Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Selecting & Setting Teeth - 51
f) Advantages: More natural appearance (anatomic teeth) of the maxillary teeth with
forces centered over the mandibular teeth
g) Disadvantages: Technically more challenging than monoplane scheme, no
definitive studies to prove improved stability;
h) Contraindications: Extreme cases of the following: difficulty in obtaining
repeatable centric record (incoordination, jaw malrelations, severe ridge resorption
(lateral forces displace the denture) may more easily be handled with a monoplane
scheme.
2. Monoplane Occlusal Scheme
a) Cuspless teeth are set on a flat plane with 1.5- 2 mm overjet – there is no cusp to
fossa relationship. No anterior contacts are present in the centric position
b) No overbite is incorporated into the anterior setup. An overjet of 2 mm is used to
create an illusion of overbite.
c) In eccentric movements there usually no contacts on the balancing sides of the
denture, depending on the condylar inclination and other aspects of the denture
setup. Anterior teeth make contact in excursions. Modifications have been made to
the monoplane scheme, so that balancing ramps, compensating curves can be added
in an attempt to improve stability.
d) The philosophy is based on the idea that by eliminating cusps, lateral forces on the
dentures will be reduced, thereby improving denture stability. This scheme was
proposed as a means to simplify the arrangement of denture teeth.
e) Advantages: Technically easier to achieve, especially if there is difficulty in
obtaining repeatable centric records (muscle incoordination), or if there is a skeletal
malocclusion, or severe residual ridge resorption.