Please activate JavaScript!
Please install Adobe Flash Player, click here for download
ePaper created 2016-11-22, 09:52:12 | version 1.38.0
| industry report role of the microscope 40 roots 4 2016 Introduction Thepurposeofpreparingoftherootcanalsystem is well understood and contemporary techniques involvetheuseofbothhandandrotaryinstruments usedinconjunctionwithanirrigationregime.How- ever, the complexity and variability of root canal morphology can make effective preparation very challenging, particularly in canals with irregular cross sections. Current techniques are not always completely effective and it has been well recognised that while some part of the root canal are over prepared with rotary instrumentation, other surfaces are not touched. One study concluded that at least 35 % of the surface area of canals had remained untouched byrotarypreparation(Petersetal.,2001). Inanother study the results were even worse, 60–80 % un- treated surfaces were left in the distal canals of lowermolars,with65–75 %intheapical4 mmafter preparation(Paqueetal.,2010).Ovalcanalsarepar- ticularly challenging as the debris collects in the extensions and in isthmuses (Figs. 1a & b). A review of preparation techniques states that “because of limited efficacy of irrigation in such recesses, debris and smear layer may accumulate and remain on these unprepared root canals walls, decrease the quality of obturation and jeopardise thelong-termtreatmentsuccess”(Hulsmannetal., 2005). Fig.1a: Debris left after root treatment of distal canal of a lower molar. Fig.1b: Radiograph of failed root canal treatment shown in Fig.1a. The role of the operating microscope in conjunction with ultrasonic in preparation of root canal systems Author: Dr Anthony C. S. Druttman, UK Fig.1a Fig.1b 42016