Effect of toothbrushing with conventional and whitening dentifrices on monolithic zirconia after finishing procedures.

Purpose: To evaluate the effect of toothbrushing with conventional and whitening dentifrices on the color difference (ΔE₀₀), gloss (Δgloss), and surface roughness (SR) of stained stabilized zirconia with 5 mol% of yttrium oxide (5Y-TZP) after polishing or glazing.

Methods: Specimens were divided into four groups (n=20): C (control), S (staining), SG (staining and glazing) and SP (staining and polishing). 50,000 toothbrushing cycles were performed with conventional (n=10) and whitening (n= 10) dentifrice slurries.

Abutment rotational freedom evaluation of external hexagon single-implant restorations after mechanical cycling.

Purpose: The purpose of this study was to evaluate the rotational freedom between implant and abutment counterpart of two abutments types over external hexagon implants submitted to mechanical cycling.

Materials And Methods: Ten implants with external hexagon (3.75 mm × 13 mm), five cast abutments, and five premachined abutments both with 4.