How can I safely and efficiently remove gutta percha to prepare a post space? Video Demonstration
In this short video (1:56), Dr. Bob Loney, Professor and Chair of the Dental Clinical Sciences Department at the Faculty of Dentistry, Dalhousie University, demonstrates how to remove gutta percha from a root canal in order to prepare an adequate post space to support a restoration on an endodontically treated tooth.
- Use non-end cutting drills to prepare the post space.
- Always start with the smallest size of Gates Glidden drill or Peeso reamer and work up to the size required to accommodate the desired size of a post.
- Size the instrument, referring to a radiograph of the tooth and pick the smallest drill size that will remove all the gutta percha at the most apical position you want to remove material from.
- Prior to using a non-end cutting drill, create an adequately sized hole in the surface of the gutta percha with either an explorer or a small round bur. This will allow for the drill side flutes to be immediately engaged and will maximize efficiency.
- No pressure is necessary because the action of the side flutes will have the effect of pulling the drill down the canal.
- Use a stopper on your drill, in order to avoid over-preparing the canal and to leave 5 mm of gutta percha at the apex of the root.
- Once the working length is established, apply a side-to-side motion as you move the drill up and down. This shapes the side walls of the canal to allow for the post to be accommodated.
- Use a post drill to square up the apical end if you are using a pre-fabricated parallel-sided post.
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