WAMkey device. Ensure that the instrument is positioned as close as possible to the centre of the tooth stump, so as to work as close as possible to the long axis of the preparation during the removal procedure. 4. Simply insert the key all the way to the end of the tunnel drilled in step three and rotate it one quarter-turn. This creates a coupling force between the preparation and the crown’s inner side. If the tunnel was properly drilled, this movement should occur in the long axis of the preparation (Figs 5-7). The shape and surface
condition of the WAMkey means a much lower degree of force is required to loosen a crown than with a tradi- tional crown ‘puller’. The forces are essentially exerted in the axis of the prepara- tion, provided that the tunnel between the crown and the preparation was drilled as close as possible to the centre of the preparation. The advantages of the
device are: • quick and simple and easy to use • little risk to the core • less wear and tear on rotary instruments • reuse of the crown or bridge. If the dentist does not modify the margin of the abutment, and the crown still fits the abut- ment, then a simple repair will enable the crown to fulfil all of its original functions. The limitations are:
• it is generally not possible to use the WAMkey to remove crowns from anterior teeth owing to their configuration.
® For further information on the WAMkey, contact Paul Harrison, Swallow Dental Supplies Limited on 01535 656 312 or visit
www.swallowdental.co.uk For more informationon the British Academy of Restorative Dentistry, visit their website at
www.bard.uk.com The first BARD study club will be held in Edinburgh on 28 May and will feature a talk by Dr Paul A Tipton.
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Fig 7 Scottish Dental magazine 49
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