We present morphological and spectroscopic studies of the northwest rim of the supernova remnant RX J1713.7−3946 based on observations by the Chandra X-ray observatory. We found a complex network of nonthermal (synchrotron) X-ray filaments, as well as a ’void’ type structure – a dim region of a circular shape – in the northwest rim. It is remarkable that despite distinct brightness variations, ...

Cr-Tm-YAG, Cr-Tm-Ho-YAG, and Er-YAG lasers at 2.01 pm, 2.1 2pm, and 2.94 pm, resp., are compared regarding single-shot and high-repetition rate efficiency. The 2 pm lasers are intrinsically limited at higher operation temperatures, the Er-laser only shows thermal lensing. Th~n (3 mm) Tmand Ho-laser rods allow high repetition rates (30 Hz) and with increasing rod diameters pulse energies up to 1...

introduction: the aim of this study was to evaluate and compare the scanning electron microscope (sem) of indirect composite conditioned by erbium-doped yttrium aluminum garnet (er:yag) laser, neodymium-doped yttrium aluminium garnet (nd:yag) laserand carbon dioxide (co2) laser. methods: 18 indirect composite blocks (gc gradia da2, japan) with 15 × 10 × 10 mm dimensions were made. the bonding s...

Using a rabbit model we investigated the role of pigmentation of the ciliary body in obtaining ciliodestruction by neodymium-YAG transscleral cyclophotocoagulation. There was marked destruction of the ciliary body in pigmented rabbit eyes, but no histologic effect was observed in albino rabbit eyes. These findings suggest that pigmentation of the ciliary body is important for obtaining the desi...

BACKGROUND 28-43% of the patients develop posterior capsular thickening after extra capsular cataract surgery. Nd-YAG laser capsulatomy is a method of choice to treat this complication. METHOD We conducted a prospective clinical, randomized comparative study to evaluate the post YAG laser IOP rise in 54 patients at Ayub Teaching Hospital Complex. RESULT There were 43% male and 57% female pa...

Temporal compressions of optical pulses and pulse trains have been performed by the photon-echo process in Tm-doped YAG at 793 nm. Single-pulse temporal compression by almost a factor of 500 from 10 micros to 22 ns and pulse train compression by a factor of 14 from 5micros to 350 ns with a high-speed frequency-tunable external-cavity diode laser are demonstrated. It is suspected that significan...

introduction: smear layer (sl) is produced as a result of mechanical instrumentation of the canal(s). despite the controversies regarding its removal, the evidence-based trend has shifted towards removing and eliminating the sl. different methods have been used to remove the sl and the aim of this in vitro study was to evaluate the ability of 17% ethylenediaminetetraacetic acid (edta), 18% etid...

Introduction The Thulium fiber laser (TFL) is a new device that in contrast to the other solid-state YAG-based lasers takes different approach pulse formation allowing for two modes: QCW (quasi-continuous wave) function, TFL convenient soft tissue surgery and SP (Superpulsed) mode it highly effective lithotripsy. Thus, unlike thulium (Tm : YAG), can be used wide range of surgical procedures. Ma...

introduction: the aims of the present study were: [1] to evaluate whether erbium-doped: yttrium, aluminum and garnet (er: yag) laser could be a prophylactic methods against transient bacteremia during scaling and root planing (srp) [2] to confirm the efficacies of srp with er: yag laser by clinical and microbiologic evaluations. methods: twenty chronic periodontitis subjects were randomly treat...