The Dental Technician August 2017/Vol 70 Issue 07
Continued from page 29 Check the bite to determine which classification it falls into as this will affect the way in which they are trimmed, for example a class III bites usually require a wider lower base and the upper needs to be trimmed to allow for this.
Taking care to ensure that the dental midline is facing directly forwards, trim the back edge of the upper model level 90 degrees to the base.
Using a slide attachment if available trim the buccal sides of the upper model to a 65 degree angle, checking that enough space is left for the lower to be trimmed to match especially if this is a class III case.
If you have a smoothing wheel on your grinder smooth the sides of the models at this stage.
Place in a model dryer to dry or leave at room temperature for a minimum of 48 hours to dry completely before boxing away. This will ensure that all the excess water has dried off and that the models will not be susceptible to mould during storage.
Trim the labial segments of the upper model to a 25 degree angle, do this to either side of the model making sure that the central point which is subsequently formed meets at the midline point.
Place the upper and lower models into occlusion with the wax bite and trim the backs level using the upper as the guide.
FINISHED PRODUCT Neaten off the edges of your models once more at this stage to flatten them off.
Trim the heels of the upper to 115 degrees
Place the upper and lower into occlusion and trim the lower base to match the upper, however; instead of making the lower front a point round it off instead. Using a slide attachment if available or by eye, trim the top surface of the upper model so that the bases are parallel. This is dictated by the lower and the occlusal plane trimming done previously.
Mark the models with the patient’s details.
REFERENCES: 1) GOV.UK, n.d. Data Protection. [Online] Available at: https://www.gov.uk/dataprotection/the-data-protection-act [Accessed 16 July 2017]. 2) GOV.UK, n.d. Records management code of practice for health and social care. [Online] Available at: https://www. gov.uk/government/publications/recordsmanagement-code-of-practice-for-healthand-social-care [Accessed 16 July 2017]
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