FAA air traffic control computer modernization [microform] : hearings before the Subcommittee on Transportation, Aviation, and Materials of the Committee on Science and Technology, U.S. House of Representatives, Ninety-seventh Congress, first session, June 16, 17, and 18, 1981.

"No. 12."

Historical sketch of the Middlesex Canal : with remarks for the consideration of the proprietors /

Includes proposed form to incorporate Middlesex Water Company.

The convention of drunkards : a satirical essay on intemperance ; to which are added, three speeches on the same subject ; an oration on the anniversary of American independence ; and, an ode on the completion of the Erie Canal /

Mode of access: Internet.

Report of the engineer appointed by the Commissioners of the Mayor and City Council of Baltimore, on the subject of the Maryland canal.

Signed: Isaac Trimble.

On the antiquity and invention of the lock canal of Exeter; in a letter from Philip Chilwell de la Garde, esq. to Sir Henry Ellis ... Read 11th January, 1838.

Mode of access: Internet.

Sketch of a tour in the highlands of Scotland; through Perthshire, Argyleshire, and Inverness-shire, in September and October, 1818: with some account of the Caledonian canal.

Goldsmiths'-Kress no. 22306.

The action of anthelmintics on parasites located outside of the alimentary canal /

"September 25, 1912."

Annual report of the Isthmian Canal Commission

Report year ends December 1, 1905-1906; June 30, 1907-1914

Pathological and practical observations on diseases of the alimentary canal, oesephagus, stomach, caecum and intestines.

Mode of access: Internet.

Plan of the Washington Canal : no. I /

Relief shown by shading. Depths shown by soundings.

[Map of part of the Washington Canal at the eastern end of the Mall, Washington D.C.].

Shows "Present direction of the Canal" and "New canal."

Plan of the town of Alexandria, D.C. with the environs : exhibiting the outlet of the Alexandria Canal, the shipping channel, wharves, Hunting Cr. &c. /

Relief shown by hachures. Depths shown by contours.

Effects of Nd : YAG and Er : YAG lasers on the sealing of root canal fillings

Objective: the ability of the laser irradiation to promote the cleaning and disinfection of the radicular canal system has become this type of treatment in a viable and real alternative in endodontics. The purpose of this study was to evaluate the apical marginal sealing of root canal fillings after the irradiation with the laser of Nd:YAG or of Er:YAG. Materials and Methods: Forty-two human, extracted single-rooted teeth had their crowns sectioned and the root canals prepared with a no. 70 K-file. Then, they were dried and divided into three groups according to canal wall treatment: group 1: the canals were filled with EDTA for 3 min, followed by irrigation with 1% sodium hypochlorite solution; group 2: the canal walls were irradiated with Nd:YAG laser; and group 3: the canal walls were irradiated with Er:YAG laser. Afterwards, the root canals were obturated by the lateral condensation technique. The roots were externally waterproof, except in the apical foramen and immerged in 2% methylene blue aqueous solution during 48 hours. Results: the results showed that the largest infiltrations happened in the group 3-Er:YAG (7.3 mm), proceeded by the group 1-EDTA (1.6 mm) and by the group 2-Nd:YAG (0.6 mm). The group Er:YAG differed statistically of the others (p < 0.05). Conclusion: It was concluded that the Er:YAG laser intracanal irradiation previously to the root canal filling must be used with caution until future research is define the best parameters for it's use.

Effectiveness of ProTaper retreatment system associated with organic solvents in the removal of root canal filling material

Aim: To evaluate the effectiveness of ProTaper universal retreatment system in the removal of root canal filling material with thermomechanical compaction, in comparison to manualmechanical technique, associated with orange oil or eucalyptol. Materials and methods: Forty extracted lower incisors were filled with thermomechanical compaction technique. After 3 years, the root canal filling was removed by: G1 - manualmechanical technique with orange oil; G2 - manual-mechanical technique with eucalyptol; G3 - ProTaper universal retreatment system with orange oil and G4 - ProTaper universal retreatment system with eucalyptol. In sequence, all root canals were instrumented to F5 instrument. The teeth were longitudinally grooved, images of buccal half were obtained in stereomicroscope and covered area by root canal filling material was measured using image tool software, in cervical, middle and apical radicular thirds. The results were subjected ANOVA and Tukey test (p = 0.05). Results: In all thirds, the manual-mechanical technique showed lower presence of root canal filling material on root canal dentin in comparison to ProTaper retreatment universal system, regardless of organic solvent used (p < 0.05). There is no difference between organic solvents in removal root canal filling material (p > 0.05). Conclusion: The ProTaper universal retreatment system showed lower effectiveness in removal root canal filling material than manual-mechanical technique, regardless of organic solvents (orange oil or eucalyptol oil) used. Clinical significance: Recently rotary instruments have been proposed to removal of root canal filling material. However, there are no studies evaluating its effectiveness in removal root canal filling material in association with orange oil or eucalyptol oil.

The antimicrobial effects of root canal irrigation and medication

The role of microorganisms in the development and maintenance of pulpal and periapical inflammation have been well documented. The success of root canal treatment largely depends on the elimination of microbial contamination from the root canal system. Although mechanical instrumentation of root canals can reduce bacterial population, effective elimination of bacteria cannot be achieved without the use of antimicrobial root canal irrigation and medication. This review will discuss the antimicrobial effects of the known root canal irrigants and medicaments and explore future developments in the field. © 2007 Mosby, Inc. All rights reserved.