50 Shades of Teflon – Part 2
The second part of our little Teflon Issue is here presented. In the previous article, we have highlighted the possibilities that this incredible tool can provide us with for a simpler and faster workflow in our daily practice. While the first part focused on its use in restorative dentistry, we now want to show some other situations in which we find Teflon to have become essential. We just want to re-share some technical information we listed in the first article. Properties: – Very low coefficient of friction (the third-lowest of any known solid material) which results in a high surface smoothness. – Chemically inert. – Insoluble in water and in organic solvents. – Non-stick. – Resistant to high temperatures. – Excellent dielectric properties. Applications: – Its excellent dielectric properties and high melting point make teflon the best material for isolating high performance cables, in aerospace and computer engineering. – One of most exploited property is the very low friction, which carries the PTFE to be used when high fluency is needed (gears, bearings, engines, etc.). – In the chemical industry is an excellent insulator, because of its resistance to acids. – Is widely used as non-stick coating of pots and cooking pans. – Common plumber teflon tape is used to seal tubes. – Gore-tex is made with teflon. Let´s now go to the other applications. Prosthodontics Teflon can be used in traditional prosthesis to isolate intermediate elements of the bridges, both in the relining (Img. 10) and in cementation procedures, reducing the excess of the material. It´s also very useful to fill undercuts in old and unstable prosthesis while taking an impression (Img. 2). In implant prosthesis is an excellent material to isolate the access hole; just create a Teflon braid rolling the tape with the fingers (Img. 3), insert it into the hole cut the excess and compact it: – In cemented prosthesis over the abutment. – In screwed prosthesis about 1.5 mm from the occlusal surface (Img. 4) and then cover up the access with the preferred material. Being very opaque, Teflon helps in hiding the grey shade of the metal (Img. 5). This material, inert and insoluble, is extremely stable and much more clean than traditional cotton pellet that can provide bad smell. Endodontics As suggested for implant prosthesis, Teflon is helpful to build up a temporary filling, when it is not possible to immediately restore the endodontically treated tooth. We have two ways for this: 1- Apply a self-etching adhesive and a drop of flowable composite over the gutta-percha, than some Teflon tape to isolate and a temporary filling material (Img. 6a). 2- Fill the cavity with Teflon and then apply an adhesive and a flowable composite to seal the tooth (Img. 6b) If we use cotton rolls while removing a temporary filling, it will usually wrap around our bur, making the classic whistle; this doesn´t happen with Teflon.
An original article by Giuseppe Chiodera and Giulio Pavolucci
Img. 1 – Teflon can be used to isolate bridges during rebasing or cementing procedures.
Img. 2 – Teflon can be compacted on the undercuts to avoid accidental decementation during impression procedures.
Img. 3 – Teflon is twisted ready to be put into the access cavity.
Img. 4 – Application of the teflon twist.
Img. 5 – Final closure of the access cavity with composite resin.
Img. 6 – Two ways of using teflon to create a temporary restoration in endodontically treated teeth.
Img. 7 – During impression, immediately after tooth extraction, it is useful to protect the socket and the suture.
As said, thanks to its versatility, Teflon is one of the best and most economic features you could add to you daily workflow. Its advantages make it ideal for multiple uses through the different disciplines of dental practice.