Removal of Gutta-percha from Root Canals Using
the Self-Adjusting File
Kathelijn C. Voet, DDS, Min-Kai Wu, DMD, PhD, Paul R. Wesselink, DDS, PhD,
and Hagay Shemesh, DMD, PhD
Abstract
Introduction: The aim of this study was to compare
the percentage of the residual gutta-percha–occupied
area (PRGPA) in root canals after retreatment using Pro-
Taper retreatment files (Dentsply Maillefer, Ballaigues,
Switzerland) with or without the additional use of
Self-Adjusting Files (SAFs; ReDent-Nova, Ra’anana,
Israel). Methods: Root canals in 33 curved mesiobuccal
roots of the first maxillary molars were cleaned and
filled with gutta-percha and AH26 sealer (Dentsply De
Trey, Johnson City, TN). Retreatment instrumentation
was performed in 28 roots with ProTaper retreatment
files and Hedstr€om files. The Additional use of SAF
was performed in 14 of the 28 roots. Five roots were
not retreated. All roots were sectioned horizontally at
2, 4, and 6 mm from the apex. PRGPA was measured
at each section. Scores 1 through 5 were used to repre-
sent the increasing extent of PRGPA; score 1 was 0%,
and score 5 was >30%. The data were analyzed with
nonparametric tests. Results: Score 5 was recorded in
all sections from roots that were not retreated. In re-
treated roots, the scores for the group using SAF were
significantly lower than that without using SAF (P =
.045); however, scores were higher at 2 mm than at
other levels of the root regardless of whether the SAF
had been used (P = .03). Conclusions: The complete
removal of gutta-percha from the apical portion of
curved canals remains a challenge. The additional use
of SAF removed more gutta-percha than ProTaper alone.
(J Endod 2012;38:1004–1006)
Key Words
Gutta-percha, ProTaper, retreatment, Self-Adjusting File
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