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14 “ MUNCE, Page 12 nacular for this operation when using burs was different and was yet to be de- veloped. Terms we introduced or refined to apply to troughing when using Munce Discovery Burs included: View corridor — the view beyond the handpiece head to the target area, which is much improved with 31- and 34-mm- long, narrow-shafted burs because the extra length draws the handpiece head away from the target area, and the de- creased diameter of the shaft puts much less visual “noise” into the view corridor (Figs. 5a, b). Shaft ifjpingefjent — occurs on ac- cess cavity walls with 2.35-mm-diameter shafts of standard, slow-speed burs. This problem is greatly reduced with the nar- row shafts of Munce Discovery Burs (Figs. 5a, b). Target area — that place where the head of the bur is to perform its work, and the target area becomes much more visible because of the longer/narrower shaft as mentioned above. Shaft stiffness — a necessary feature of the positive control provided by these burs. Other long-shafted burs have shafts that are too narrow, sacrificing control and leading to “noodling” under trough- ing and other operations (Fig. 6). Noodling — not a feature of the Munce Discovery Burs. This undesirable fea- ture was specifically designed out of the Munce Discovery Bur shafts. Heatless and virtually non-breakable — important features that distinguish these burs from ultrasonic tips. 2011 • To facilitate deeper exploration and shaft-parallel cement-line dissection (Fig 7), we reduced the shaft-diameter to 0.7 mm on the last 10 mm of the three smallest head sizes — #1/4, #1/2 & #1 — in both deeps and shallows (Fig 8). Although 0.7 mm is very narrow, the specific geometry we designed into this change maintains the trademark stiff- ness of the shaft and facilitates cement- line dissection around posts and silver points while the shaft of the bur is virtu- ally parallel to the long axis of the post or silver point. Shaft-parallel cement-line dissection is completely impossible with 2.35 mm-diameter shafts of standard slow speed burs. E X H I BI TOR S Endo Tribune U.S. Edition | April 26, 2017 Figs. 5a, b: The view corridor opened up by the long shaft offers visual and physical access to deep target areas, while the narrow shaft greatly reduces shaft impingement on access cavity walls. About the author Fig. 8: Features of the Munce Discovery Bur. C. John Munce, DDS, FICD, is a diplomate of the American Board of Endodontics and a professor of graduate endodontics at both Loma Linda Univer- sity and the University of Southern California. He is a fellow of the International College of Dentists and past president of the California State Associa- tion of Endodontists. Munce received both his training in endodontics and his dental degree from Loma Linda University. He is a frequent interna- tional lecturer and the primary author of the chap- ter “Preparation for Endodontic Treatment” in the celebratory 50th anniversary seventh edition of “Ingle’s Endodontics,” to be released this spring. Clinical concepts and techniques originated by Munce have been published in a number of pri- mary endodontic textbooks, most recently in the sixth edition of “Ingle’s Endodontics” and the 10th edition of “Pathways of the Pulp,” and he co-authored a chapter on MTA repair of post perfo- rations in Dr. Nadim Baba’s prosthodontics text- Fig. 6: Stiffness of Munce Bur shaft v. noodling of Mueller Bur. Fig. 7: Shaft-parallel cement-line dissection of a stainless-steel post with a Munce Discovery Bur. • For ease of head-size identification, we book, “Contemporary Restoration of Endodonti- added color bands on the shafts (Fig. 8). cally Treated Teeth.” 2015 • A cotton plier-insertion ledge (Fig. 8) was added at the transition from the 2.35-mm-diameter portion of the shaft to the 1-mm-diameter portion to facilitate ease of insertion of the bur into the spinning handpiece while protecting the color band from abrading because of slippage of the cotton plier, which would otherwise occur. • We also significantly modified the head geometry to allow the bur to be more effective in planing operations on dentin walls (Fig. 8). In particular, this new design prevents catching on the out- stroke when planing, reducing the risk of ledging and perforation. 2017 • We continue to resist the suggestion by some to downgrade this unique spe- cialized bur from a carbide-tipped bur to a stainless-steel bur in order to reduce costs on the expectation of perhaps in- creasing sales volume. Our view is that this would be a shortsighted strategy that would lead to an inefficient instru- ment, subsequently substandard clinical results and dissatisfied clinicians. From necessity, to idea, to sketch- on-a-napkin, then invention, technical drawing, prototyping, tweaking, bench- testing, collegial input, tweaking some more, manufacturing, marketing and worldwide distribution — to mention just some of the many steps involved — through all of these phases, CJM Engi- neering has always listened to the needs of clinicians in our specialized discipline and endeavored to be the absolute best that we can be in the multi-faceted pro- cess of not just being a pass-through for Fig. 9: TruGrit TroughRefiner (soon to be released). See—and feel—the prototype at booth No. 518. somebody else’s products but rather a company that delivers previously nonex- istent high-quality key products invent- ed by an endodontist for endodontists and endo-savvy dentists worldwide. Although it may seem to be a simple product at first glance, in reality, a truly complex instrument like the Munce Dis- covery Bur can’t just be cranked out by a bur company. It requires ongoing, open- to-improvement, firsthand experiential clinical knowledge to deliver a high- quality clinical instrument that will stand the test of time in the hands of some of the world’s most talented — and critical — clinicians. CJM Engineering is not a bur company; we’re a “help clinicians save people’s nat- ural dentition” company — full stop. So now you know the drill even better than before, and we invite you to drop by booth No. 518 at AAE17 for a look at — and feel of — the prototype of our new Super Shallow TruGrit™ Trough Refiner™ (Fig. 9), inspired by you and other col- leagues from around the globe. Though it’s not available for sale yet, it will be very soon, and once in full production, we hope you’ll take it to the chair, and give it a whirl.