Modified Tooth Forms in Complete Denture Occlusion

A seminar on
Use of modified
tooth forms
in
complete denture occlusion
www.indiandentalacademy.com
INDIAN DENTAL ACADEMY
Leader in continuing Dental Education

Introduction
Key terms used
Occlusion –philosophies
 theories
 concept in breif
Anatomic teeth –unseen limitations
Non –anatomic teeth and their usage
Summary
conclusion

Types of Occlusion
Physiologic Occlusion
Defined as an Occlusion in which a functional equilibrium or
a state of homeostasis exists between all tissues of the
masticator system

Non Physiologic occlusion
A Non physiologic occlusion is defined as an
occlusion in which the tissues of the masticatory
system have lost their functional equilibrium or
homeostasis in response to their functional demand
Eg: Crowded or Malposed teeth, Impinging overbite
etc.
Treatment Occlusion
A treatment occlusion is a stereotypic occlusion
of conceptual, structural relationships and
theoretically required for optimum health, function,
comfort and esthetics

Introduction
• human face is lighted with a bright smile,an even
set of teeth with their curves and configurations
contribute to the lightening of the face
• ARRANGEMENT OF TEETH TO
OCCLUSION IS ESSENTIAL FOR THE
PHYSICAL AND PSYCHOLOGICAL WELL
BEING OF OUR PATIENTS

KEY TERMS
• OCCLUSION
• PHILOSOPHY OF OCCLUSION
• CONCEPTS OF OCCLUSION
• BALANCED ARTICULATION
• NON BALANCED ARTICULATION
• LINGUALISED OCCLUSION
• ANATOMIC TEETH
• NON- ANATOMIC TEETH
• SEMI ANATOMIC TEETH

OCCLUSION SCHEMES
• >ANATOMIC BALANCED OCCLUSION
• SEMI –ANATOMIC BALANCED
OCCLUSION
• LINGUALISED OCCLUSION –
BALANCED & NON BALANCED
• NEUTRO CENTRIC OCCLUSION

• These 5 schemes are broadly grouped under
• BALANCED ARTICULATION
• MONOPLNE ARTICULATION
• LINGUALISED ARTICULATION

BALANCED OCCLUSION
• The simmultaneous contact of maxillary
and mandibular teeth on the right and left
and in the posterior and in the anterior
occlusal areas in centric and eccentric
positions,developed to cease or limit tipping
or rotating of the denture bases in relation
to supporting stuctures
• GPT

BALANCED ARTICULATION
• Teeth should glide evenly
• No interferences
• Balanced occlusion ensures even pressure in
all parts of the arch
• Stability with the denture in centric and
eccentric position
• Classic example of bilateral balanced
occlusion/ Gysi

Advantages of using anatomic
teeth
• Esthetics
• Decreased stress on the ridge
• Compatible with TMJ
• Increases the stability
Dis-advantages of using anatomic
teeth
Technique sensitive
Generates greater lateral stress
Greater resorption of residual ridgeswww.indiandentalacademy.com

Tooth forms for the Cuspless
teeth
• Hall`s Inverted cusp teeth
• Myerson`s True cusp teeth
• Nelson`s Chopping Block teeth
• Swenson`s Non-lock teeth
• Hardy`s Vitallium occlusal teeth
• Myerson`s Shear cusp teeth
• Cook`s metal teeth
• Bader`s cutter bar

Non-Anatomic Teeth
• Advantages
• Employment in class II and class III jaw relations
• Closure of the jaws over broad contact area
• Minimal horizontal pressure
• Simple technique
• Dis-advantages
• Esthetically inferior compared to anatomical teeth
• Poor penetration of food
• Generation of lateral forces against the residual ridge

Balanced Occlusion
• Sheppard stated that “ENTER BOLUS EXIT
BALANCE
Monoplane Occlusion (Ponds Concept)
> Lingualised Occlusion by GYSI

Requirements of Maintaining
Stability by Herold Ottman
• Stability of occlusion at centric relation position and in an area forward andStability of occlusion at centric relation position and in an area forward and
lateral to it.lateral to it.
• Balanced occlusal contacts bilaterally for all eccentric movementsBalanced occlusal contacts bilaterally for all eccentric movements
• Unlocking the cusps mesiodistally to allow for gradual but inevitable setting ofUnlocking the cusps mesiodistally to allow for gradual but inevitable setting of
the bases due to tissue deformation and bone resorption.the bases due to tissue deformation and bone resorption.
• Control of horizontal forces by buccolingual cusp height reduction according toControl of horizontal forces by buccolingual cusp height reduction according to
residual ridge resistance form and interarch distance.residual ridge resistance form and interarch distance.
• Functional lever balance by favorable tooth to ridge crest position.Functional lever balance by favorable tooth to ridge crest position.
• Cutting, penetrating and shearing efficiency of occlusal surfacesCutting, penetrating and shearing efficiency of occlusal surfaces
• Anterior incisal clearance during all posterior masticatory function andAnterior incisal clearance during all posterior masticatory function and
bruxing activitybruxing activity
• Minimum occlusal contact areas for reduced pressure in masticationMinimum occlusal contact areas for reduced pressure in mastication
• Sharp ridges or cusps and generous sluice ways to shear and sheared foodSharp ridges or cusps and generous sluice ways to shear and sheared food
with the minimum of forces necessarywith the minimum of forces necessary

Philosophy of occlusion
by Brien R lang
• Tooth contact of opposing maxillary and mandibular teethTooth contact of opposing maxillary and mandibular teeth
at a jaw relation position that demonstrates reproductibilityat a jaw relation position that demonstrates reproductibility
• The degreee of incisal guidance established throughThe degreee of incisal guidance established through
positioning of the anterior maxillary and mandibular teethpositioning of the anterior maxillary and mandibular teeth
• The absences of deflection occlusal contacts and a freeThe absences of deflection occlusal contacts and a free
gliding articulation between opposing maxillary andgliding articulation between opposing maxillary and
mandibular anterior and posterior teeth during jawmandibular anterior and posterior teeth during jaw
movements.movements.
• The selection and arrangement of tooth forms or molds soThe selection and arrangement of tooth forms or molds so
that their occlusal surfaces permit occlusal reshaping tothat their occlusal surfaces permit occlusal reshaping to
achieve freedom in movement and an absence of deflectionachieve freedom in movement and an absence of deflection
• The positioning of anterior and posterior teeth to provide aThe positioning of anterior and posterior teeth to provide a
naturalness in apperance.naturalness in apperance.

CONCLUSION
• Treating the edentulous patient is a complexTreating the edentulous patient is a complex
undertaking that demands skill and medicalundertaking that demands skill and medical
knowledge. The homeostasis thatknowledge. The homeostasis that
characterisizes the healthy masticatorycharacterisizes the healthy masticatory
system is dependent on dynamic reciprocitysystem is dependent on dynamic reciprocity
amongamong DENTAL OCCLUSIONDENTAL OCCLUSION masticatorymasticatory
musculature and TMJmusculature and TMJ.
In edentulous patient this delicateIn edentulous patient this delicate
balance has been disrupted and must be re-balance has been disrupted and must be re-
establishedestablished..

Modified Tooth Forms in Complete Denture Occlusion

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