As compared with continuous rotary systems, reciprocating motion is believed to increase the fatigue resistance of NiTi instruments. We compared the cyclic fatigue and torsional resistance of reciprocating single-file systems and continuous rotary instrumentation systems in simulated root canals. Eighty instruments from the ProTaper Universal, WaveOne, MTwo, and Reciproc systems (n = 20) were s...

Condition monitoring data collection capabilities have grown over the last decade in large part due to advances in integrated circuits (IC). These advances now permit real time thermodynamic and process calculations on desktop computing platforms. With these capabilities, the sophistication and amount of data available to the users of rotating and reciprocating equipment has grown exponentially...

Objective: The aim of this study is to assess the effects of laser irradiation with a novel snoring handpiece on the histological structures of the soft palate in a rat model. Background: Snoring is a common problem in adults that affects between 20–50% of the population. The sound of snoring is usually a consequence of the vibration of pharyngeal soft tissue, and treatment aims to reduce these...

The purpose of this study was to evaluate how time-dependent waterline flushing affects the presence of biofilm in otherwise-untreated dental unit waterlines (DUWLs). Water samples were obtained from twelve highspeed handpiece DUWLs located in the undergraduate treatment clinic at the University of Missouri-Kansas City, School of Dentistry. Baseline water samples (50 cc) were collected prior to...

High speed instruments are versatile instruments used by clinicians of all specialties of dentistry. It is important for clinicians to understand the types of high speed handpieces available and the mechanism of working. The centers for disease control and prevention have issued guidelines time and again for disinfection and sterilization of high speed handpieces. This article presents the rece...

introduction: this study investigated the influence of erbium-doped yttrium aluminum garnet (er:yag) laser on microhardness, chemical composition and subsurface morphology of dentin cavity walls. methods: forty sound human premolars were selected and randomly assigned into four groups. class v cavities were prepared either with an er:yag laser (groups 1 and 2; 15 hz, 250 mj for enamel, 10 hz, 2...