AI Article Synopsis
- The proposed method enhances preparation of challenging S-shaped root canals by modifying existing techniques for better control.
- It introduces a new formula to determine insertion depths for rotary instruments, focusing on preserving dental structure while avoiding overflaring.
- A case report demonstrates the technique's effectiveness in managing a specific dental issue, aiming for reduced instrumentation time and improved safety.
Article Abstract
The preparation of severely curved S-shaped double-curved root canals can be technically challenging. A novel root canal instrumentation technique is proposed, which modifies 2 techniques: the McSpadden crown-down technique and the tactile controlled activation technique. In the McSpadden crown-down technique, the root canal is divided into 2 portions: the coronal zone and the apical zone. However, rather than focusing on the length of file engagement, a formula is proposed to calculate the maximum insertion depths of higher tapered instruments to prevent overflaring of the canal and preserve pericervical dentin. Tactile-controlled activation involves activating martensitic nickel-titanium rotary files upon engagement and then immediately withdrawing the files. The proposed technique recommends 3 apical strokes after the initial engagement before withdrawal to minimize instrumentation time. This novel technique is described in a case report involving the management of an S-shaped double-curved maxillary lateral incisor. The technique presents a new method of crown-down instrumentation that prevents overflaring and avoids instrument separation.
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| http://dx.doi.org/10.1016/j.joen.2020.12.013 | DOI Listing |
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