Effect of different surface treatments on the micro tensile bond strength to dentin, biaxial flexural strength and roughness of CAD/CAM resin composite and polymer infiltrated ceramic.

Objectives: To evaluate the biaxial flexural strength (BFS), surface roughness (Ra) and micro tensile bond strength (μTBS) of two CAD/CAM materials after different surface treatments.

Materials And Methods: For μTBS, 64 human molars were used and 32 blocks of resin composite (RC-Lava Ultimate) and polymer-infiltrated ceramic (PIC -Vita Enamic). The blocks and teeth were distributed into 16 groups according to the factors "surface treatment" (HF: 10% hydrofluoric acid; APA: AlO sandblasting; SC: silicate-AlO sandblasting; MEP: Monobond Etch and Prime) and "thermal cycling" (TC).

Effect of different loading pistons on stress distribution of a CAD/CAM silica-based ceramic: CAD-FEA modeling and fatigue survival analysis.

Purpose: This study evaluated the effect of different loading pistons, made of various materials and with different elastic moduli acting as antagonist material, on stress distribution and fatigue behavior of a CAD/CAM silica-based ceramic.

Materials And Methods: Discs of CAD/CAM made silica-based ceramic (N = 60) (VITA MARK II) were divided into six groups (n = 10 per group), according to the test method (M: Monotonic; F: Fatigue) and the antagonist piston material (T: Tungsten; S: Steel; G: Epoxy resin). FT, FS and FG combinations were submitted to mechanical cycling (2 × 10 cycles, 4 Hz, 45 N).

Parotid duct sialolithiasis in a patient with Down syndrome--case report.

Sialolithiasis is the phenomenon of blockage of the salivary glands. It frequently is associated with swelling, pain, and infection of the affected gland. Clinically, sialolithiasis manifests as an increase in the size of the affected gland and increased salivary secretion that results in pain during eating.