Carbon Fibre Posts
From: "J.M. Whitworth" Sent: Thursday, May 10, 2001 10:18 PM Subject:Carbon fibre posts Does anyone have experience of removing carbon fibre posts, cemented with a resin? Invisible on X-xay, I was caught out this afternoon. The crown has to come off to visualise them better of course, but any other tips? Do they absorb ultrasonic energy, or shake out nicely like metal ones? Do they drill out safely? Any tips gratefully received, Dr John Whitworth
From: "Giuseppe Riccardi" Sent: Friday, May 11, 2001 5:26 AM Subject: Carbon fibre posts you need magnification and a nice thin long diamond and you have to go very carefully. If you can visualize it you will not have problems. Being black they are easily identified from the tooth structure Peppino Riccardi
From: "Robert Roda" Sent: Friday, May 11, 2001 12:34 AM Subject:Carbon fibre posts Depending on the type of post (Bisco posts do this), a peeso drill usually can channel through it and maintain alignment in the canal till you reach gutta percha. I don't think ultrasonic energy will be too good and you cannot pull them. The problem is if it's one of those posts with the crystalline structure like diamond ( I forget the name of them). May as well do surgery or pull the tooth! - Rob Roda
From: "Darick Nordstrom" Sent: Friday, May 11, 2001 1:03 PM Subject:Carbon fibre posts Dear John, I would begin with a narrow, rounded-end tapered cylinder diamond. If you do choose to go through the crown, you won't miss the black froth when you find the post. The diamond cuts it easily, but is best used to align yourself down the middle. Then you could switch to even faster, cleaner cutting carbides, though I often prefer the tactile sense of the diamonds. Darick Nordstrom, DDS
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From: "Arieh Kaufman" Sent: Saturday, May 12, 2001 2:34 PM Subject:Fiber post You may use tungsten LN burs manufactured by Maillefer or agate that is cut to half by carborundum disk so it surface becomes like a star.. Prof. Arieh Kaufman
From: "Darick Nordstrom" Sent: Sunday, May 13, 2001 12:02 AM Subject:ceramic posts Ceramic posts should be banned and recalled! I inherited a broken one and lucked-out, but wonder how many, in the process of breaking, put enough stress into the root to initiate a deadly fracture. The smooth-sided ceramic posts can possibly be removed by using a very fine long diamond circumferentially to trough and parallel the tapered shape, then small extractor-type "hole saw" to extend, then tube extractor with super glue, then rotate or connect to Densco "tapper" (very risky). This may not work with ceramic posts that have been etched, etc. to enhance bonding. The diamond-sided ultrasonic tips will generally do very little to the post, but furrow alongside. The narrow titanium endo tips might impart enough energy (after the troughing process) to weaken some cements. Fortunately, it has been found that many of the dentin bonding cements don't, but if the canal is not perfectly tapered, the removal force (if post is removed with cement on) is likely to split the tooth. darick
From: "Darick Nordstrom" Sent: Saturday, May 12, 2001 11:33 PM Subject:Carbon fibre posts One thing I forgot to mention was the use of the original fiber post kit reamers as an option if complete removal is desired since they are slightly end-cutting unlike the peesos, and usually self-align once you get started. The diamonds I mentioned (medium -medium fine) tend to be safer because they bog down slightly if you get outside the composite fiber. Darick
