Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
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Maxillo-mandibular Relationships - 27<br />
Recording Maxillo-mandibular Relationships<br />
In order to fabricate complete dentures outside of the patient’s mouth, certain relationships<br />
need to be transferred to an articulator, which will be used to set the teeth and arrange the<br />
denture occlusion. These relationships include:<br />
Occlusal vertical dimension - amount of separation between the mandible and<br />
maxilla when the denture teeth will be in contact<br />
Hinge Axis Location - locating the relationship of the maxilla to the transverse<br />
horizontal axis and an anterior reference point<br />
Centric position - the horizontal relationship (anterior/posterior and medio-lateral) of<br />
the maxilla and mandible, where maximum intercuspation of the denture teeth<br />
will be created<br />
Protrusive relationship - used to program the articulator to simulate the relationship<br />
of the maxilla and mandible in excursive movements so that the denture teeth can<br />
be set in a harmonious relationship<br />
Record Bases (Baseplates) and Occlusion Rims<br />
The maxillary and mandibular casts can be accurately related on an articulator using record<br />
bases and wax occlusion rims. The record bases simulate the finished denture base and the<br />
wax occlusion rims simulate the position of the teeth for the purposes of making these<br />
records. To make the recording of jaw relationships easier, the occlusion rims are made<br />
slightly bulkier than the denture teeth to provide additional stability during record making.<br />
After the maxillary and mandibular casts are related on the articulator, the bulk of the wax<br />
rim is replaced by denture teeth, so that the contours of the denture and position, size and<br />
other aspects of the dentures can be evaluated prior to processing.<br />
The maxillary record base should be retentive. A non-retentive record base usually results<br />
from failure to adapt the resin (particularly from the posterior border and palate) during<br />
polymerization. Alternatively, looseness may be caused by over- or under-extension, or by<br />
the use of too much blockout. In cases of minimal looseness, a denture adhesive may be<br />
used to keep the record base in place. If pronounced looseness exists, time will be saved by<br />
remaking the record base prior to jaw relation records.<br />
Make the rims slightly higher than required (23 mm average height from the flange of the<br />
record base to the rim), so you can reduce the height as necessary.