نتایج جستجو برای: shape of teeth
تعداد نتایج: 21178229 فیلتر نتایج به سال:
Two fused cyclopentadithiophenebis(dicyanovinylene) derivatives (FCPDT-16 and FCPDT-C24) with a low-lying LUMO energy level (3.88 eV) and a rigid core structurewere successfully synthesized.They have good thermal stability and form highly ordered packing structures both in the bulk solid state and in thin films. The field effect transistors fabricated from a solution of these two compounds show...
A pyrene-fused phenazinothiadiazole that shows electron mobilities (μe = 0.016 cm(2) V(-1) s(-1)) two orders of magnitude higher than those reported for pyrene-fused pyrazaacenes is described.
The relationship between tooth form and dietary preference is a crucial issue in vertebrate evolution. However, the mechanical properties of a tooth are influenced not only by its shape but also by its internal structure. Here, we use synchrotron transmission X-ray microscopy to examine the internal microstructures of multiple dinosaur teeth within a phylogenetic framework. We found that the in...
For dentists, selecting the exact tooth color is a complex task when restoring natural appearance of teeth. Several factors can affect determination shade, such as lighting conditions, teeth’s condition, viewing angle, background, eye fatigue, vision impairments, and medication use. Thus, it crucial to have complete knowledge about different shades criteria for their selection achieve best resu...
PURPOSE To determine the differences in the perception of aesthetic characteristics of the front teeth which include anatomic variations, appearance of the gums and dental arches, smiles and the lower third of the face between three groups of assessors. MATERIALS AND METHODS The study included 60 patients with permanent fully toothed dentition with no prosthetic work done and with Angle class...
Introduction: Idiopathic osteosclerosis is a common radiopaque lesion in the jaw bones, which is asymptomatic and usually detected accidentally in various radiographs. The purpose of this study was to determine the radiographic features of idiopathic osteosclerosis in the jawbones of patients referring to the maxillofacial radiology center of Mashhad Dental Faculty. Methods: In this descriptiv...
Assessment of the odontoclastic activity in extracted deciduous teeth with and without dental caries
Objectives: The aim of the study is to assess odontoclasts and inflammatory cells in extracted deciduous teeth, with without dental caries, thereby evaluate possibility decreased rate resorption/delay exfoliation due alteration cell count odontoclasts. Material Methods: Twenty teeth (10 caries 10 caries) were collected, prepared, sectioned, stained under a light microscope magnification ×400. H...
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