Dale R. Rosenbach DMD

	With the preponderance of published data demonstrating compelling reasons to remove teeth as minimally invasively as possible, the burden of finding and utilizing effective methods of atraumatic exodontia falls upon the clinician as never before. 

	Clinicians often work in regions with thin plates of bone and thin overlying soft tissue, and a shift in thinking has developed to promote tooth removal procedures that demonstrate a remarkable concern for maintaining perfectly intact facial plates with minimal disruption of papillae or the midfacial zenith of soft tissue. 

	One way of achieving this is by sectioning multi-rooted teeth prior to elevation and extraction. Another is by creating space between a tooth and the surrounding bone by troughing around it with a bur prior to employing somewhat more traditional extraction techniques. Both of these unconventional techniques can be made simpler by employing the use of a long diamond needle bur, such as the 

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	A critical factor in sectioning posterior teeth is appreciating the root trunk length, or the distance between CEJ and the furcation entrance. Attempting to remove the roots of a multi-rooted tooth that has been sectioned short of the furcation entrances can lead to an even more traumatic extraction than without sectioning at all.

	In health, the gingival margin lies at or very near the CEJ, and so its distance from the furcation entrance is virtually identical to that of the root trunk length. Different sources cite various average dimensions for root trunk lengths for multi-rooted teeth, but it is critical to recognize that actual values may vary greatly from the reported means.

	The importance of the root trunk length is as follows: Failure to section completely to the furcation can turn what was supposed to be a minimally invasive extraction into one that becomes even more surgically invasive than a traditional extraction-attempting to elevate roots that have been incompletely sectioned more easily results in fracture of the root trunk from the more apical root cone.

	The cutting length of an average barrel-shaped bur is 4 mm long and is sometimes greater than 1 mm wide. Use of such a bur often leaves a wide path that, in many cases, won’t even reach the furcation with a single sweep of the bur. Multiple subcrestal bur sweeps are thus indicated to reach the furcation, and because it is difficult to maintain perfect parallelism and positioning with each sweep, the sectioned area becomes wider than necessary and may present with an irregular profile, hampering efforts to access it with an elevator.

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	Conversely, using an 11 mm long diamond needle bur, such as the 1312.11C NeoDiamond bur from Microcopy, can simplify this task immensely. After either decoronating the tooth or sectioning to the gingival margin with a barrel-shaped or round bur, the diamond needle bur can be sunk to reach the furcation on many teeth by advancing just past halfway its cutting surface. While this bur is 1.2 mm at its greatest diameter, it is only 0.61 mm at the tip and 0.86 mm at the halfway point, permitting clinicians to reach deeply into the subcrestal region while removing only as much tooth structure as necessary to section past the furcation entrance.

Check out the technique in this step-by-step video: 

Continue to page two for a step-by-step case study showing how the NeoDiamond 1312.11C bur can be used for extractions.

Circumferential troughing around teeth and roots

 1312.11C bur  can also be used to simplify extraction of single rooted teeth. By sinking the long diamond needle bur into the PDL space around a tooth, subcrestal fibrous attachments are obliterated and space is created for both gaining better purchase points and more efficient luxation.

	In keeping with the principles of atraumatic exodontia, care should be taken to focus circumferential bone removal at the proximal surfaces and away from the facial and lingual/palatal socket walls, which may be thinner, more fragile and thus more susceptible to fracture and/or resorption. The length, taper and narrowness of the 1312.11C bur provide the best combination of features to achieve one of the most simple and least traumatic methods of tooth removal.

The 1312.11C bur sunk into the distal sulcus of tooth No. 12, exhibiting a complete loss of the buccal half of the supragingival tooth structure. The bur was then drawn along the entire distal proximal surface. 

  Following preparation and temporization for a crown, tooth No. 14 was determined to have a subcrestal fracture and was sectioned along the furcal paths with the long-needle diamond bur. (Notice how the cut corresponding to the M furcation is palatalized because the MB root is so large that it displaces the furcation palatally.)

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  After elevating the tooth segments off of one another, the DB root is easily delivered with forceps, despite having only the thinnest sliver of supragingival tooth structure to grab onto.

The MB root is extracted. The immensity of the MB root socket and the palatalization of the M furcal bone can now be fully appreciated.

Finally, the palatal root is elevated from its socket. The gingival margin remains virtually intact around the circumference of the socket. 

Due to the minimally invasive technique employed, both the hard and soft tissue remain largely undisturbed. The robust architecture of the furcal bone makes this an ideal site for immediate implant placement.

	The NeoDiamond 1312.11C bur from Microcopy can assist in making extractions simple and effective and, perhaps most importantly, very minimally invasive. Microcopy’s single-use price makes this method cost effective as well.

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Involved Teeth. In Lindhe, Karring, Lang, editors: Clinical Periodontology and Implant Dentistry, 4th Edition. London: Blackwell Munksgaard. 2003. pages 707-8.

Articles

With the preponderance of published data demonstrating compelling reasons to remove teeth as minimally invasively as possible, the burden of finding and utilizing effective methods of atraumatic exodontia falls upon the clinician as never before.