A MODEL SYSTEM FOR EVALUATING FILING TECHNIQUE

The aim of this study was to develop a model system to demonstrate the pattern of load and how much is applied. A lower molar was mounted on a beam and attached to a mandibular phantom head jaw. A strain gauge fitted to the beam allowed loading of the molar to be recorded, during root canal preparation. Ten operators were asked to instrument the di stal root canal; after preparation the operators were shown a graphica l representation of the loads applied. This formed the basis of discus sion and instruction in filing technique. The operators then repeated the filing. The results showed that prior to instruction operators use d a push-pull motion, applying a constant lateral force to the canal w all. After instruction and discussion of the graphical representation of the loads applied the stroke rates used were slower and loads appli ed were higher (two-sample t-test, n=10, P<0.01). The experiment was r epeated 1 year later and this showed that the change in technique had been retained. In conclusion, this model system allows visual feedback to the operator and can be used as an aid to teaching filing techniqu e.