The efficacy of five instrumentation techniques for cleaning the apical third of curved root canals was assessed by histological examination. Mesial root canals of freshly extracted human mandibular molars were prepared by the following instrumentation methods: step-back technique using stainless steel files; step-back technique using nickel-titanium files; ultrasonic technique; balanced force ...

introduction: this study aimed to perform a rigorous sample standardization and also evaluate the preparation of mesiobuccal (mb) root canals of maxillary molars with severe curvatures using two single-file engine-driven systems (waveone with reciprocating motion and oneshape with rotary movement), using micro-computed tomography (micro-ct). methods and materials: ten mb roots with single canal...

Human movement is a “natural skill” employed to solve difficult problems in dynamics concerning the manipulation of a complex biomechanical system, the body, in an ever-changing environment. Continuous Interactive Simulation (CIS) is a technique that attempts to use this human capacity to solve problems in movement dynamics to solve problems concerning arbitrary dynamical systems. In this paper...

BACKGROUND There have been reports of serious complications associated with pedicle screw fixation, including nerve root injuries caused by accidental screw insertion. We have developed a new system of lumbar spinal instrumentation that we call Tadpole system. The purposes of this report were to show the results of a biomechanical study and the short-term outcome of a clinical study, as well as...

introduction: preparation techniques and instruments produce and push debris out of canals. this can induce inflammation within the periapical area. therefore, instrumentation that causes less extrusion of debris is more desirable. the purpose of this in vitro study was to evaluate the quantity of debris extruded from the apical foramen during root canal preparation by using one hand, and two r...

An instrumentation system is a measurement-based performance evaluation abstraction. Management of an instrumentation system becomes critical when tracing is enabled on an application program that runs for an excessively long period of time. This paper presents queuing models for two instrumentation system management policies, namely, Flush One when it Fills (FOF) and Flush All when One Fills (...

This paper models and evaluates the overheads of data collection components and services (called an instrumentation system) of Paradyn Parallel Performance Tools. An instrumentation system (IS) is an integral part of any measurementbased parallel tool to collect runtime information from concurrent processes. However, software instrumentation is known to be intrusive and likely to change the beh...

The prevailing view of motor cortex holds that motor cortical neural activity represents muscle or movement parameters. However, recent studies in non-human primates have shown that neural activity does not simply represent muscle or movement parameters; instead, its temporal structure is well-described by a dynamical system where activity during movement evolves lawfully from an initial pre-mo...

The part of (bio)mechanics that studies the interaction of forces on the human skeletal system and its effect on the resulting movement is called rigid body dynamics. Some basic concepts are presented: A mathematical formulation to describe human movement and how this relates on the mechanical loads acting on the skeletal system. These equations of motion depend on the mechanical properties of ...

Purpose. The authors tried to point out the crucial factors determining swimming results in a 2000m front crawl race. Basic procedures. Two groups of subjects: G1 (16.8 ± 0.77 years) and G2 (14.7 ± 0.49 years) of 15 swimmers each took part in two incremental tests for assessing aerobic endurance of arms in arm cranking (V̇O 2max AR) and of legs in cycling (V̇O 2max LG). The applied procedure made...