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than titanium. The improved gingival outcome may be related to zirconia’s chemical composition because bacterial adhesion was reduced when zirconia was compared with titanium specimens with the same roughness, wettability, and topography.
which may result in a transmucosal seal between the subgingival part of a zirconia abutment or prosthesis and mucosal tissue. Higher adhesion and proliferation of human gingival fibroblasts has been reported on zirconia and alumina surfaces without a porcelain layer
When a zirconia abutment is designed for porcelain layering or for a cement-retained crown, the finish margin determines the division between the subgingival portion of the prosthesis and the supragingival area,
facilitating the application of porcelain and glaze in the appropriate location. However, in monolithic screw-retained prostheses, it is quite difficult to characterize and glaze without applying the material to the subgingival area because of their low viscosity. Screw-retained monolithic zirconia protheses have become popular because of fewer technical complications than porcelain layered prostheses
The author is unaware of a description of a technique to prevent glaze or pigments from reaching the subgingival portion of monolithic zirconia prostheses. It is likely that to obtain a polished and nonglazed zirconia surface, a grinding and polishing process in the subgingival area is performed after conventional characterization and glazing firing cycles. However, grinding may reduce the material strength.
Therefore, this article describes a straightforward technique that ensures that the subgingival portion of a monolithic prosthesis in zirconia will not receive glaze or pigments.
Delimit the gingival margin in the monolithic zirconia prosthesis (Ceramill Zolid FX Multilayer; Amann Girrbach AG) (Fig. 1), which can be performed on the definitive cast.
Below the line, apply a coat of firing support paste (IPS Object Fix; Ivoclar Vivadent AG). Adjust the paste layer with a water-moistened brush until the contour is adequate, leaving exposed only the part of the crown to be characterized (Fig. 2A).
Characterize and glaze as usual, repeating firing cycles until the desired result is achieved (MiYO Liquid Ceramic Color; Jensen Dental) (Fig. 2B).
After the last glaze firing, remove the support paste. It is removed easily by hand and water. Note that the covered part has not received pigments or glaze (Fig. 3A).
Polish the subgingival area with specific zirconia diamond-impregnated rubber polishing discs using light pressure and following the sequence and rotational speed recommended by the manufacturer (Diacera HP L26DCmf and Diacera HP L26DC; EVE Ernst Vetter). To achieve higher smoothness, use a polishing paste (Polish ZrO2; Renfert) (Fig. 3B).
Carrillo de Albornoz A.
Effects of modified abutment characteristics on peri-implant soft tissue health: A systematic review and meta-analysis.