Abstract
Brushing motion has been proposed for endodontic single-file reciprocating systems to eliminate coronal interferences, but it may hesitate in a less conservative root canal shaping. The aim of the study was to compare the maintenance of the original root canal anatomy using the WaveOne Gold (WOG) technique with or without a brushing motion. Sixty extracted human mandibular first molars were selected. Manual canal scouting and mechanical glide path were performed. Samples were randomized into two groups (n = 30): WOG Primary was used to shape the mesio-lingual canals without (NB group) or with (B group) an intentional brushing motion. Specimens were scanned with micro-computed tomography (micro-CT) before and after instrumentation in order to match the volumes. Increases in canal volume and surface area were measured. Centroid shift and thickness of removed dentine from the inner curvature were assessed at the furcation, 1.5 mm and 3 mm apically from the furcation, and in relation to the point of maximum curvature. Data were analyzed by one-way ANOVA and post-hoc Student–Newmann–Keuls tests (p < 0.05). No brushing technique resulted in being significantly associated with a better maintenance of the canal anatomy, especially in the coronal third (p < 0.05). When using the WOG system, a no-brushing technique resulted in less invasive shaping, reducing the risk of stripping.
Highlights
Root canal shaping is essential to achieve optimal results in the subsequent cleaning and filling procedures [1,2]
The aim of this study was to evaluate the ability of reciprocating WaveOne Gold single files to maintain the original root canal anatomy when used with or without an intentional brushing motion
It may be especially useful for the mesial canals of mandibular molars where it is intentionally directed against the outer side of the curvature where the dentine is thicker
Summary
Root canal shaping is essential to achieve optimal results in the subsequent cleaning and filling procedures [1,2]. This process aims to create an adequate space for irrigation while preserving the original anatomy [3]. Maintaining the original canal shape through the use of a minimally invasive technique is associated with better endodontic outcomes [1,4,5]. Nickel–titanium (NiTi) rotary systems have been shown to reduce shaping time, operator fatigue, and root canal transportation [6,7].
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