mechanics have been devised for the eruption of impeded and impacted teeth. One such device, the Monkey Hook,* was recently introduced as a method of applying lateral and vertical eruptive forces.1 The Kilroy Spring* is a new option that produces directional forces without the need for special patient compliance. The Kilroy Spring is a constant force module that is slid onto a rectangular archw...

In the spring of 1912 one of the largest moving objects ever created by human beings left Southampton and began gliding toward New York. It was the epitome of its industrial age -a potent representation of technology, prosperity, luxury, and progress. It weighed 66,000 tons. Its steel hull stretched the length of four city blocks. Each of its steam engines was the size of a townhouse. And it wa...

the current study assesses the root causes of hydrogen blisters on low strength carbon steel equipment. for this purpose, some experiments including hardness test, non-destructive test (ndt), metallography, and fractograpghy are conducted. the microstructure of two blisters is assessed by means of optical microscopy and scanning electron microscopy (sem). the microstructural studies show that t...

Tlre preserrce oflrarrl corrtarnir~rrrIt.s in lubricated rolling bearing.~ is (I rrrrijor cr1~1.s~ of /~rel~rrrti~re failure, for exarnple by fatigue or I J ~ rrbr(r.sive rt~erlr of rolling el en rent.^, races or cages. However; tlre brtrotluctiorr of rtruclr Irorcler ceranzic (u.sually silicon nitride) balls or r01ler.s rurrrrirrg rlgnirzst steel races, in tlre lzybrid bearing concept, is like...

Diamond-like carbon (DLC) and silicon carbide (SiC) coatings are attractive because of low friction coefficient, high hardness, chemical inertness and smooth finish, which they provide to biomedical devices. Silicon wafers (Si(waf)) and silicone rubber (Si(rub)) plates were coated using plasma-enhanced chemical vapour deposition (PE-CVD) techniques. This article describes: 1- the characterizati...