24 documents found, page 1 of 3

In vitro optimization of photobiomodulation and ultrasound stimulation protocol...

The effectiveness of transcranial photobiomodulation (tPBM) and ultrasound stimulation (tUS) to mitigate different neuropathological mechanisms and stimulate neuroprotective responses has been vastly demonstrated in preclinical disease models. However, the translation into clinics is still suboptimal, revealing the need for more solid basic research to ascertain the most effective stimulation parameters to modu...

Short-pulse direct laser writing of 3Y-TZP zirconia: a superior surface modific...

The clinical success of zirconia-based restorations relies on surface modifications that enhance adhesion without compromising material integrity. This study evaluates Direct Laser Writing (DLW) as a non-contact, contamination-free alternative to conventional grit-blasting methods (alumina particle abrasion [SB] and silica-coated alumina treatment [SC]. Surface roughness (Ra), wettability, surface free energy (...

Fitting of different intraradicular composite posts to oval tooth root canals: ...

The purpose of the present study was to perform a preliminary analysis of the fitting of different fiber-reinforced composite (GFRC) posts to tooth root canals and determine the resin cement layer thickness. The following GFRC posts were assessed: bundle posts (Rebilda GTTM, VOCO, Germany), sleeve system (SAPTM, Angelus Ind, Brazil), and accessory posts (ReforpinTM, Angelus, Brazil). Twenty-four freshly extract...

Surface modification of glass fiber-reinforced composite posts by hydrogen pero...

On the rehabilitation of endodontic treated teeth using intraradicular retention, adhesive failures often occur between the intraradicular post and the resin-matrix cement. The main aim of this study was to conduct a scoping review on the surface modification of glass fiber-reinforced composite posts by hydrogen peroxide solutions. An electronic search was performed in the PubMed database, using combi...

Light transmittance through resin-matrix composite onlays adhered to resin-matr...

OBJECTIVE: The aim of this study was to evaluate the influence of the thickness of resin-matrix composite blocks manufactured by CAD-CAM on the light transmittance towards different resin-matrix cements or flowable composites. METHODS: Sixty specimens of resin-matrix composite CAD-CAM blocks reinforced with 89 wt% inorganic fillers were cross-sectioned with 2 or 3 mm thicknesses. The specimens were conditioned ...

Devices used for photobiomodulation of the brain-a comprehensive and systematic...

A systematic review was conducted to determine the trends in devices and parameters used for brain photobiomodulation (PBM). The revised studies included clinical and cadaveric approaches, in which light stimuli were applied to the head and/or neck. PubMed, Scopus, Web of Science and Google Scholar databases were used for the systematic search. A total of 2133 records were screened, from which 97 were included ...

Development and optical reflectance characterization of phantoms mimicking biol...

[Excerto] The search for materials that accurately mimic the optical properties of biological tissues is essential, particularly for research in transcranial photobiomodulation, where it is necessary to comprehend how light propagates through the head tissues. Particularly, there is a lack of information in literature on the reflectance spectra of these materials, which is a property of relevance when determini...

Design, manufacturing, and testing of a laser textured piston ring surface rein...

A CuCoBe–diamond composite was used to reinforce a laser textured 410 stainless steel piston ring by hot-pressing. Different hot-pressing parameters were used to optimize the sintering process of the CuCoBe particles (P = 25 and 50 MPa, T = 820 and 980 °C, and t = 15 and 30 min). The results showed an increase in the hardness of the hot-pressed samples (50.5% and 48.5% for P = 25 and 50 MPa, respectively). Thre...

Laser texturing of piston ring for tribological performance improvement

The radial surface coating layer of compression piston rings is used to improve their wear resistance during the internal combustion engine operation. However, at top dead centers, the friction coefficient of the piston ring–cylinder liner pair is detrimental to the engine’s tribological performance. In this work, dimples with different texture dimensions and densities were tested in a home-developed tribometer...

Transmitância ótica de resinas compostas na cimentação de restaurações indireta...