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D2 F ROM PAGE 1 Endo Tribune U.S. Edition | June 2017 “ MUNCE, Page D1 ence in applying these burs in diverse clini- cal circumstances combined with the freely offered suggestions and requests for modi- fications from colleagues around the globe. 2006 • A friend in the dental instrument man- ufacturing business, Lonnie Graybill of Integra-Miltex, suggested the name, Munce Discovery Burs, and it stuck. • The Munce Discovery Bur line started with 34-mm-long burs only, and in only four head sizes: #1/2, #1, #2 and #4 (Fig. 3). • At that time, we produced only the 1-mm-diameter shaft on all four head sizes. 2007 • We added the 31-mm-long Shallow Troughers to the line. • To distinguish the two different lengths, we began referring to the burs as Munce Discovery Bur Deep and Shallow Troughers. • We added our tiniest head size, #1/4 — with a head diameter equal to the tip of a #50 K-file — and a #3 head size, to both Deeps and Shallows. • We added 3 mm “sounding” rings on the Deeps. • We introduced the 31-mm-long #6 Endodontic Cariesectomy Bur. • Although “troughing” as an endo- specific operation associated with ultra- sonic tips was already developing its own vocabulary within the endodontic com- munity, the specific vernacular for trough- ing when using burs was different and was yet to be developed. Terms we introduced or refined to apply to troughing when us- ing 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 decreased di- ameter of the shaft puts much less visual “noise” into the view corridor (Figs. 4a, b). Shaft impingement — occurs on access cavity walls with 2.35-mm-diameter shafts of standard slow-speed burs. This problem is greatly reduced with the narrow shafts of Munce Discovery Burs (Figs. 4a, 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. 5). Noodling — not a feature of the Munce Discovery Burs. This undesirable fea- ture was specifically designed out of the Munce Discovery Bur shafts (Fig 5). Heatless and virtually non-breakable — important features that distinguish these burs from ultrasonic tips. 2010 • For ease of head-size identification, we added color bands on the shafts (Fig. 6). 2011 • We reduced the shaft-diameter to 0.7 mm on the last 10 mm of the three smallest head sizes in both Deeps and Shallows (Fig 6) to facilitate deeper explo- ration and shaft-parallel cement-line dis- section (Fig 7). Although 0.7 mm is very narrow, the specific geometry maintains Figs. 1, 2: The lack of a long/stiff/narrow-shafted troughing bur led to chairside fabrication to meet the need. Photos/Provided by Dr. C. John Munce Fig. 3: The first ad announcing release of Munce Discovery Burs. Figs. 4a, 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. Fig. 7: Shaft-parallel cement-line dissection of a stainless-steel post with a Munce Discovery Bur. isfied clinicians and patients. From necessity, to idea, to sketch-on-a- napkin, then invention, technical drawing, prototyping, bench-testing, collegial input, tweaking, manufacturing, marketing and worldwide distribution, CJM Engineering has always listened to the needs of clini- cians in our specialized discipline and en- deavored to be the best that we can be in the multi-faceted process of not just being a pass-through for somebody else’s products but rather a company that delivers previ- ously nonexistent, high-quality products invented by an endodontist for endodon- tists and endo-savvy dentists worldwide. Although it may seem to be a simple product at first glance, in reality, a truly complex instrument such as this doesn’t just roll off of a bur company’s produc- tion line. It requires ongoing, open- to-improvement, experiential clinical knowledge to develop a high-quality in- strument 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 natu- ral dentition” company — full stop. So now you know the drill even better than before. C. JOHN MUNCE, DDS, FICD, is a diplo- mate of the Ameri- can Board of End- odontics and a professor of gradu- ate endodontics at both Loma Linda Uni- versity and the Uni- versity of Southern California. He is a fel- low of the International College of Dentists and past president of the California State Association of En- dodontists. Munce received both his training in end- odontics and his dental degree from Loma Linda University. He is a frequent international lecturer and the primary author of the chapter “Preparation for Endodontic Treatment” in the celebratory 50th anniversary seventh edition of Ingle’s Endodontics. Fig. 5: Stiffness of Munce Bur shaft vs. noodling of a Mueller bur. Fig. 6: Features of the Munce Discovery Bur. the trademark stiffness of the shaft and facilitates cement-line dissection around posts and silver points while the shaft of the bur is virtually parallel to the long axis of the post or silver point. Shaft-parallel cement-line dissection is completely im- possible with 2.35-mm-diameter shafts of standard slow speed burs. 2015 • A cotton plier insertion ledge (Fig. 6) 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 spin- ning handpiece while protecting the color band from abrading under slippage of the cotton plier, which would otherwise occur. • We modified the head geometry (Fig. 6) to prevent catching on the outstroke when planing dentin walls, reducing the risk of ledging and perforation. 2017 • We continue to resist the suggestion by some to downgrade this unique special- ized bur from a carbide-tipped bur to a stainless-steel bur in order to reduce costs on the expectation of perhaps increasing sales volume. Our view is that this would be a shortsighted strategy that would lead to an inefficient instrument, subsequent- ly substandard clinical results and dissat- ENDO TRIBUNE PUBLISHER & CHAIRMAN Torsten Oemus t.oemus@dental-tribune.com PRESIDENT/CEO Eric Seid e.seid@dental-tribune.com GROUP EDITOR Kristine Colker k.colker@dental-tribune.com MANAGING EDITOR ENDO TRIBUNE Fred Michmershuizen f.michmershuizen@dental-tribune.com MANAGING EDITOR Sierra Rendon s.rendon@dental-tribune.com MANAGING EDITOR Robert Selleck, r.selleck@dental-tribune.com PRODUCT/ACCOUNT MANAGER Humberto Estrada h.estrada@dental-tribune.com PRODUCT/ACCOUNT MANAGER Maria Kaiser m.kaiser@dental-tribune.com BUSINESS DEVELOPMENT MANAGER Leerol Colquhoun l.colquhoun@dental-tribune.com EDUCATION DIRECTOR Christiane Ferret c.ferret@dtstudyclub.com ACCOUNTING COORDINATOR Nirmala Singh n.singh@dental-tribune.com Tribune America, LLC 116 West 23rd Street, Suite 500 New York, NY 10011 Phone (212) 244-7181 Fax (212) 244-7185 Published by Tribune America © 2017 Tribune America, LLC All rights reserved. Tribune America strives to maintain the utmost ac- curacy in its news and clinical reports. If you find a factual error or content that requires clarification, please contact Managing Editor Fred Michmershuizen at f.michmershuizen@dental-tribune.com. Tribune America cannot assume responsibility for the validity of product claims or for typographical er- rors. The publisher also does not assume responsibil- ity for product names or statements made by adver- tisers. Opinions expressed by authors are their own and may not reflect those of Tribune America. EDITORIAL BOARD Frederic Barnett Dr. Roman Borczyk Dr. L. Stephen Buchanan Dr. Gary B. Carr Prof. Dr. Arnaldo Castellucci Dr. Joseph S. Dovgan Dr. Unni Endal Dr. Frnando Goldberg Dr. Vladimir Gorokhovsky Dr. Fabio G.M. Gorni Dr. James L. Gutmann Dr. William “Ben” Johnson Dr. Kenneth Koch Dr. Sergio Kuttler Dr. John T. McSpadden Dr. Richard E. Mounce Dr. John Nusstein Dr. Ove A. Peters Dr. David B. Rosenberg Dr. Clifford J. 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