The effect of repeated surface treatment of zirconia on its bond strength to resin cement.

Purpose: The aim of this study is to evaluate the influence of repeated surface treatments on wettability and surface roughness for zirconia surface and bond strength of zirconia-based ceramics to resin cement.

Materials And Methods: Seventy blocks (10 × 10 × 3 mm) of zirconia-based ceramics were fabricated and divided into two groups according to the surface treatments: (A) 110 µm AlO airborne-particle abrasion and (R) 110 µm silica modified AlO airborne-particle abrasion. At stage 2, each group was subdivided into 5 groups according to the surface retreatments: (a) 110 µm AlO airborne-particle abrasion, (r) 110 µm silica modified AlO airborne-particle abrasion, (D) diamond bur, (Da) diamond bur + 110 µm AlO airborne-particle abrasion, and (Dr) diamond bur + 110 µm silica modified AlO airborne-particle abrasion.

Influence of polishing systems on roughness and color change of two dental ceramics.

Purpose: To evaluate the polishing effect on roughness and color change of pressed and layering ceramics after immersion in coffee solution.

Materials And Methods: 88 ceramic discs (1.0 mm × 10.