Comparison of the Time Required to Create Secondary Fracture of Separated File Fragments by Using Ultrasonic Vibration under Various Canal Conditions

Terauchi, Yoshitsugu; O’Leary, Le; Yoshioka, Takatomo; Suda, Hiroshi

doi:10.1016/j.joen.2013.06.021

Cited by 13 publications

(19 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During this process, the ultrasonic tips should move in the reverse direction of rotation to that of the instrument. It has been suggested that the use of citric acid or EDTA combined with ultrasonics, can help the removal of debris and smear layer from the grooves of the instrument and thus facilitate the fragment removal from the root canal 45,46 .…”

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

“…In order to reduce the possibility of secondary instrument separation, a modified removal technique with ultrasonics has been suggested 46 : The ultrasonic tip works in the inner surface of the curvature of the root canal, avoiding the outer surface of the curvature, so as to maintain the dentin wall that supports the fragment. The detachment of the fragment is assisted by the use of EDTA.…”

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

“…The detachment of the fragment is assisted by the use of EDTA. The removal of dentin from the inner surface of the curvature ceases when there is a danger of perforation or excessive weakening of the tooth 46 . Although this technique is deemed interesting, it is relatively dangerous.…”

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

“…In vitro studies have shown the rate of secondary instrument separation to be low: 1.1% 58 and 3.3% 59 . Terauchi et al 46 found that fragments located in dentin blocks separated in a shorter period of time when they were very curved and not supported by a dentin wall. The researchers suggest that the most likely causes of a secondary separation of a separated fragment are the following: a) the instrument that broke inside a curvature is subject to internal pressure and the use of ultrasonics adds further fatigue leading to further separation, b) the use of ultrasonics increases the temperature of the internal root canal surface considerably; much more than it does at the external root canal surface.…”

Section: Secondary Separation Of the Fragmentmentioning

confidence: 99%

“…The researchers suggest that the most likely causes of a secondary separation of a separated fragment are the following: a) the instrument that broke inside a curvature is subject to internal pressure and the use of ultrasonics adds further fatigue leading to further separation, b) the use of ultrasonics increases the temperature of the internal root canal surface considerably; much more than it does at the external root canal surface. As a result, the flexibility of the instrument is reduced and its separation becomes more likely 46 .…”

Section: Secondary Separation Of the Fragmentmentioning

confidence: 99%

See 4 more Smart Citations

Separated instrument in endodontics: Frequency, treatment and prognosis

Vouzara¹,

Chares²,

Lyroudia³

2018

Balkan J Dent Med

View full text Add to dashboard Cite

SummaryInstrument separation during endodontic therapy is a frequent accident with rotary instruments being more likely to separate than manual ones. The treatment of cases with a separated instrument can be either conservative or surgical. A conservative approach involves the following treatment choices: a) bypass of the fragment, b) removal of the fragment, c) instrumentation and obturation coronally to the fragment. Concerning the removal of a separated instrument, a variety of techniques and systems have been developed. Ultrasonics, in combination with the operative microscope constitute the most effective and reliable tools for removing a separated endodontic instrument from a root canal. The likelihood of successful removal depends on: the level of separation (coronal, middle or apical third); location in relation to the root canal curvature; the type of separated instrument; its length; the degree of canal curvature and the tooth type. Several complications may occur during the management of a separated instrument: separation of the ultrasonic tip or file used for bypassing or removing the instrument; further separation of the fragment; perforation; ledge; extrusion of the file into periapical tissues; tooth weakening due to dentin removal, as well as excessive temperature rise in periodontal tissues. Prognosis for a tooth retaining a separated instrument depends on the presence of a periapical lesion, the microbial load of the root canal during the time of separation and the quality of the obturation.

show abstract

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

Section: Techniques and Methods Of Endodontic Treatment In Cases Withmentioning

confidence: 99%

Section: Secondary Separation Of the Fragmentmentioning

confidence: 99%

Section: Secondary Separation Of the Fragmentmentioning

confidence: 99%

See 3 more Smart Citations