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Effect of Reciprocating Systems and Working Lengths on Apical Microcrack Development: a micro-CT Study
Bruna Paloma de Oliveira1, Andréa Cruz Câmara1, Daniel Amancio Duarte2
1Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School, UFPE - Universidade Federal de Pernambuco, Recife, PE, Brazil.
Brazilian Dental Journal
|December 7, 2017
Summary
Single-file reciprocating systems like WaveOne Gold and Unicone do not create new apical microcracks during root canal preparation. Existing microcracks were observed, but no new ones formed, regardless of working length.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Apical microcracks can compromise endodontic treatment success.
- Reciprocating single-file systems are widely used for root canal preparation.
Purpose of the Study:
- To evaluate the impact of WaveOne Gold and Unicone systems on apical microcrack formation.
- To assess the influence of working length (at apical foramen vs. 1 mm short) on microcrack development.
Main Methods:
- Forty human mandibular incisors were prepared using WaveOne Gold or Unicone systems at two different working lengths.
- Micro-computed tomographic (micro-CT) imaging was used before and after preparation.
- Examiners analyzed cross-sections for the presence of apical microcracks.
Main Results:
- No new apical microcracks were detected after root canal preparation with either system.
- All observed microcracks were pre-existing before instrumentation.
- The number of microcracks remained unchanged post-preparation across all groups.
Conclusions:
- Root canal preparation with WaveOne Gold and Unicone systems does not induce new apical microcracks.
- Working length did not influence the formation of apical microcracks with these systems.
