Ex vivo shaping ability of reciprocating instruments operated by new users: Reciproc versus WaveOne
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ORIGINAL ARTICLE
Ex vivo shaping ability of reciprocating instruments operated by new users: Reciproc versus WaveOne Mary S. H. Lam 1 & Jeffrey W. W. Chang 2 & Gary S. P. Cheung 2 Received: 11 May 2020 / Accepted: 15 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Objectives To compare two reciprocating NiTi systems operated by novices for use in curved root canals. Methods Fifty mesial roots of extracted mandibular first molars, with 2-2 canal configuration, were scanned with micro-CT and divided into 2 groups according to canal length and curvature: Reciproc and WaveOne. Each system was used to prepare one of the two canals by fourth-year dental students, who were new to reciprocating files and were blinded to the system being used. After another scanning, the pre- and post-instrumentation images were compared 3-dimensionally in software. Results Some 43 to 46% of the canal wall area remained un-instrumented. Significantly higher proportions of canals were transported towards the isthmus or furcation aspect than the mesial or external aspect. Mean transported distance was the greatest in the coronal one-third. Remaining dentine wall was the thinnest at the furcal aspect near the middle root region. No significant difference was noted between the two brands in the parameters examined. Conclusions Both brands of reciprocating file left similar amounts of un-instrumented canal wall, and resulted in similar extent of canal transportation. Clinical relevance NiTi reciprocating files can safely be used by new users to prepare curved root canals into a predictable shape. Keywords Dental education . Micro-CT . Nickel-titanium . Root canal preparation . endodontic instrument
Introduction One of the “technical” or mechanical aims of root canal preparation is to maintain the original shape and curvature of the root canal. The canal should be enlarged to an appropriate size to allow effective irrigation and placement of intracanal medicament and, later, the obturation material. This procedure is essential to facilitate the biological aim of treatment, namely, to remove bacteria from the root canal system to encourage healing of the periapical tissues. Traditional use of stainless steel files has been reported to Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00784-020-03593-x) contains supplementary material, which is available to authorized users. * Gary S. P. Cheung [email protected] 1
Department of Health, The Government of Hong Kong SAR, Hong Kong, Hong Kong
2
Division of Restorative Dental Sciences, Faculty of Dentistry, University of Hong Kong, PPDH, 34 Hospital Road, Pokfulam, Hong KongSAR
result in canal aberrations [1], including ledge formation, straightening and transportation of the curved root canals. Nickel-titanium (NiTi) instruments appear to be highly promising in producing a predictable shape with a reduced risk of causing canal aberrations [2]. Healing of periapical lesions has been shown to be enhanced with the use o
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