Clinical
Fig 8 Tooth preparation guide
Fig 9 Before smile
Fig 10 After smile
Continued »
totally logical when taught. It gives more precise control over preparation and greater accuracy of cut and can be used in most areas of the mouth. It gives the clinician the ability to ‘lock’ his wrist so that the prepa- ration proceeds more quickly and efficiently without under- cuts. The use of the speed-
increasing handpiece is a must for the finesse of the
preparation and for margin and retention features. Few dentists appear to have this handpiece and rely on the turbine for their final preparation. The turbine cuts too rapidly for the final stage of tooth preparation where the speed-increasing handpiece is required. Fibre optic hand- pieces and the use of magnification using dental loupes increases visibility and allows the dentist to cut a more precise preparation.
By working at 12 o’clock
directly behind the patient for anterior restorations it ensures that all axial wall preps are perpendicular to the chosen occlusal plane and assists in maintaining ideal contact points/areas between adjacent restorations and the ideal interdental papillae profile, essential for aesthetic restorations, and good lab communication (Figs 9 and 10). Finally, by knowing and
understanding bur size, the dentist can cut with precision and speed. The taper and size of the cutting edge is paramount in understanding preparation techniques. With the use of a preparation guide – often a putty matrix – correct preparation is made easy. The next article in the series starts with tooth preparation proper by describing the techniques involved in preparing for a porcelain fused to metal crown (PFM)
32 Ireland’s Dental magazine
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