statement of the problem: optical properties of the composite resins, concerning their translucency and thickness, are affected by discolored tooth structure or inherent darkness of the oral cavity. purpose: this study aimed to compare the translucency parameter (tp) of five different composite resins in different thicknesses and to evaluate their masking ability in black backgrounds. materials...

OBJECTIVE To examine the distribution of fetal nuchal translucency (NT) thickness in dichorionic twins and investigate the effect of the correlation between NT measurements in each twin pair on the performance of screening for trisomies. METHODS The distribution of fetal NT for crown-rump length (CRL) was examined in 5646 dichorionic twin pregnancies, including 103 with fetal trisomies 21, 18...

Increasing demands for aesthetically pleasing dental restorations have promoted the use of materials that display superior optical properties. Zirconia-based all-ceramic systems good properties, thus providing desired esthetics restorations. The altered oral conditions impact physical properties these materials. Multiple studies been conducted to evaluate effect aging on mechanical computerized...

OBJECTIVE First-trimester aneuploidy screening is in transition from the phase of 'development' to that of 'diffusion.' As with all other technologies, there is risk of diminished performance until newer centers are well experienced. Typically, inexperienced sonographers under-measure nuchal translucency (NT), and experience, training and continual monitoring of data are needed to ensure that m...

conclusions although, the exact cause of pseudotumor cerebri in most individuals is unknown, but we should remind tuberculosis specially in endemic area for this infection. case presentation here, we presented a 14-year-old girl who referred to our hospital for fever, headache, vomiting and diplopia which has not respond to antibiotic therapy for acute meningitis. finally, with more evaluations...

The photometric stereo method for acquiring surface geometry is only valid for a specific class of materials captured under directional lighting conditions. The ideal material for this method is Lambertian a material that completely and diffusely reflects incident light. Translucent materials, while apparently diffuse, break these restrictions. Due to subsurface light transport (specifically, m...

Background: Prenatal diagnosis for Fetal Chromosomal anomalies currently relies on assessment of risk followed by a combination of biochemical and nuchal translucency. Trisomy 21 is the most common trisomy that is associated with intellectual disability. Pregnant women who receive a prenatal diagnosis of trisomy 21 currently have the option of continuing or terminating their pregnancy, but no f...

PURPOSE Glare problems originating from bright lights are generally experienced more strongly at night. The typical disability glare is known to result from retinal straylight. In this study, the effects of pupil diameter and, especially in the case of small pupils, of eye wall translucency on the amount of retinal straylight were investigated. METHODS Straylight was measured as a function of...

Background: There is increased use of all-ceramic crowns in place of ceramo-metal crowns in restorative practices. The difference in properties of different ceramics will affect the final esthetics of the restoration, and we need to consider this, especially when restoring anterior teeth. This article compares and analyzes translucency levels of different zirconia-based ceramic CAD/CAM systems....

Objective: The present study aims to evaluate the color stability and degree of conversion amine-free dual cured resin cement compared light amine-containing cements used with two different translucencies thin esthetic restorations. Material Methods: A total 120 specimens were prepared for testing (n=60). divided into three main groups according type. Group 1: cured, 2: 3: cured. Each group was...