Fabrication of Custom Ocular Prosthesis Using a Graph Grid: A Case Report

Patients  requiring  treatment  with  custom  ocular  prosthesis  are  those  who  have  lost  ocular  structures through orbital evisceration or orbital enucleation which was necessary as a surgical intervention for a congenital  defect,  pathology  or  an  accident.  The  disfigurement  associated  with  eye  loss  can  cause significant  physical  and  emotional  disturbance.  As  iris  placement  is  a  technique  sensitive  procedure, visual assessment alone may not be accurate.The  present article  is an illustration of a case report  of  a lady chosen for a custom ocular prosthesis. The method described here uses a transparent grid template from which the iris is traced. An attempt is also made to mimick the shade and colour of the sclera in the wax  pattern  itself;  using  white  paraffin  wax.  This  gives  an  accurate  registration  of  the  position  and  alignment of iris disc assembly, giving a natural look.  Key  words: Custom  ocular  prosthesis,  graph  grid. &nbsp

Dual-functional cathode buffer layer for power conversion efficiency enhancement of bulk-heterojunction solar cells

Here, we report a luminescent cathode buffer layer (CBL) for power conversion efficiency (PCE) enhancement of organic solar cells (OSCs). ZnO doped with Aluminum (Al) and Europium (Eu) was cast as CBL by a solution-processed method. CBL serves a dual purpose by acting both as a spectral conversion and an electron transporting layer. The luminescent ZnO:Al,Eu CBL layer has broad absorption spanning the ultraviolet (300-400 nm) spectrum, contributing to absorption enhancement. Moreover, the emission of CBL layer overlaps with the absorption of poly [N -9'-heptadecanyl-2,7-carbazole- alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) polymer thus elevating the overall absorption of the active layer and improving the photocurrent With this ZnO:Al,Eu CBL in the inverted device configuration (ITO/CBL/active layer/MoOx/Al), an enhanced power conversion efficiency (PCE) of 6.9% was obtained while the device with pristine ZnO as CBL showed PCE of 5.9%. A blend of PCDTBT donor and [6,6]-phenyl C-71 butyric acid methyl ester (PC71BM) acceptor was used as an active layer in both the cases. In ZnO:Al,Eu CBL layer, Al doping improves the conductivity, while Eu doping significantly enhances the emission in the visible region by down-shifting the incoming solar UV light to the visible range which overlaps with the absorption of PCDTBT polymer resulting in energy transfer and improved overall device efficiency. The findings of the study show the significance of luminescent znO:ALEu nanoparticle CBL in enhancing the performance of organic solar cells

Implant-assisted removable partial denture: An approach to switch Kennedy Class I to Kennedy Class III

The Kennedy Class I and II distal extension situation poses a challenge to the prosthodontist as it inherently possesses a lack of stability, which may be attributed to the difference in compressibility of the mucosa and the periodontal ligament surrounding the distal-most abutment tooth. This results in a rotational tendency of the prosthesis around the line connecting its terminal abutments. Placement of osseointegrated dental implants in the posterior edentulous regions, distal to the terminal abutment provides improved vertical support to the distal extension removable partial denture, effectively converting its intraoral performance from a Kennedy Class I to a Class III situation, thereby resulting in improved stability of the prosthesis and consequently, enhanced patient satisfaction. This case report describes such an approach to the restoration of a Kennedy Class I partially edentulous situation

A comprehensive review on synthesis and applications of single crystal perovskite halides

Halide based perovskite materials have fascinated strong attention for being a hopeful candidate for optoelectronic device applications. Single-crystalline halide perovskites exhibit no grain boundaries and possess low trap densities; and are therefore likely to show superior optoelectronic performances in comparison to their polycrystalline film counterparts. In spite of this, their basic perceptive of physico-chemical properties are however controversial to the scientific society. In this review article, we present the deep insight into all the reported protocols available for the synthesis of purely inorganic as well as hybrid halide perovskites (incorporating organic as well as inorganic cation) to achieve high-quality single crystals. On account of advanced characteristics like long carrier recombination lifetime and exciton diffusion length, wide-ranging visible to NIR absorption, high charge mobility, controllable optoelectronic properties etc., hybrid halide perovskites have emerged to be a tough challenger in the optoelectronic research area in comparison to the purely inorganic halide perovskites and have consequently been paid much attention. Therefore, the optoelectronic properties and convenient applications of particularly hybrid halide single-crystal perovskites in various optoelectronic devices like solar cell, laser, high energy ray detector, photodetector, light-emitting diode, etc are highlighted