SHOWCASE -90 degree meets 40/10 evolve

[Chuck Goodis]

90 degree meets 40/10 evolve

Featured X-Ray:

Case Summary:

#3 partially necrotic tooth with a severe curve greater than 90° in the mesial root. Formed the glide-path with a number 10 hand file and established working length. Then used the EdgeEvolve rotary files. Took a 17/04 filed to work in length. Then took each successive file to the working length 20/04 25/04 30/04 35/04 40/04. Then increased the taper with a 40/06 40/08 40/10. What's obvious is how well the 40/10 was able to negotiated the 90 deg curve in the mesial root. But what's more subtle is how well it kept the apical anatomy in the palatal root and the slight S curve in the distal root. That's innovation!

Files & Products Used:

EdgeEvolve
EdgeLube
EdgeSeal
EdgePaperPoints
EdgeCore

Additional X-Rays & Extras:

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[macadoo]

I'm looking forward to hearing more about this new file. That .10 taper is huge, but I'm assuming it's only .10 in the apical 1/3 of the file?

[Guest]

Why did you decide to use such a large taper in MB canal? Why not a 04 taper?

[Dm33$]

This contradicts the AAE initiative of dentinal conservation. 

[macadoo]

This contradicts the AAE initiative of dentinal conservation. 

​Then every endodontist using ProTaper is in violation of this initiative.  

The issue with a large taper in this file isn't an issue, as the MFD is only 1.0 mm.  The issue is whether it's safe to take that a file that size around a curve like that.  According to McSpadden's calculations relating file diameter at the point of a curve, it's certainly not safe.  Not to say it can't be done, but it places the file at higher risk of separation.

[macadoo]

Meant to say that "the issue with a large taper in this file isn't the amount of cervical dentin removed, as the MFD is only 1.0 mm"