ROOT ELEVATORS NES-864

Fig. 4
The NES-864 extends the Kopp lower-root lineup with a 4.2 mm tip, built for situations where the 3.6 mm size in the same series does not offer enough surface contact. Among root elevator instruments made for the mandibular arch, this wider tip is suited to larger root diameters, particularly in the molar region where roots tend to be broader and bone density is at its highest.
A wider working end changes how force is distributed during elevation. Instead of concentrating pressure on a narrow point, the 4.2 mm tip spreads it across more of the root surface, which can reduce the tendency to slip or dig into cortical bone when working against firm mandibular structure. This makes it a practical choice for retained roots in the lower molars, where the combination of dense bone and multi-rooted anatomy calls for a sturdier working end than smaller elevators provide.
Clinicians building out a full Kopp set typically pair this size with the narrower 3.6 mm lower elevator, using each where root diameter calls for it rather than forcing one instrument to handle every case. That kind of size progression is common practice among oral surgeons who see a steady mix of molar and premolar extractions requiring root elevation.
Having a larger-tip option specifically for lower molar roots means fewer moments of reaching for a mismatched instrument mid-procedure.
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