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Open AccessArticle

Residual Endodontic Filling Material after Post Space Preparation: A Confocal Microscopic Study

School of Dentistry, The University of Queensland, Herston, Brisbane QLD 4006, Australia
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Materials 2017, 10(11), 1333; https://doi.org/10.3390/ma10111333
Received: 13 September 2017 / Revised: 9 November 2017 / Accepted: 16 November 2017 / Published: 21 November 2017
(This article belongs to the Special Issue Dental Biomaterials 2017)
This laboratory study assessed removability of endodontic alkaline cements and resin sealers using coronal cross-sectional slices of roots with single canals. Materials were labelled with 0.1% (w/w) sodium fluorescein prior to mixing so that confocal microscopy could be used to quantify material remaining on the walls of post spaces, to assess cleanliness. Roots of extracted teeth were prepared using rotary NiTi instruments then obturated using lateral condensation with gutta percha and epoxy resin sealers (AH-Plus™ or Zirmix™), or were filled by injecting mineral trioxide aggregate (MTA) cement (GC Nex™ MTA or MTAmix™) or a hard-setting calcium hydroxide cement (Supercal™). Brown (#3) ParaPost™ drills were used at 600 rpm with a torque setting of 3 N cm−1 for 2 min to remove 5 mm of the root filling. Roots were embedded and coronal slices examined by confocal microscopy, with the perimeter of the drill channel divided into clean, unclean and non-accessible regions. The choice of material affects cleanliness, with MTA being the most difficult and calcium hydroxide cement the easiest to remove. With epoxy resin-based sealers, almost half of the accessible canal walls remained coated with remnants of sealer after post space preparation. View Full-Text
Keywords: sealer; cement; post space preparation; confocal microscopy; MTA; calcium hydroxide sealer; cement; post space preparation; confocal microscopy; MTA; calcium hydroxide
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Teoh, Y.-Y.; Walsh, L.J. Residual Endodontic Filling Material after Post Space Preparation: A Confocal Microscopic Study. Materials 2017, 10, 1333.

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