Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Selecting & Setting Teeth - 55
- the separation of posterior teeth, is affected by several factors (Hanau’s quint):
a) Condylar angulation (recorded by the protrusive record)
b) Incisal guidance (set by the dentist when making dentures)
c) Cusp angle and fossae depth (selected by the dentist)
d) Occlusal plane (determined by the dentist in forming the wax rims)
e) Curve of Spee and Curve of Wilson (depends on inclination that teeth are set)
As the condyle moves down the fossa, posterior teeth separate (upper left). Contacts
can be maintained by tilting the occlusal plane to more closely approximate the angles
of the condylar and incisal guidances (upper right), introducing more of a curve to the
occlusal plane (lower left), or adding teeth with higher cusp angles (lower right).
- Because setting of anterior teeth affects the incisal angle, which can also cause separation of
the posterior teeth, the clinician should stipulate how anterior teeth are set. In general, for a
monoplane occlusion, no overbite is set. For lingualized occlusion, an overbite may be set to
improve appearance if the posterior teeth can balance in excursions 2-3mm from centric. If
the incisors prevent the posterior teeth from balancing by discluding them (usually this
occurs when very little horizontal overlap or overjet is present), then the incisal angle can be
set to zero (i.e. no overbite).
When 1.5-2.0mm of overjet can be set, a lingualized occlusion (left) can have overbite
set. Monplane occlusion (right) should normally have no overbite set.