occlusion

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

2020-2021
Department of Prosthodontics
Department of: HERE
ARTICULATORS
By: Dr. Monia M.N. Kandil 3

Articulators

The non-adjustable articulator
Semi-adjustable articulator
Fully adjustable articulator
Arcon
Non- Arcon
Mean Value
Hinge
Panto-graphic tracing
Sterio- graphic
UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY
Articulator
Is a mechanical instrument that represents the temporomandibular joints and jaw members, to which maxillary and mandibular casts may be attached to simulate some or all- mandibular movements

020-2021

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY
Hinge articulator
Mean Value articulator
Non Adjustable Articulators

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Semi- Adjustable Articulators
Some of semi-adjustable articulators (for example, the Hanau H series, the Dentatus, and the Gysi) have the condyles attached to the upper member of the instrument (non-arcon), whereas others have the condyle attached to the lower member as occurs in nature (arcon)
Arcon articulator
Non Arcon articulator

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Deficiencies and inherent inadequacies of articulators
If the location of the axis of rotation relative to the cusp tip differs markedly from the patient to the articulator, the radius of the arc of closure of the cusp tips may be different producing an error.
The large dissimilarity between the (aha) and (mha) will produce a large discrepancy between the arc of closure of the articulator and of the mandible.
Semi adjustable articulator can be programmed to reproduce some mandibular movement capabilities; usually limited to straight line movements


I-Face Bow record or by Bonwill triangle
II-Centric relation record III-Eccentric relation records
a-Protrusive Record b-Lateral Excursion Records
UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY
Records needed for mounting on a Semi-adjustable Articulator:

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Fully Adjustable Articulators
An articulator that allows replication of three dimensional movement of recorded mandibular motions.
• It is the most accurate instrument.• It is designed to reproduce the entire character of the mandibular border movements, including: immediate and progressive lateral translation, and the curvature and direction of the condylar inclination. • Intercondylar distance is completely adjustable. The tracing of condyle path way is accomplished by helping of a pantographic tracer. Fully Adjustable PROTAR (9)

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Limitations of Fully adjustable condylar path articulators
The techniques required for its use demand a high degree of skill & are time consuming to accomplish. This type of instrument is expensive. For these reasons, they are used primarily for extensive treatment, requiring the reconstruction of an entire occlusion. Unavoidable errors that occur in recording the angulation of the condyle paths on using such instruments make their value doubtful.

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Articulators of the fully adjustable type include for example:
Stansbery tripod articulator. Hanau Kinoscope articulator. The Denar articulators. H.O. Beck and Coworkers have developed an experimental articulator that takes the factor of time into account by correlating the time of movement in each of the three planes of the skull. Fully Adjustable PROTAR (9) articulator.

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Stansbery tripod articulator
Hanau Kinoscope articulator
Denar II
Denar V

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Records needed for mounting on a Fully Adjustable Articulator
Hinge axis location and Face bow record
Centric Relation Record
Pantographic tracings
Stereographs

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

A- Hinge axis location and Face bow record:
Face bow record has to be made in relation to the actual terminal hinge axis. This should first be located using a Kinematic face bow.
B- Centric Relation Record:
Since the use of such an articulator would be limited to those cases that need full reconstruction and rehabilitation  - It can be done byBut it prefers more sophisticated methods, such as:- Electronic recording techniques- Intraoral gothic arc registration Classic centric records

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Consists of two facebows, one is fixed to the maxilla while the other to the mandible, with the use of clutches that are attached to the teeth.
C- Pantographic tracings
The tracings are made by styli attached to one member and small tables upon which the tracings are drawn attached to the other member, opposite the styli. There are posterior vertical and horizontal tables on both right and left sides.
The patient is instructed to move his mandible through protrusive, right and left lateral excursion movements, while the styli scribe on their opposing tables the paths followed by the condyles in those movements.
When a pantograph is attached to the articulator, adjustments and alterations are made to the movements of the articulator follows the same paths that was scribed by the styli on their tables, that is following the paths of the condyles in their movements.

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Pantograph Computerized systems
Have also been developed. A print out is obtained and used to program the articulator. The computerized systems closely resembles the manual pantograph and are much more economical as regards time, as the transfer stage is eliminated.

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Department of: HERE
D- Stereographs:
Clutches are made to fit the teeth, and the patient is instructed to perform lateral and protrusive excursions, during which, studs in one clutch cut into the opposing one.
For programming the articulator, the clutches are transferred to it, and it is moved to follow along the paths formed by the cut out areas. The condyles of the articulator are made to mold auto-polymerizing resin, previously placed in the articulator fossae. This enables the original jaw movements to be reproduced when the clutches are removed.

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY

Department of: HERE
Summary
The choice of articulator depends upon such factors as; Intended use - Skill of the technician Availability of equipment - Expense Patient's occlusion - Skill of the operator The more closely the articulator matches the patients anatomy, usually the better the outcome and the less adjustment is required at chair-side on fitting prostheses.

THE END

UNIVERSITY OF MOSUL COLLEGE OF DENTISTRY
2020-2021