Tooth Preparation Concepts and Final Impressions: Do’s and Don’ts

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Questions and Answers

Why is careful attention to every detail imperative during tooth preparation?

To avoid irreversible damage to the teeth (correct)

To reduce the time required for tooth preparation

To promote the health of the oral tissues

To allow for regenerative ability of the teeth

Which of the following principles of tooth preparation may lead to failure in another area?

Biologic considerations only

Esthetic considerations only

Mechanical considerations only

Striving for perfection in one area (correct)

What may happen if too much tooth structure is removed to accommodate greater thickness of porcelain for esthetic reasons?

The appearance of the patient is not affected

The pulpal tissue may be damaged (correct)

The integrity and durability of the restoration are improved

The regenerative ability of the teeth is enhanced

What is the optimum tooth preparation a best combination of compromises among?

Biologic, mechanical, and esthetic considerations Signup and view all the answers

What is the most important consideration for saliva control during impression making?

Placing cotton rolls to the buccal and lingual site of the teeth to be impressed and keeping suction in place Signup and view all the answers

Why must periodontal disease be treated and resolved before fabricating a fixed prosthesis?

To avoid plaque accumulation leading to a localized inflammatory response Signup and view all the answers

What should be done if the provisional restoration is poorly contoured or has defective margins?

Fabricate and cement a properly adapted and well-contoured polished provisional Signup and view all the answers

Why is it important to maintain a dry field during impression making?

To eliminate any air bubbles in the impression Signup and view all the answers

What is the purpose of using diagnostic models in tray selection for impression making?

To select the proper size tray Signup and view all the answers

Why should the surrounding soft tissues be reevaluated after tooth preparation and use of provisional restoration?

To ensure they return to a state of optimum health before impression making Signup and view all the answers

Why should attention be shifted from the teeth to the soft tissues if the provisional restoration is poorly contoured or has defective margins?

To avoid plaque accumulation leading to a localized inflammatory response Signup and view all the answers

What should be done if there is bleeding during impression making?

Use viscostat to stop bleeding Signup and view all the answers

What is the primary purpose of using a thin, tapered diamond bur for dental preparations?

To preserve tooth structure and minimize excessive reduction Signup and view all the answers

How can pulp morphology and size be assessed?

Radiographically Signup and view all the answers

Which type of burs are used for reducing occlusal surfaces and preserving anatomical occlusal anatomy?

Occlusal reduction burs Signup and view all the answers

What is the critical consideration when reducing the buccal surface using a bur?

Following the buccal wall of adjacent teeth Signup and view all the answers

Which type of bur is used for creating an anatomical concave surface on the palatal/lingual surface of anterior teeth?

Football bur Signup and view all the answers

What should be avoided during proximal preparation to avoid damaging adjacent teeth?

Contacting the adjacent tooth Signup and view all the answers

What must be properly evaluated for successful tooth preparation and fixed partial denture fabrication?

Common path of insertion for multiple abutments Signup and view all the answers

Why is under-preparing teeth at the first appointment important in cases of multiple abutments?

To allow for refinement of preparations without overpreparation Signup and view all the answers

What is a crucial prerequisite for final impressions in preparation for fixed partial dentures?

Tissue health Signup and view all the answers

What should be considered when preparing teeth with minimum taper to conserve tooth structure?

Convergence angle (taper), retention, and resistance Signup and view all the answers

What type of burs are used to reduce occlusal surfaces while preserving anatomical occlusal anatomy?

Occlusal reduction burs Signup and view all the answers

Study Notes

Thin, tapered diamond bur used for dental preparations to preserve tooth structure and minimize excessive reduction or angulation of soft tissues, including the pulp, tongue, and cheek.
Pulp morphology and size decrease with age, assessed radiographically.
Biological and mechanical considerations in tooth preparation to conserve tooth structure: use partial-coverage restorations, prepare teeth with minimum taper, orthodontically reposition teeth, and avoid unnecessary apical extension.
Mechanical considerations for tooth preparation include convergence angle (taper), retention, and resistance.
Occlusal reduction burs (occlusal reduction bur, football bur, chamfer bur) used for reducing occlusal surfaces and preserving anatomical occlusal anatomy. Central fossa is critical, and reduction should follow anatomical contours.
Buccal surface reduction (chamfer or shoulder bur) requires holding the bur parallel to the long axis of the root and preparing the buccal surface, following the buccal wall of adjacent teeth.
Palatal/lingual surface reduction for anterior teeth requires football bur for creating an anatomical concave surface, and attention should be paid to evaluating the amount of reduction during occlusion.
Proximal surface reduction requires careful preparation to avoid damaging adjacent teeth, with attention paid to breaking contact with the very thin chamfer or flame bur.
Margin preparation involves using chamfer or shoulder burs and preferred finish lines to avoid creating unsupported enamel or open margins.
General rules for tooth preparation include not contacting the adjacent tooth during proximal preparation, placing margins on tooth structure, not tilting the bur during margin refinement, and not removing existing fillings before finishing the preparation.
Proper evaluation of tooth structure, root anatomy, and common path of insertion for multiple abutments is crucial for successful tooth preparation and fixed partial denture fabrication.
Under-preparing teeth at the first appointment when multiple abutments will be prepared allows for refinement of preparations and creation of a proper path of insertion without overpreparation.
Preparation for fixed partial dentures requires consideration of tissue health as a prerequisite for final impressions.

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Description

Learn about the principles of tooth preparation and final impressions in dentistry, and understand the importance of careful attention to detail due to the irreversible nature of the process. This quiz covers biologic and mechanical considerations essential for the health and durability of oral tissues.