Prosthodontics Study Notes - Sheet #13
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Questions and Answers

What corrective action should be taken if an error is caused by a high cusp?

  • Grind/deepen the fossae (correct)
  • Grind the cusp inclined
  • Polish the cusp surface
  • Adjust the occlusion to a neutral position

Which of the following conditions would require the grinding of the cusp inclined?

  • Lateral shift errors (correct)
  • Inadequate contact points
  • Excessive wear on the occlusal surface
  • High cusp errors

What is the purpose of grinding the fossae?

  • To compensate for high cusps (correct)
  • To correct lateral shifts
  • To adjust the occlusal force distribution
  • To enhance the aesthetic appearance

If a dental adjustment is needed due to a buccal shift, what should be performed?

<p>Grind the cusp inclined (B)</p> Signup and view all the answers

Which procedure is aimed at correcting an issue related to a lateral shift?

<p>Grinding the cusp inclined (D)</p> Signup and view all the answers

What was done to the master casts before they were plastered to the articulator?

<p>Location grooves were cut into each cast. (B)</p> Signup and view all the answers

Why was petroleum jelly applied to the master casts?

<p>To prevent adhesion of the casts to the plaster. (B)</p> Signup and view all the answers

What was the purpose of cutting location grooves into the master casts?

<p>To help in the alignment during processing. (B)</p> Signup and view all the answers

What is the expected benefit of detaching the master casts from the topping plaster?

<p>To expedite the processing time. (A)</p> Signup and view all the answers

In what areas was petroleum jelly applied on the master casts?

<p>To the location grooves and peripheral areas. (D)</p> Signup and view all the answers

What should be ground if the anterior teeth have heavy contact but the posterior teeth have no contact?

<p>Labial surface of the lower anterior teeth (C)</p> Signup and view all the answers

Which surface of the upper anterior teeth is ground to correct heavy contact with the anterior teeth?

<p>Palatal surface (B)</p> Signup and view all the answers

Why is it necessary to adjust protrusive relations in dental occlusion?

<p>To maintain proper jaw alignment and function (C)</p> Signup and view all the answers

Which of the following describes a situation necessitating adjustment of tooth surfaces?

<p>Heavy anterior contact with posterior teeth separated (C)</p> Signup and view all the answers

What type of contact occurs on the posterior teeth when there is heavy contact on the anterior teeth?

<p>Separation (B)</p> Signup and view all the answers

What is the purpose of creating indices on the master cast during the mounting process?

<p>To facilitate the separation during the flasking procedure (C)</p> Signup and view all the answers

Why is it important to keep the mounting and articulator in the same relationship after separating the master cast?

<p>To maintain consistent occlusal relationships (A)</p> Signup and view all the answers

What is the first step after finishing the occlusal relationship between the two wax rims?

<p>Performing the mounting process (C)</p> Signup and view all the answers

What is the main benefit of using wax rims in dental procedures?

<p>They help in establishing the occlusal relationship (D)</p> Signup and view all the answers

What is typically done with the master cast before the flasking procedure begins?

<p>It is separated according to existing indices (A)</p> Signup and view all the answers

What should be avoided during the milling process?

<p>Using excessive force or pressure (A)</p> Signup and view all the answers

What must be done with carborundum after milling is completed?

<p>All traces must be removed (C)</p> Signup and view all the answers

What is the final step after grinding the surfaces of the teeth?

<p>Polishing the ground surfaces (C)</p> Signup and view all the answers

Which stroke technique is recommended during the milling procedure?

<p>Light and gentle strokes (C)</p> Signup and view all the answers

What should be ensured about the tooth surfaces after grinding according to the guidelines?

<p>They need to be polished (B)</p> Signup and view all the answers

What is the primary role of the maxillary palatal cusps and the mandibular buccal cusps?

<p>To maintain the recorded vertical dimension (D)</p> Signup and view all the answers

Which of the following statements about cusps is accurate?

<p>Palatal and buccal cusps both contribute to jaw functionality (A)</p> Signup and view all the answers

What might happen if the maxillary palatal and mandibular buccal cusps are not functioning properly?

<p>Vertical dimension may be compromised (A)</p> Signup and view all the answers

How do the maxillary palatal cusps influence dental occlusion?

<p>They significantly affect occlusal contact and vertical dimension (D)</p> Signup and view all the answers

Which pair of cusps are specifically mentioned for their role in vertical dimension?

<p>Maxillary palatal and mandibular buccal cusps (A)</p> Signup and view all the answers

Flashcards

Location Grooves

Grooves cut into the plaster casts before mounting them on the articulator.

Petroleum Jelly Film

A thin layer of petroleum jelly applied to the location grooves and the edges of the casts.

Topping Plaster

A type of plaster used for mounting the casts on the articulator.

Mounting

The process of attaching the casts to the articulator.

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Master Cast Detachment

The technique of easily removing the casts from the plaster after processing.

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Mounting the Master Cast

The process of securing the master cast to the articulator, maintaining the same occlusal relationship achieved with the wax rims.

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Indices on the Master Cast

Small, identifiable marks placed on the master cast to aid in separating it from the articulator during the flasking procedure.

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Flasking Procedure

The procedure of preparing the master cast and denture base for the creation of a mold, which will be used to produce a denture.

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Separating the Master Cast

The process involved in removing the master cast from the articulator, preserving the occlusal relationship established with the wax rims.

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Preserving the Articulator Relationship

The act of maintaining the same positional relationship between the master cast and articulator after separating the trial denture.

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Deepening Fossae

Grinding the grooves of a tooth cusp deeper to correct a high cusp error.

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Grinding Inclined Cusp

Grinding the inclined surface of a tooth cusp to correct a lateral or buccal/lingual shift error.

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Cusp Modification

The process of adjusting the shape and height of tooth cusps to correct occlusion problems. It's often used during crown preparation.

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High Cusp Error

A problem in tooth alignment where a cusp is too high, interfering with the smooth closing of the jaw.

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Lateral, Buccal/Lingual Shift Error

An error in occlusion where a tooth is shifted to one side (lateral) or towards the cheek (buccal) or tongue (lingual) side.

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Vertical dimension

Maxillary palatal cusps and mandibular buccal cusps play a crucial role in maintaining the vertical dimension of occlusion, also known as the height between the upper and lower teeth when biting.

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Adjusting Protrusive Relations

A technique used to adjust the relationship between upper and lower teeth, specifically addressing protrusive contacts. This involves grinding the labial surface of the lower anterior teeth and the palatal surface of the upper anterior teeth to create separation in the posterior teeth during protrusive movements.

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Heavy Anterior Contact

This occurs when the anterior teeth make heavy contact during protrusive movements, but the posterior teeth do not touch or are separated.

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Supporting cusps

The maxillary palatal cusps and mandibular buccal cusps are called the supporting cusps .

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Grinding Labial Surface of Lower Anteriors

A specific grinding technique done on the outer surface of the lower anterior teeth. This helps to adjust the protrusive relationship by reducing contact.

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Why are maxillary palatal and mandibular buccal cusps important?

The maxillary palatal cusps and mandibular buccal cusps are critical for maintaining the correct vertical dimension, preventing teeth from shifting, and ensuring proper function of the bite.

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Maxillary palatal cusps

Maxillary palatal cusps are located on the upper jaw (maxillary) and are on the roof of the mouth (palatal) side of the teeth.

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Grinding Palatal Surface of Upper Anteriors

Grinding done on the inner surface of the upper anterior teeth. This helps to adjust the protrusive relationship by reducing contact and allowing for movement in the posterior teeth.

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Mandibular buccal cusps

Mandibular buccal cusps are located on the lower jaw (mandibular) and are on the cheek side (buccal) of the teeth.

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Protrusive Occlusal Harmony

Aim is to create a smooth and even contact between the upper and lower teeth during protrusive movements, with no excessive force or discomfort.

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Tooth Grinding: Polishing

Polishing the ground surfaces of teeth after grinding is crucial for a smooth, finished product.

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Tooth Shaping: Light Strokes

Applying minimal pressure while shaping teeth with tools like carborundum is essential for avoiding damage.

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Tooth Grinding: Carborundum Removal

Removing any leftover carborundum particles after grinding is vital for a clean and accurate result.

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Tooth Grinding: Polishing Purpose

Creating a smooth surface on teeth after grinding helps prevent irritation and improves the overall appearance.

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Tooth Grinding: Precision & Polishing

Achieving a high standard of finishing requires both careful grinding and thorough polishing.

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Study Notes

Prosthodontics Study Notes

  • Sheet #13: Part of a larger course or textbook on prosthodontics.
  • Topics Covered: Laboratory remount, selective grinding, finishing the denture, complete denture clinical/lab steps, sources of occlusal errors, processing errors, remounting (lab and clinical), and advantages.
  • Authors/Editors: Asma'a Abu-Qtaish, Lajneh Teejan, and Rasha Alomoush
  • Date: 2022

Processing Errors

  • Denture Expansion: Investing material expansion during processing can increase the vertical dimension of occlusion (VDO).
  • Polymerization Shrinkage: Resin shrinkage during the processing (deflasking) may cause internal stresses.
  • Heat Generation: Heat generated during finishing and polishing can cause tooth movement.
  • Excessive Packing: Excessive pressure during processing can force teeth into plaster, leading to movement.

Sources of Occlusal Errors

  • TMJ Changes: Changes in Temporomandibular Joint (TMJ) state can affect occlusal records.
  • Interocclusal Records: Inaccurate records by the dentist.
  • Articulator Errors: Errors in transferring relations to the articulator.
  • Record Bases: Ill-fitting record bases.
  • Vertical Dimension Changes: Incorrect vertical dimension at the articulator.
  • Wax Dimensional Changes: Wax isn't dimensionally stable after setting up, this should be slight if occlusion of wax-up is carefully examined before flasking..

Remounting

  • Laboratory: Performed after deflasking before handing the dentures to the patient.
  • Clinical: Done using new recordings from the patient and new mounting.
  • Purpose: To bring back pre-processing vertical dimension (VDO) and reset incisal pin contacts.

Selective Grinding

  • Purpose: Eliminates errors caused by processing.
  • Procedure: Modification of occlusal surfaces of teeth using selective grinding.
  • Considerations: Selective grinding doesn't correct errors from impressions or jaw relation records, mounting, or errors during polishing.

Obtaining Even Contact in Centric Occlusion

  • Procedure:
    1. Lock upper arm of articulator in centric relation and check occlusion.
    2. Loosen locks, move denture for eccentric movements.
  • Cusp Correction: If cusp is high: deepen the opposing fossa.
  • Uniform Contact: Ensure uniform contact on posterior teeth in centric occlusion.

Adjusting Protrusive Relations

  • Posterior Contact: Grind labial surface of lower anterior and palatal surface of upper anterior if anterior teeth contact heavily with no posterior contact/separation.
  • Maxillary/Mandibular Cusps: Reduce distal inclines of maxillary cusps and mesial inclines of mandibular cusps if heavy posterior contact exists but no anterior contact.

Finishing the Denture

  • Carborundum Paste: The articulator is moved using carborundum paste for smoothing the gliding surface of the teeth.
  • Milling: Must be done lightly to prevent losing balancing contacts, potentially decreasing vertical dimension.
  • Removing Sharpness: Blebs are removed carefully using a discoid carver or mounted rubber points (polishing).
  • Polishing: External surfaces are polished using wet rag wheels.

References

  • Specific chapters from textbooks are listed.

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Description

This quiz covers essential topics in prosthodontics including laboratory remounting, selective grinding, and finishing complete dentures. It explores various sources of occlusal errors, processing errors, and their implications on denture quality. Prepare for advanced studies in prosthodontic techniques with these study notes.

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