Utilizing the Soret effect, we have employed a moderately focused laser beam (30 microm, 20 mW) to write spatial composition patterns into layers of the critical polymer blend poly(dimethyl siloxane)/poly(ethyl-methyl siloxane) (PDMS/PEMS, M(w)=16.4/22.8 kg/mol) both in the one- and in the two-phase region a few degrees above and below the critical temperature T(c)=37.7 degrees C. Because of th...

bovine oocytes matured in culture were denuded from cumulus cells with hyaluronidase and by repeat pipetting trough a fine pasture pipete and were inseminated with frozen-thawed spermatozoa in a protein-free bo medium containing 5m m-caffeine, l0 mg heparin/ml and with or without polyvinyl pyrrolidone (pvp) and different concentrations of hyaluronic acid. when oocytes were inseminated in the ab...

statement of the problem: the survival of pulpless teeth restored with different post and core systems is still a controversial issue. purpose: this study compared the retention of two different post and core systems and also the fracture resistance of teeth restored with these systems. material and method: eighty endodontically treated maxillary central incisors were sectioned perpendicular to...

Investigations of the effect of the excitation light wavelength on the intensity distribution in the fluorescence band of l,4-diphenyl-l,3-butadiene (DPB) in polyvinyl alcohol) films (PVA) at 296 and 87 K for samples before and after heating to 423 K, and fluorescence lifetime measurements have shown that trans-trans and cis-trans conformers are responsible for the emission of fluorescence. The...

Macroscopic designs of dried cow dung loaded polydimethyl siloxane (PDMS) composite for broadband microwave absorption is explored in this study.

OBJECTIVE The aim of this study was to evaluate the clinical performance of a glass ionomer restorative system compared with a microfilled hybrid posterior composite in a four-year randomized clinical trial. METHODS A total of 140 (80 Class 1 and 60 Class 2) lesions in 59 patients were either restored with a glass ionomer restorative system (Equia, GC, Tokyo, Japan), which was a combination o...

STATEMENT OF THE PROBLEM The survival of pulpless teeth restored with different post and core systems is still a controversial issue. PURPOSE This study compared the retention of two different post and core systems and also the fracture resistance of teeth restored with these systems. MATERIAL AND METHOD Eighty endodontically treated maxillary central incisors were sectioned perpendicular t...

Figure 1. Marked soft tissue irritation in retromylohyoid area with calcium hydroxide paste. The most critical time in the success or failure of a denture is the adjustment period, and the most common complaint is pain caused by soft tissue irritation. The clinician is responsible for the care of the patient throughout this period; however, detecting and transferring the irritated area to the d...

Abstract Structural control of siloxane-based materials at multiple length scales is important for various applications. In this study, we report the controlled assembly cage oligosiloxane building blocks by both intermolecular hydrogen bonding and hydrophobic interactions. A siloxane molecule modified with seven dimethylsilanol groups an octadecyldimethylsilyl group was synthesized stepwise si...