282 Theories and techniques of oral implantology

Fig. 7-61. To avoid cold cure acrylic from setting underneath undercut abutment posts, the undercut area may be evened with wax or acrylic. A, The undercut area is evident. B, Acrylic resin is applied layer by layer to the undercut area. C, The trimmed area provides no undercut. When using acrylic over acrylic, the abutment posts must be coated with Vaseline to prevent fusion.

Fig. 7-62. Two types of copings. A, The rectangular copings are designed for post type implants. (Courtesy S. Tramonte.) B, The bell-shaped copings designed by Linkow may be used for any type of abutment post. An irregular surface helps impression materials adhere to the copings.

Fig. 7-63. In an emergency, a soft gold strip may be bent to form a coping.