ArticleBMC oral health2026
Removal of overextended root canal filling beyond the apex in lower premolar teeth using two different retreatment rotary files versus manual files: a comparative in vitro study.
Article in BMC oral health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe aim of the study was to compare the time required for complete removal of overextended root canal filling in lower premolar teeth using two different rotary file systems; ProTaper Universal Retreatment (PTUR) system, XP-endo Retreatment (XPER) system versus manual Hedstrom (H-Files).
methodsThirty-six extracted permanent mandibular premolars with single canal were set to a standard length of 19 mm and prepared beyond the apical foramen by 3 mm up to F2 file of the ProTaper Gold system. Overextended obturation was performed by a size (25/08) gutta-percha and AH-Plus sealer using cold lateral condensation technique. Teeth were left for 7 days to ensure complete setting of sealer, then divided into 3 groups (n = 12) according to the gutta-percha removal method (Group Ι: H-Files, Group ΙΙ: PTUR, Group ΙΙΙ: XPER (XP-endo Shaper (XPES) + XP-endo Finisher R (XPEF-R)). Time taken was recorded and statistically analyzed.
resultsThe XPER technique showed a statistically significant reduction in the time taken to remove the overextended gutta-percha compared to H-files and PTUR groups (P < .05), with the XPER group showing the shortest time, followed by PTUR, and then H-files.
conclusionsXPER technique was significantly faster in removing the experimentally overextended gutta-percha than H-files and PTUR files, demonstrating superior procedural time efficiency.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.