perforations


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perforations

[‚pər·fə′rā·shənz]
(graphic arts)
Small rectangular sprocket holes along the edge of film.
(petroleum engineering)
Downwell holes made in well tubing, usually by shot-and-explosive or shaped-charge techniques; used for oil or gas production from desired horizons, or for injection of acidizing or fracturing fluids into the formation at predetermined depths.
References in periodicals archive ?
In the cases of refractory corneal ulcer and melting, subsequent corneal perforation usually happens despite intensive nonsurgical treatments.
We wish to highlight the relationship between the site of tympanic membrane (TM) perforation and the degree of hearing loss.
A second esophagogastroduodenoscopy confirmed an esophageal perforation.
Perforation of the eardrum was much more common in the age before antibiotic drugs became widely available.
Perforations were managed successfully with primary closure after maintaining the anterior chamber with viscoelastic substance.
In conclusion, root perforations are severe complications which affect the prognosis of endodontic procedures.
Several complications including disconnection and/or occlusion of the tube, shunt infection, intestinal obstruction, migration of the shunt, and perforation of the internal organs have been reported in association with the VP shunt.
Exploration of all of the hollow organs showed no signs of perforation or signs of inflammatory reaction.
Perforation of an MD by foreign bodies is an extremely rare cause of acute abdomen in children.
CHICAGO -- Uterine perforation rates are low for both the levonorgestrel intrauterine device and copper devices, and do not differ significantly between the two, according to the multinational EURAS-IUD study of more than 61,400 women.
Out of the 5260 PNL procedures, colonic perforation occurred in 11 patients (0.
We suggest that the perforations and string shots radiate mostly high frequency energy and detectability is controlled by attenuation of the media.