| 摘要 |
A fixture and method for use in dental training is disclosed which assists a student in learning how to determine the position of a root canal apex. The fixture and method include a tooth having a root canal and root apex with an electrically-conductive medium set around the root and root apex and securing the tooth in a fixture. An alternative embodiment uses first and second conductive mediums wherein the first medium is set around the root and root apex. The tooth is set into a fixture containing a second electrically-conductive medium. An electronic apical position locator is connected to an endodontic reamer and to the electrically-conductive medium in the fixture so that when the reamer is advanced through the root canal to the root apex, the electronic locator so indicates. Some locators are sufficiently sophisticated to indicate the distance of the reamer tip from the apex. In others an electrical circuit is closed causing the apical position locator to so indicate. The electrically-conductive media may be selected to be partially radiographically opaque to aid in the training of the use of the apical position locator. The conductive media is selected to match or approximate the impedance levels of human tissue and correspond to impedance levels capable of being sensed by the electronic circuit of the apical position locator. Practice with this fixture and method enables a student to gain experience in determining the location of a root apex without the necessity to practice upon a live patient.
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