A multi-unit abutment (MUA) is an abutment most commonly used with dental implants in "All-on-Four" protocols.
[1][2] They are designed for screw-retained group restorations,[3] which are often used in combination with angled dental implants[4] and whole arch replacements, as well as screw fixation of bridges made of zirconium or metal-ceramic group restorations to the implant.
[5][6][7][8] Multi-unit abutments are used to align the prosthesis on a level restorative platform, adjust for variations in implant heights, and place the implant connection at the same level as or just below the gingival surface.
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