Premium
Dentine‐removing characteristics of K‐files energized by the Piezon‐Endo
Author(s) -
BRIGGS P. F. A.,
GULABIVALA K.,
SETCIIELL D. J.
Publication year - 1992
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.1992.tb00942.x
Subject(s) - endodontics , materials science , crest , dentistry , optics , physics , medicine
Summary This in‐vitro study evaluated the pattern of dentine removal when a size 25 K‐file energized by the Piezon‐Endo was applied to flat surfaces of dentine under standardized conditiuons. The effects of power setting, interfacial force between file and dentine, direction of file oscillation and operator‐assisted movement were examined. Vinyl polysiloxane impressions of the instrumented surfaces revealed characteristic patterns consisting of a series of oblique crests, similar to those observed in a previous study using the Cavi‐Endo. Each crest was parallel to the next and separated by a relatively constant distance. These crests were disposed along the line of contact with the file. The Reflex microscope was used to determine the height width and separation of these crests. There were differences in the amount and pattern of dentine removal comparecd with the study on the Cavi‐Endo. When the file was held against the dentine surface using the minimum power setting and an interfacial force of 30 g, the pattern of dentine removal was very similar to that produced by the Carvi‐Endo. Increasing the power setting to the maximum recommended for endodontics produced a slight but statistically non‐significant increase in dentine removal. Further increase of the power setting to the absolute maximum produced significantly deeper and wider areas of dentine removal by the apical part of the file. In marked contrast to the Cavi‐Endo, increasing the interfacial force from 30 to 60 g resulted in a significantly greater amount of dentine removal by the coronal part of the file, but there was no reduction in the effect of the apical part of the file. The superimposition of operator‐induced movement of the file greatly increased the amount of dentine removal as demonstrated by the coalescence of crests to form deep grooves. The grooves tapered relatively evenly, except apically, where the taper increased and the grooves terminated in a point. The crestal pattern would be observed to a variable degree on some of the specimens. The total amount of dentine removed in the ‘operator‐assisted’ groups appeared to be much greater than that in the Cavi‐Endo study.