Color stability of bleached tooth enamel brushed with different stain-removing toothpastes.

Objective: The effects of four toothpastes on the color stability of in-office bleached tooth specimens were determined.

Materials And Methods: We evaluated an experimental toothpaste (EXP) and three commercially available toothpastes: Colgate Optic White (OPW), Aquafresh White & Protect (AWP), and Crest 3D White (CDW). OPW, AWP, and CDW contained inorganic abrasives, whereas EXP and AWP contained sodium polyphosphate.

Effect of chemical surface treatment of contaminated CAD-CAM resin composite blocks on surface free energy and bond strength.

Purpose: To evaluate the effects of four chemical treatment methods on the contaminated surfaces of VITA ENAMIC (EN) and CERASMART (CS) resin composite computer-aided design-computer-aided manufacturing blocks (RCBs).

Methods: Each RCB was contaminated with a handpiece oil for 1 minute. These contaminated surfaces were then chemically treated by Gel Etchant (PA), Ivoclean (IC), Monobond Etch & Prime (MB), or Ceramics Etch (HF) reagents (n= 12), after which their shear bond strengths, morphologies, failure modes, and surface free energies were examined.

Effect of various resin cements and immediate dentin sealing on tooth fracture resistance of zirconia inlay restorations.

Purpose: To compare the effect of the immediate dentin sealing (IDS) and resin cement type on fracture resistance of Class II mesio-occluso-distal (MOD) zirconia inlay restorations.

Methods: 90 Class II MOD cavities on freshly extracted human mandibular third molars, prepared with a high-speed handpiece, were divided into two groups: those with IDS (CR+) and without IDS (CR-). The CEREC system was used to prepare zirconia inlays from Katana super translucent multi-layered blocks.

Effect of etching with low concentration hydrofluoric acid on the bond strength of CAD/CAM resin block.

The effect of etching for 90 s with low concentrations (0.5, 1.0, 2.

Effect of kinematic viscosity on the staining performance of caries detector dyes.

The relationship between performance of caries detector dyes and solvent molecular weight has been reported, but viscosity has not yet been investigated. Therefore, using extracted human teeth, we compared 6 experimental caries detector dyes with different viscosities to clarify the relationship between dye viscosity and staining performance in sclerotic dentin. Carious dentin started showing dentin staining when stained with caries detector dyes with kinematic viscosity≥263 mm/s, showed no immunoreactivity for Streptococcus mutans on immunohistochemistry, and contained dentinal tubules free of debris on scanning electron microscopy.