Journal
JOURNAL OF ENDODONTICS
Volume 36, Issue 6, Pages 1068-1072Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.joen.2010.02.023
Keywords
Micro-computed tomography; nickel-titanium instruments; root canal preparation; self-adjusting file
Categories
Funding
- ReDent Nova
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Introduction: The aim of this part of an ongoing study was to describe the dentin removal ability of a novel nickel-titanium instrument, the self-adjusting file (SAF), by using micro computed tomography. Methods: Twenty maxillary incisors were scanned preoperatively at 20-mu m resolution and postoperatively after up to 6 minutes of preparation with an SAF with 1.5-mm or 2-mm diameter. SAFs were operated with continuous irrigation in a handpiece that provided an oscillating, in-and-out movement. Changes in canal volume compared with preoperative values as well as unprepared canal surface area were determined. Data were normally distributed and compared by analysis of variance and regression analyses. Results: Preoperatively canal volumes were statistically similar in both groups (9.86 +/- 3.97 mm(3) and 9.80 +/- 2.67 mm(3)). Volumes increased during preparation to 13.58 +/- 3.85 mm(3) (after 6 minutes with SAF 1.5 mm) and 16.43 +/- 3.64 mm(3) (after 5 minutes with SAF 2.0 mm), and overall canal shapes were adequate. Unprepared canal surface area decreased from 63.0% +/- 15.1% (2 minutes with SAF 1.5 mm) to 8.6% +/- 4.1% (5 minutes with SAF 2.0 mm). Conclusions: Preparation of straight root canals in maxillary anterior teeth left little canal surface uninstrumented after shaping with the SAF. The time-frame of clinical application will depend on the amount of desired dentin removal and done with an SAF selected on the basis of apical gauging. (J Endod 2010;36:1068-1072)
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