Castable Abutment

A castable abutment, also known as the University of California at Los Angeles (UCLA) abutment, is a prefabricated component, with or without a prefabricated cylinder, used to make a custom abutment for a cement-retained or screw-retained prosthesis. It is created by waxing its plastic burnout pattern and subsequently casting the abutment through a lost-wax technique. The custom-made abutment is then used in the construction of an implant or prosthesis. Such abutments can be made of a variety of materials including metal alloys such as titanium, gold, or chrome cobalt, or from polymers such as polyoxymethylene. When used in the placement of an implant, the abutment allows for height and angle correction while also fitting with the surrounding soft tissue. Following the final implant placement, a sturdy but temporary filling material is used to cover the screw access channel for easy access and adjustment should it be required in the future.