Damage to root dentin during retreatment procedures

H. Shemesh, A.C. Roeleveld, P.R. Wesselink, M.K. Wu

Research output: Contribution to JournalArticleAcademicpeer-review


Introduction: The aim of this study was to explore the
influence of retreatment procedures on the appearance
of defects on the root canal walls. Methods: Two
hundred mandibular premolars were divided into 4
groups. One group was left unprepared. The rest of
the teeth were prepared with ProTaper files up to size
F4 and filled with gutta-percha and AH26. One group
was left filled and received no further treatments. The
filling material was removed from the remaining teeth
either with ProTaper retreatment files or with Hedstr€om
files. Roots were then sectioned and inspected under
a microscope. Data were analyzed with the nominal
regression test (a = 0.05). Results: No defects were
observed in the unprepared group. Retreatment groups
showed significantly more defects than the initial treatment
group (P < .05).There was no difference between
the appearance of defects after retreatment with
Hedstr€om files and ProTaper retreatment files. The remaining
dentin thickness and level of the root did not
significantly influence the appearance of defects.
Conclusions: Retreatment procedures result in more
defects than initial treatment. When assessing the
outcomes of endodontic retreatment, the substantial
damage to the root canal walls should be considered.
Original languageEnglish
Pages (from-to)63-66
JournalThe Journal of Endodontics
Issue number1
Publication statusPublished - 2011


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