the abutment when grinding/polishing. Very
Always use maximum water spray during the preparation. Do not polish or grind the abutment without water spray.
These are the recommended burr shapes: