Occlusal Transfer Techniques in Dentistry

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a sign that the mounting process may have errors?

The occlusal rims are identical in size.

The mandibular cast is larger than the maxillary cast.

The incisal pin does not touch the incisal table. (correct)

The midline of the maxillary cast is perfectly aligned with the midline of the articulator.

Which action helps ensure proper alignment when mounting casts?

Inverting the articulator with the mounted maxillary cast. (correct)

Aligning the incisal pin with the incisal table.

Checking for interference between the casts.

Securing the record base to the mandibular cast.

What potential issue can arise from the incorrect mounting of casts?

The facial appearance is improved.

The cast will become lighter in weight.

The occlusal relationship is accurate.

Posterior interference between casts may occur. (correct)

Which of the following is NOT a cause of error during the mounting of casts?

Securing occlusal rims properly after making a centric record. Signup and view all the answers

What should be checked to confirm proper mounting accuracy?

Centralization of the lower cast based on the maxillary cast. Signup and view all the answers

What is the primary purpose of mounting casts to an articulator?

To maintain the vertical dimension of occlusion Signup and view all the answers

Which type of record uses the facebow fork in dentate patients?

Static record Signup and view all the answers

What is the role of the pantographic tracing in dynamic records?

To offer a graphic record of mandibular movement Signup and view all the answers

Why should the casts be coated with a separating medium before scoring?

To facilitate easy removal of casts after mounting Signup and view all the answers

What should be the condition of the articulator before mounting the casts?

It should be clean Signup and view all the answers

How deep should the index cuts on the base of the casts be during scoring?

1/4 inch Signup and view all the answers

Which characteristic is associated with static records?

They provide the position of the maxilla in relation to the hinge axis Signup and view all the answers

What is the significance of keeping the incisal guide table at zero degrees during mounting?

To align the casts properly Signup and view all the answers

What is the purpose of cleaning the mean value articulator before use?

To prevent contamination from previous materials Signup and view all the answers

Which of the following steps is NOT involved in mounting using a facebow?

Apply plaster to the base of the cast Signup and view all the answers

During the process of mounting the upper and lower casts, what needs to be properly aligned?

The midline of the maxillary occlusion rim with the cross midline Signup and view all the answers

What is a primary reason for making cuts on the base of upper and lower casts?

To enhance adhesion of the mounting material Signup and view all the answers

What should be done if there is insufficient space between the base of the cast and the upper member of the articulator?

Trim the base of the cast to create more space Signup and view all the answers

When securing the bite fork, which two rods must be secured to prevent torque?

Horizontal and vertical rods Signup and view all the answers

What is the key factor for the incisal pin to give a zero reading?

The pin positioned level with the upper member of the articulator Signup and view all the answers

What should be checked for once the bite fork and facebow are removed?

The security of the attachments Signup and view all the answers

Study Notes

Introduction to Occlusal Transfer

Accurate jaw relation recording is crucial for dental restorations.
This ensures proper function, facial appearance, and oral health.
Accurate mounting is important for both dentists and dental technicians.
It minimizes treatment time and ensures proper fit of indirect restorations.

Mounting

Mounting involves attaching the maxillary or mandibular cast to an articulator (or similar tool).
Key roles of mounting:
- Maintaining vertical dimension of occlusion.
- Maintaining horizontal centric jaw relation.
- Facilitating arrangement of artificial teeth.

Types of Records

Static Record

This record shows the position of the maxilla relative to the hinge axis (that joins both condyles).
Facebow forks help record maxillary occlusal surfaces.
Various media are used to capture the information.

Interocclusal Record

This records the relationship of opposing teeth or arches to each other.
Includes:
- Centric relation record
- Maximum intercuspation record
- Eccentric records

3-Dynamic Record

Stereographic

Allows for custom-made condylar fossa moldings for each patient.

Pantographic

A graphic record of mandibular movement.
Recorded in horizontal, sagittal, and frontal planes.
Registered physically by styli tracing on recording tables or by electronic means.

Scoring the Cast

Plaster knife or laboratory handpiece with a metal round bur are used to make 3-4 V-shaped cuts on the cast base.
This forms a mounting index for remounting the cast after constructing the final denture.
Cuts are about 1/4 inch deep and 1/2 inch wide.
The casts' base and the cuts are coated with Vaseline or another separating medium.

Steps for Mounting

Clean the articulator.
Ensure the incisal pin is aligned with the upper member of the articulator.
Adjust the incisal guide table to zero degree.
Securely attach the mounting table to the articulator.
Locate the midline of the cast.
Create three or four cuts in the upper and lower casts' base using a wax knife.

According to Type of Articulators

Clean the articulator from any remnants of previous plaster.
Position the incisal pin correctly to produce a zero reading.
Securely affix the mounting table to the articulator.

Mounting the Upper Cast

Use a face bow record.
Use a Bonwill triangle.

Mounting with Face-bow

Identify anterior and posterior reference points.
Prepare the bite fork and occlusion rim.
Position the bite fork centered on the arch (indexed to the teeth with wax or elastomer).
Secure the facebow over the bite fork rod (anteriorly).
Position the facebow into the ear (posteriorly).
Secure the facebow (anteriorly).

Mounting with Face-bow - Continued

Position the bow anteriorly to the third reference point (horizontal plane).
Secure the bite fork vertical rod, then the horizontal rod.
Release the bow anteriorly to separate it from the ears.
Remove the fork from the mouth.
Ensure the attachments are secure.

Technique for Interocclusal Record

The technique ensures clear imprints without perforation.

Condylar Guidance Adjustment

Adjustment is made to ensure the assembly matches the mouth’s occlusion rims and protrusive records.
Lateral guidance is adjusted matching the occlusion rims and protrusive record.

After Recording Jaw Relation

Ensure sufficient space between the cast base and the upper member of the articulator.
If space is insufficient, trim the cast.
Align the maxillary occlusion rim midline with the mounting table center.

Mounting the Lower Cast

Mount the mandibular cast after recording the vertical and centric jaw relations.
Securely attach the mandibular occlusion rim.
Seal between maxillary and mandibular rims.
Ensure there are no posterior interferences between the casts.
Carefully invert the mounted maxillary cast to mount the mandibular cast.
Position the maxillary and mandibular occlusal rims (centric record) on the maxillary cast.

Checking Mounting

Ensure the maxillary cast midline coincides with the mandibular cast midline and the articulator midline.
Ensure the maxillary cast is appropriately centered on the articulator.
Confirm the incisal pin doesn't contact the incisal table.
Check for any contact between the maxillary and mandibular casts in the healer's area.

Errors During Mounting

Improper record base attachment.
Interference between casts (posteriorly).
Incisal pin misalignment.
Loosely screwed incisal pin.
Incorrect midline transfer.
Movement of casts during mounting.
Improper maxillary and mandibular rim fixation.
Dimensional changes in the plaster.
Defective face-bow record.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz covers the principles of occlusal transfer, focusing on accurate jaw relation recording necessary for effective dental restorations. Participants will explore mounting techniques and the types of records used in maintaining occlusion and denture arrangement. Assess your understanding of occlusal relationships and their significance in dental practice.