This system was introduced in 2011 by the Dentsply/Maillefer Company (Ballaigues, Switzerland), and consists of three single-use files, including small (ISO 21 6%), primary (ISO 25 8%), and large (ISO 40 8%). This type of movement prevents file breakage and increases its resistance to both cyclic and torsional fatigue.Īnother competitive single file NiTi reciprocation system, WaveOne, has also been launched. One movement is counter-clock wise, which engages and cuts dentin, and the other is clock-wise, which disengages the file from the dentin to avoid taper lock and relieves stress on the file. This concept has many advantages over the conventional rotary NiTi systems: (1) greater time efficiency because it requires only a single file to prepare all the canals with no requirement for prior glide path preparation (2) single files are made from M-wire (heated NiTi alloy) that give them the greatest flexibility and cyclic fatigue resistance and (3) reciprocating systems, which move in rotating reciprocation movements (balanced force) with large rotating angles. SILVER) which was made in Munich, Germany. The single-file NITi system consists of three files, including the R25 (ISO 25 8%), R40 (ISO 40 6%), and R50 (ISO 50 5%) it has respective paper points and gutta-percha and a specific motor (VDW. He has also introduced the Reciproc system. This led to the revolution of single-file NiTi reciprocating systems, which has been adopted by Dr. In some cases, using NiTi files can also be time consuming because they may require multiple exchanges of file sizes some of these files need prior glide path preparation done with hand files. When rotating in curved canals, it may lead to cyclic fatigue, which is file separation and fracture due to repeated tensile-compressive forces being applied to the file in maximum curved areas. However, as in many other systems, the NiTi rotary system appears to have some drawbacks. Most of the NiTi rotary systems move in a continuous rotation. The NiTi alloy can regain its original shape (austenite) after the application of stress or heat (martensite) in a characteristic called the “shape memory effect.” This flexibility is due to the property of the NiTi alloy, which can undergo transformation between the austenitic and martensitic phases. This finding was later supported by others, and it was proven that NiTi superelasticity was an advantage in curved canals because it reduced forces on the walls, enhanced centering ability, and led to less iatrogenic errors. He reported that NiTi had greater elastic flexibility than stainless steel. introduced nickel–titanium (NiTi) files in endodontics. To overcome these difficulties, in 1988, Walia et al. This was because of their troublesome use when shaping curved canals and owing to several disadvantages, including both rigidity that may cause many iatrogenic errors (transportations, ledges, and zipping) and the tendency to result in lengthy root canal treatment procedures. These hand files were replaced by rotary systems. The use of stainless steel hand files and H and K-files were the conventional shaping method. Evolution of endodontic shaping instruments has occurred over time, which has proven to be beneficial for maximizing debridement and decreasing procedural errors. Well-designed randomized clinical trials comparing both systems under the same experimental conditions should be done in future studies.Ĭanal shaping is an integral part of endodontic treatment because it removes bacteria and facilitates further successful irrigation and obturation. However, with regard to other parameters, mixed results were obtained. In conclusion, our study supports the finding that Reciproc is more resistant to cyclic fatigue than WaveOne. This difference was statistically significantly at P value < 0.001. The pooled difference in mean time to fracture was longer for the Reciproc system by 45.6 sec. The time to fracture for the Reciproc and WaveOne systems ranged from 119.7 sec to 156.4 sec and 74.8 sec to 99.6 sec, respectively. Twenty-six studies were qualified for the systematic review, and only three studies were considered for the meta-analysis using cyclic fatigue resistance as the main parameter. Inclusion and exclusion criteria were then established. A comprehensive electronic literature search for Reciproc and WaveOne using PubMed and Google scholar was initially conducted in September 2014 and updated in September 2016. Thus, the aim of this study was to compare the available reciprocating systems, Reciproc and WaveOne, using a meta-analysis with different parameters. The introduction of single-file nickel-titanium (NiTi) reciprocating systems has been a major breakthrough in the field of endodontics.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |