This study evaluated the efficacy of 2 types of rotary instruments employed in association with sodium hypochlorite (NaOCl) or EDTA in removing calcium hydroxide (CH) residues from root canals dentin walls. Forty-two mandibular human incisors were instrumented with the ProTaper System up to F2 instrument, irrigated with 2.5% NaOCl followed by 17% EDTA and filled with a CH intracanal dressing. A...

Fretting corrosion at the taper interface of modular hip implants has been implicated as a possible cause of implant failure. This study was set up to gain more insight in the taper mechanics that lead to fretting corrosion. The objectives of this study therefore were (1) to select experimental loading conditions to reproduce clinically relevant fretting corrosion features observed in retrieved...

Pain resulting from needle iniection is a serious problem forpatients hat self-administer medication at home. We studied impressions of needle use by comparing PenNeedleO 32G Taper (NovoFine@' 32G Tip), developed to reduce the sense of fear and pain of injection, with a conventiona] needle, in children self-injecting GH, A total of 34 patients self-injected themselves with needles coupled with ...

Stem taper data are usually hierarchical (several measurements per tree, and several trees per plot), making application of a multilevel mixed-effects modelling approach essential. However, correlation between trees in the same plot/stand has often been ignored in previous studies. Fitting and calibration of a variable-exponent stem taper function were conducted using data from 420 trees felled...

AIM To introduce the concept of variable taper instruments for predictable and ergonomic root canal preparation, and demonstrate the design features of Greater Taper files. SUMMARY Optimal root canal shaping is difficult to practice and teach with traditional instruments. Instrument sequences are complex, with up to 18 instruments and 63 procedural stages, providing almost limitless scope for...

Background The poor hygiene of peri-implant tissues causes inflammation at tissue-implant interface, which may impair the rehabilitation success. The aim of this study was to evaluate the influence of external hexagon and Morse taper implants on peri-implant health in patients wearing mandibular overdentures for 1 year. Materials and Methods A total of 46 implants were evaluated, 28 external ...

Of the three wings, the most strongly tapered λ = 0.2 wing will have by far the smallest tip deflection ratio δ/b. This is mostly due to its larger root chord giving a greater local stiffness, although its smaller root bending moment factor of 0.100 also contributes. Such inherent stiffness allows the strongly tapered wing to have a larger span than the others, giving it a potentially lower ind...

Attribute-specific mode choice models predict the distribution of traffic among the various modes available, on the basis of some attributes. We consider the effect on valuation of one important attribute of mode choice, namely the travel time, for a population of commuters, when wireless internet access (wi-fi) is provided on trains. We use activity demand models to derive certain parameters o...

The Morse-Smale complex is an important tool for global topological analysis in various problems in computational topology and data analysis. A certified algorithm for computing the Morse-Smale complexes has been presented for two-dimensional Morse-Smale systems in bounded planar domains [3]. In the current article we extend the approach in case of MorseSmale systems on two-dimensional manifold...