The enhanced shear bond strength of resin cement to zirconia with ordered conical spots through the CO laser process.

In this study, a new shear bonding system was created that uses a CO laser to form a pattern of conical spots on a zirconia prosthesis surface to improve mechanical interlocking. Four types of zirconia substrates were employed, which underwent particle abrasion after being polished, machined, spotted, and spot-particle abraded. The surface roughness of each substrate was measured via scanning electron microscopy and X-ray diffraction (XRD).

Clinical assessment of resin-coating technique applied to exposed dentin after crown preparation.

The resin-coating technique, in which exposed dentin surfaces are covered using a thin-film coating material, was approved in the Japanese public health insurance system in December 2019. The purpose of this study was to evaluate clinical cases treated using the resin-coating technique with Hybrid Coat II (HC II) after tooth preparation on vital teeth. A total of 134 cases from patients who visited nine dental clinics were examined from the clinical records.

Effects of silica sputtering on adhesion between zirconia and composite resin cores.

Radiofrequency magnetron sputtering of silicon was applied onto zirconia surfaces by use of a non-doped Si wafer at 2%, 5%, 8%, and 10% oxygen volumes. Immediately after sputtering, the contact angle was practically 0 for all oxygen volume specimens. In terms of sustainability of the hydrophilicity, however, 5% oxygen volume was found to be optimal.

The Effect of TBB, as an Initiator, on the Biological Compatibility of PMMA/MMA Bone Cement.

Acrylic bone cement is widely used in orthopedic surgery for treating various conditions of the bone and joints. Bone cement consists of methyl methacrylate (MMA), polymethyl methacrylate (PMMA), and benzoyl peroxide (BPO), functioning as a liquid monomer, solid phase, and polymerization initiator, respectively. However, cell and tissue toxicity caused by bone cement has been a concern.

Effects of dental porcelain containing silver nanoparticles on static fatigue.

The purpose of this study was to clarify the effect of silver nanoparticles on the behavior of subcritical crack growth (SCG) in dental porcelains. Prior to occurrence of fast fracture in dental porcelains, SCG occurs and leads to strength degradation over time. SCG in dental porcelains can be characterized by the stress corrosion susceptibility coefficient, n.

Effects of adding silver nanoparticles on the toughening of dental porcelain.

Statement Of Problem: Dental porcelains currently used for ceramic restorations are brittle, and it is sometimes necessary to replace fractured or chipped restorations. Porcelain is fragile and exhibits elastic deformation rather than plastic deformation, leading to fracture or chipping of restorations.

Purpose: The purpose of this study was to investigate the toughening of porcelain through the addition of silver nanoparticles.

Toughening of CAD/CAM all-ceramic crowns by staining slurry.

The ability of staining slurries containing silver and/or potassium compounds to enhance the mechanical properties of a leucite-reinforced glass ceramic (IPS Empress CAD) was investigated by measuring the Vickers hardness, median crack length, toughness, and compressive residual stress of specimens. A staining slurry containing potassium ions was found to increase the toughness of IPS specimens more than a staining slurry containing only silver ions when applied prior to sintering. None of the staining slurries produced any color changes.

Addition of platinum and silver nanoparticles to toughen dental porcelain.

Several studies have investigated toughening porcelain that is layered over a frame or a core. The introduction of residual compressive stress to the surface of porcelain has been shown to be effective to strengthen it. In the present study, nanoparticles of precious metals of silver and platinum (rather than non-precious metals) were used to evaluate if they could increase the fracture resistance of porcelain.

[A case report of esthetic and functional rehabilitation by a combination of periodontal and orthodontic treatments for advanced periodontal disease].

Patient: The patient was a 44-year-old woman who presented with masticatory and esthetic problems. She had discoloration of CR filling of a maxillary anterior tooth, marginal discoloration, anterior protrusion, median diastema, and closed bite where the mandibular anterior tooth region occluded with the maxillary alveolar region, tooth 8 elongation and tooth 4 defect. Periodontal and orthodontic treatments were therefore performed for esthetic and functional recovery.

[Manufacture of a titanium full crown by CAD/CAM--tolerance of the cutting tool].

Purpose: We investigated the durability of the cutting tool(bar)that is used when creating a dental crown by using the CAD/CAM system of a computer-assisted NC machine tool.

Methods: We used the chamfer type as the shape of the dental cervical margin of the support tooth model. We also used a mold model whose shaft surfaces on both sides had an 8-degree taper.