Understanding Movement in Edentulous Patients

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Which of the following is NOT a factor that can cause variation in registrations of protrusive and lateral relations?

The angle and lines of the bony fossa (correct)

The attachments of the ligaments

The biting load during movement

The shape of the fossa

What is the purpose of a protrusive registration?

To determine the shape and function of the meniscus

To study the anatomy and function of the joint

To attain a normal comfortable movement of the condyle (correct)

To control the path of the condyle

When should the opposing teeth fit into the indentations in the trial dentures?

Only anteriorly and posteriorly

Only posteriorly and laterally

Only laterally and vertically

Anteriorly, posteriorly, laterally, and vertically (correct)

What should be used to verify the accuracy of the mounting on the articulator if the initial registration was made in wax?

Wax Signup and view all the answers

Which of the following factors is NOT considered when determining the vertical dimension of occlusion?

The amount of interocclusal distance between the teeth in rest position Signup and view all the answers

What is the purpose of verifying the centric relation (CR)?

To check the intercuspation of the teeth Signup and view all the answers

What is the purpose of the tentative observation of the centric occlusion (CO)?

To reveal errors in CR by the touch and slide of teeth on each other Signup and view all the answers

What should be done if the denture border causes binding of the maxillary labial frenum?

Deepen the labial notch Signup and view all the answers

Which of the following is the purpose of the extraoral method described in the text?

To determine the position of the teeth on the articulator Signup and view all the answers

What is the recording medium used in the extraoral method described in the text?

Impression material Signup and view all the answers

Why is no wax placed on the anterior teeth in the extraoral method described in the text?

Anterior tooth contact tends to cause the patient to protrude their lower jaw Signup and view all the answers

What is the critical temperature and time for achieving uniformly softened wax in the extraoral method described in the text?

130°F (54°C) for 30 seconds Signup and view all the answers

Which factor controls the movement of the mandible in edentulous patients?

The incisal guidance provided by the anterior teeth Signup and view all the answers

What is the purpose of eccentric relation records in the fabrication of complete dentures?

To simulate jaw movement mechanically Signup and view all the answers

Which method can be used to register the condyle path intraorally?

Plaster and carborundum grind-in Signup and view all the answers

When should plaster interocclusal records be made in the fabrication of complete dentures?

After both CR and the vertical dimension have been verified Signup and view all the answers

Which of the following is NOT true about the touch and slide observation during the mounting process?

It is used to determine the correct positioning of the anterior teeth Signup and view all the answers

What is the purpose of the vertical overlap measurement of the anterior teeth?

To guide the amount of closure permitted in the next interocclusal record Signup and view all the answers

Why is visual observation alone not reliable for determining cast mounting accuracy?

Complete dentures rest on movable soft tissues Signup and view all the answers

What is the purpose of using impression plaster or interocclusal registration paste during the interocclusal record process?

To correct an error in the preliminary mounting of casts Signup and view all the answers

Which type of interocclusal records are more difficult to secure accurately and reproducibly for patients with complete dentures?

Lateral records Signup and view all the answers

What is one reason why it is generally accepted that making lateral interocclusal records for patients with complete dentures is not practical?

The displaceability of the ridge mucosa Signup and view all the answers

How can the amount of protrusive movement be determined when making eccentric interocclusal records?

By observing the distance of the needle point from the apex of the tracing Signup and view all the answers

What is the purpose of extraoral tracings when making eccentric interocclusal records?

To secure accurate and reproducible records Signup and view all the answers

Why are most semiadjustable articulators not able to accept many lateral eccentric records?

Due to the limitations of the articulator design Signup and view all the answers

Which type of interocclusal records are considered more practical and warranted for patients with complete dentures?

Protrusive records Signup and view all the answers

Which approach can be taken to ensure that the soft tissues of the basal seat are in the same form as when the final impressions were made?

Relining existing dentures with a soft temporary material Signup and view all the answers

Why is it important to test and verify the accuracy of jaw relation records?

To ensure the appearance and comfort of the patient Signup and view all the answers

What mental attitude should the dentist have when attempting to perfect and verify jaw relation records?

Assuming the preliminary records are incorrect Signup and view all the answers

What is the recommended minimum duration for leaving existing dentures out of the mouth before perfecting and verifying jaw relation records?

24 hours Signup and view all the answers