Dr Prince Kumar (PROSTHODONTICS)

1. FACULTY OF DENTAL SCIENCES
Dr Prince Kumar

2. Compensating curves

3. Factors of Balanced Occlusion
• Inclination of the condylar path or condylar guidance
• Incisal guidance
• Orientation of the plane of occlusion or occlusal plane
• Cuspal angulation
• Compensating curves.

4. • The compensating curves are artificial
curves introduced into the complete denture
occlusion in order to achieve a balanced
occlusion. They are called compensating
curves because they compensate for the
space (Christensen's phenomenon) formed
between the posterior portions of the upper
and lower occlusal surfaces during eccentric
movements of the mandible.

5. • Definition: The anteroposterior curvature
(in the median plane) and the mediolateral
curvature in the frontal plane in the
alignment of the occluding surfaces and
incisal edges of the artificial teeth that are
used to develop balanced articulation
(GPT-6).

6. Curvatures in natural dentition
• Curve of Spee
• Curve of Wilson
• Pleasure Curve

7. Curve of Spee
• 1980-German anatomist- Ferdinand Von Graf Spee
described an occlusal curve after studying human
skulls.
• Definition: The anatomic curve
established by the occlusal
alignment of the teeth, as
projected on to the median
plane, beginning with the cusp tip
of the mandibular canine and
following the buccal cusp tips of
the premolar and molar teeth, continuing through the
anterior border of the mandibular ramus, ending with
the anterior most portion of the mandibular condyle..

8. Curve of Wilson
• It is a mediolateral curve that contacts
the buccal and lingual cusp tips on each
side of the arch. It results from the
inward inclination of the posterior teeth
(mandibular molars), making the lingual
cusps lower than the buccal cusps
• .
• Consequently, the buccal cusps are
higher than the palatal cusps in the
maxillary arch . In the natural dentition,
this arrangement helps the teeth resist
masticatory loads better.

9. Pleasure curve
• Defined as, A helicoidal curve of occlusion that,
when viewed in frontal plane conforms to a curve
that is convex superiorly
except for the last molars
which reverses that pattern
• Usually seen in excessive wear of teeth
• Described by: Max Pleasure

10. Compensating curves:
• A) Anteroposterior curves-(curve of Spee)
• B) Mediolateral curves- (Curve of Monson)

11. Curve of Spee
• incorporated -raising the distal portions of
the first and second molars to conform to a
curve
• compensate for the wedge shaped opening
(Christensen's phenomenon), which occurs
in the posterior part of the occlusion rims
when the mandible is protruded.

12. Mediolateral curve-
• compensates for the wedge like opening
formed when the mandible is moved
laterally to the opposite side.

13. Curve of Monson
• It is an artificial curve, based
on Monson's spherical theory
of occlusion.
• Defined as, A proposed
ideal curve of occlusion in
which each cusp and or
inciisal edge touches or
conforms to a segment of the
surface of the sphere 8
inches in diameter, with its
center in the region of the
glabella.

14. • Curve of monson- involves all the teeth
• Curve of Wilson-involves only molars

15. Reverse curve (Pleasure curve/
Antimonson curve/ Frequency
curve)
• Given for maxillary first premolar by raising
palatal cusp higher than the buccal cusp.