In vitro study of calcium hydroxide paste removal from oval canals with iRace and XP-endo Finisher systems

Abstract

INTRODUCTION: Cleaning and shaping of the root canal is one of the most important stages in endodontic
treatment, that is difficult to reach in oval root canals because the files can not reach some parts of the canal
during treatment. The XP-endo Finisher file (FKG-Dentaire, La-Chaux-de-Fonds, Switzerland) is a Nickel
Titanium instrument with Max Wire, that allows the file to expand into the root canal, at 37° body
temperature, to reach to difficult areas. It is a supplementary instrument that should be used after root canal
instrumentation.
OBJECTIVE: To evaluate the removal of calcium hydroxide paste [Ca (OH)2] from canine oval root canals
using the iRace mechanized instrumentation system and the XP- endo Finisher supplementary instrument,
through a radiographic study.
MATERIAL AND METHODS: 10 extracted human canines were selected. The root canals were
instrumented and filled with calcium hydroxide, iodoform and distilled water paste. Orthoradial and
proximal radiographs (RX1) were taken. After 7 days, the filling material was removed using iRace system
15/.06, 25/.05 and 30/.04, by irrigating each instrument change with sodium hypochlororite. Orthoradial
and proximal radiographs (RX2) were taken. Subsequently, the XP- endo Finisher supplementary
instrument was used during 1 minute, into an incubator box at 37°. Final orthoradial and proximal
radiographs (RX3) were taken. The radiographs 1, 2, and 3 were evaluated with Image Pro Plus Software
v6.0. Data was evaluated by Analysis of Variance with Repeated Measures (ANOVA-MR). For all cases
the significance level was p<0,05.
RESULTS: Instrumentation with iRace system removed 50,8% calcium hydroxide paste from the root canal
and the use of suplementary file XP-endo Finisher removed 92,3%. The difference was statistical significant
(p<0,05).
CONCLUSIONS: The use of XP-endo Finisher supplementary instrument increased the remotion of
Ca(OH)2 paste from oval root canals.