{"id":17364,"date":"2017-12-04T09:27:01","date_gmt":"2017-12-04T08:27:01","guid":{"rendered":"https:\/\/www.zerodonto.com\/en\/?p=17364"},"modified":"2017-12-04T17:42:37","modified_gmt":"2017-12-04T16:42:37","slug":"root-canal-shaping-expansion-endoshaper-endofinisher","status":"publish","type":"post","link":"https:\/\/www.zerodonto.com\/en\/2017\/12\/root-canal-shaping-expansion-endoshaper-endofinisher\/","title":{"rendered":"Root canal shaping with latest generation expanding instruments"},"content":{"rendered":"

INTRODUCTION<\/span><\/h2>\n

The need to shape a root canal\u00a0 <\/span>root canal thoroughly is surely the primary purpose of any proper endodontic treatment. <\/span><\/p>\n

Only by removing the canal content (whether organic or not) irrigants are able to carry out their action,\u00a0 <\/span>allowing the sealer \u00a0 <\/span>and the filling materials to seal the endodont.<\/span><\/p>\n

For this purpose, different instrumentation methods have been developed over the years, making\u00a0 <\/span>use of higher and higher performance\u00a0 <\/span>materials; however,\u00a0 <\/span>studies\u00a0 <\/span>carried out so far,\u00a0 <\/span>by using Micro-Ct, have shown that an endodontic area, up to 70%, depending on the root canal anatomy\u00a0 <\/span>and the root canal section examined,\u00a0 <\/span>is left untreated, i.e. uncleaned. (Fig 1-2) [36,37]<\/span><\/p>\n

Instrumented Areas in Yellow<\/span> –\u00a0<\/span>Non-instrumented Areas\u00a0 <\/span>in Red<\/span><\/span><\/p>\n

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Clinical and product research has focused on problem solving by concentrating work in three direction<\/span><\/p>\n

1- Improving irrigation<\/span><\/p>\n

2- Creating new sealers<\/span><\/p>\n

3- Creating new alloys for instruments<\/span><\/p>\n

Irrigation and its issues associated with the various devices on the market were mentioned in a previous article on this blog<\/a>\u00a0[41] and (but), to date, there has been no further innovation, except for some studies on laser-assisted\u00a0 <\/span>techniques (PIPS) [42]. However, there are still doubts about their efficacy, especially if we take into account the cost-benefit ratio.<\/span><\/p>\n

As for As for new sealers (bioceramics), please refer to a further article that will deal with their characteristics and instructions for use.<\/span><\/p>\n

In this article, we are going\u00a0 <\/span>to describe the innovation brought to product research, regarding Ni-Ti instruments.<\/span><\/p>\n

Dealing with instruments and instrumentation, the most worrying issue is the risk of fracture to which they are subject. Unless we are dealing with native structural imperfections (creep fracture) [23], first of all,\u00a0 <\/span>we have to take into account the accumulation of cyclic fatigue to which the instruments are subject [24], and the torsional stress produced during cutting maneuvers.<\/span><\/p>\n