The failures of root canal preparation with hand ProTaper

The failures of root canal preparation are due to some anatomical deviation (canal in "C" or "S") and some technique errors. The technique errors are usually present in canal root cleansing and shaping stage and are the result of endodontic treatment objectives deviation.

OBJECTIVES

Our study was made on technique errors while preparing the canal roots with hand ProTaper.

METHODOLOGY

Our study was made "in vitro" on 84 extracted teeth (molars, premolars, incisors and canines). The canal root of these teeth were cleansed and shaped with hand ProTaper by crown-down technique and canal irrigation with NaOCl(2,5%). The dental preparation control was made by X-ray.

RESULTS

During canal root preparation some failures were observed like: canal root overinstrumentation, zipping and stripping phenomenon, discarded and/or fractured instruments.

CONCLUSIONS

Hand ProTaper represents a revolutionary progress of endodontic treatment, but a deviation from accepted rules of canal root instrumentation can lead to failures of endodontic treatment.

Whitening non vital teeth - a case report

Commonly used in cosmetic dentistry teeth whitening can be used combined with other restorative techniques during dental treatment. Non-vital teeth whitening is necessary whenever we need an improvement of their aspect, as it's a known fact that these teeth can have a grey or pink-grey coloration when they are not correctly endodontical treated.

[An immunofluorescence study of the viral and inframicrobial flora of the pharynx in 0- to 5-year-old children with acute respiratory diseases]

The pharynx viral and inframicrobial flora of 52 0-5-year-old children with acute respiratory diseases was investigated through the immunofluorescence techniques. Results showed a high positivity rate (91% to 95%), the simultaneous presence in most of the patients of two to five antigens and the dominance of parainfluenza type 3 virus. The significance of the pharyngeal flora is discussed from an immunologic point of view.