October 2003 ORAL HEALTH 75 T he ‘Apical Control Zone’ is a matrix-like region created in the apical third of the root canal space. The zone demonstrates an exaggerated taper from the clinician defined apical constriction whether this is spatially a linear or point determination. This enhanced taper in the apical control zone provides resistance form against the condensation pressures of obtura...

A novel hybrid fiber taper is proposed and demonstrated as the coupler in a microsphere laser system. The pump wave and the laser emission, respectively, are more efficiently coupled to and from the sphere modes with this taper structure. A 980-nm pumped erbium-ytterbium codoped phosphate microsphere laser is demonstrated in the 1550-nm band. As much as 112microW of single-frequency laser outpu...

Abstract Background Restoration with locking-taper implants is a widely used methodology. However, conical connection systems such as implant have rarely been examined. This study provides retrospective investigation of fixed restorations, mainly focusing on prosthetic complications. Methods Patients undergo treatment connected from 2008 to 2010 were Preparation the sites was performed accordin...

For a fiber optical surface plasmon resonance (SPR) sensor a short part of its cladding should be removed to coat a thin layer of a metal. Usually this is problematic when an optical fiber with small core diameter is used. In this paper, a new method using µliter droplet of the HF acid for short fiber optical taper fabrication is reported. Using this method in a multi-mode optical fiber w...

In this paper, the mathematical model of the modified step-theory is derived based on the platform of two-dimensional photonic crystal structure that is infinitely long in third dimension. The mode coupling mechanism of photonic crystal tapers is theoretically studied using the modified step-theory. The model is verified by comparing the transmission spectrum obtained for the input/output defec...

OBJECTIVE To determine hearing recovery in patients with idiopathic sudden hearing loss treated with varying amounts of oral steroids. STUDY DESIGN AND SETTING A retrospective chart review (n = 75) in a tertiary care clinic examined sudden hearing loss patients treated with 1 60-mg prednisone taper, 1 course of steroid less than a 60-mg taper, or any 2 courses of oral steroid. RESULTS Overa...

Taper corrosion of the head-neck junction is a potentially significant and devastating problem facing orthopedic surgeons. We present a case of a 53 year old male who presented for routine follow up for a left, large head, metal on metal total hip arthroplasty five years out. The patient was asymptomatic at the visit. X-rays at the time demonstrated a large amount of medial calcar osteolysis. S...

XX There are enormous differences in opinion regarding the potential to three-dimensionally clean a root canal system. Elimination of pulpal tissue, bacteria when present, and their related breakdown products is directly influenced by a series of procedural steps that comprise start-to-finish endodontics. Regrettably, there is no single beacon of light to brightly illuminate the most proven cli...

A small depression is created in a straight optical fiber taper to form a local probe suitable for studying closely spaced, planar microphotonic devices. The tension of the "dimpled" taper controls the probe-sample interaction length and the level of noise present during coupling measurements. Practical demonstrations with high-Q silicon microcavities include testing a dense array of undercut m...