Dental Tissue Modifications

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Questions and Answers

What is the primary purpose of a post in a damaged tooth?

To strengthen the root against fracture

To increase the radiographic visibility of the root canal

To provide a pleasing esthetic appearance

To provide additional retention for the core and coronal restoration (correct)

What is an ideal property of a post in terms of flexibility?

It should be very stiff and rigid

It should be able to bend permanently without breaking

It should be able to stretch elastically to cushion an impact (correct)

It should be brittle and prone to fracture

What is an important aspect of post design?

Combining the ideal level of flexibility and strength in a narrow-diameter structure (correct)

Maximizing the diameter of the post

Making the post as visible as possible on radiographs

Minimizing the flexibility of the post

What is a common reason for roots to fracture?

The answer is not specified in the text Signup and view all the answers

What is an important mechanical property of a post?

It should be resilient and able to return to its original shape Signup and view all the answers

What is the primary function of a post in terms of the root?

To protect the root from fracture Signup and view all the answers

What occurs when excessive flexing of the post and micromovement of the core happen in teeth with minimal remaining tooth structure?

The crown margins are more likely to open and result in devastating caries or endodontic leakage Signup and view all the answers

What is a consequence of fatigue failure of nonvital teeth restored with a post?

A complete fracture of the root may occur Signup and view all the answers

What is an ideal property of a post in terms of strength?

It should be stiff enough not to distort or bend permanently Signup and view all the answers

Why do teeth with minimal remaining tooth structure lack cervical stiffness?

Because of the missing dentin in the tooth structure Signup and view all the answers

What is a desirable feature of a post system?

A combination of ideal flexibility and strength in a narrow-diameter structure Signup and view all the answers

What is a consequence of post flexion in teeth with minimal remaining tooth structure?

The crown margins will be distorted and potentially open Signup and view all the answers

What is a characteristic of a post placed into a dentin root?

It functions like a structural rod anchored in another material Signup and view all the answers

What is a difference between metallic and fiber posts, as shown in Fig. 22-3?

Fiber posts have less stress buildup in the cervical area Signup and view all the answers

What can be as irreparable as root fracture in teeth with extensive caries?

Caries extending into the root Signup and view all the answers

What is a risk in teeth with minimal remaining tooth structure, particularly with regard to post flexion?

The crown margins will be distorted and potentially open Signup and view all the answers

What is the primary role of adhesion in dental treatment?

To help absorb stresses more evenly throughout the remaining tooth structure Signup and view all the answers

What is the primary consideration for prosthetic requirements in dental treatment?

The need for protective and retentive features Signup and view all the answers

What is the main difference between abutments for fixed or removable partial dentures and single crowns?

The need for more extensive protective and retentive features Signup and view all the answers

What is the benefit of a non-rigid post in structurally sound teeth?

It reduces the transfer of force to the root Signup and view all the answers

Why are fiber posts generally contraindicated in structurally compromised teeth?

Because they can be detrimental to the marginal seal and prosthesis longevity Signup and view all the answers

What is the typical treatment approach for anterior teeth that have lost vitality due to trauma?

Sealing the access cavity and direct composite fillings Signup and view all the answers

What is the relation between post diameter and flexion?

Post diameter is inversely proportional to flexion Signup and view all the answers

What is the primary consideration for selecting the best treatment approach in dental treatment?

The adhesion potential inside the root and post type Signup and view all the answers

What is the preferred method of cementation in highly esthetic ceramic coronal restorations?

Adhesive cementation Signup and view all the answers

What type of posts are used in restorations that require nonmetal esthetic posts?

Ceramic posts Signup and view all the answers

What is the term for the process of creating restorations using computer-aided design and computer-aided machining?

CAD-CAM Signup and view all the answers

What type of restorations can be fabricated using current restorative procedures?

Highly esthetic ceramic coronal restorations Signup and view all the answers

What is the primary reason for restoring a nonvital anterior tooth?

To replace lost tooth structure Signup and view all the answers

What is the term for the process of creating a core and possibly a post to support a crown?

Core and post fabrication Signup and view all the answers

What type of teeth require restoration with a crown, supported and retained by a core and possibly a post?

Structurally compromised teeth Signup and view all the answers

What is the term used to describe the process of preparing the occlusal anatomy of a tooth for restoration?

Occlusal reduction Signup and view all the answers

What is the primary effect of chelators on root dentin?

Depletion of calcium by complex formation Signup and view all the answers

What is the result of sodium hypochlorite's proteolytic action on dentin?

Fragilization of dentin and root structure Signup and view all the answers

What is the primary influence of tissue modifications on tooth biomechanics?

Restorative approach and means Signup and view all the answers

What is the effect of the loss of pulpal vitality on tooth moisture content?

A slight change in moisture content Signup and view all the answers

What is the primary purpose of canal irrigation and disinfection in endodontic therapy?

To interact with root dentin and remove organic substrate Signup and view all the answers

What is the likely outcome of dentin erosion and softening caused by chelators?

Fragilization of dentin and root structure Signup and view all the answers

What is the focus of in vitro studies dealing with nonvital tooth substrates?

To understand the complexity of the nonvital tooth substrate Signup and view all the answers

What is the relationship between the loss of pulpal vitality and the outcome of restorative treatments?

The loss of pulpal vitality affects the restorative approach and means Signup and view all the answers

Study Notes

Characteristics of Nonvital Teeth

Loss of tooth structure and discoloration can occur due to tissue modifications
Tooth composition, dentin microstructure, and tooth macrostructure must be analyzed to understand the impact on tooth biomechanics

Effects of Endodontic Therapy

Sodium hypochlorite and chelators can interact with root dentin, affecting mineral content and organic substrate
Chelators can deplete calcium, leading to dentin erosion and softening
Sodium hypochlorite can cause proteolytic action, fragmenting collagen and leading to dentin fragility

Ideal Post Characteristics

Maximal protection of the root from fracture
Maximal retention within the root and retrievability
Maximal retention of the core and crown
Maximal protection of the crown margin seal from coronal leakage
Pleasing esthetics, when indicated
High radiographic visibility
Biocompatibility

Post Flexibility and Strength

An ideal post would combine flexibility, stiffness, and strength to cushion impact and reduce stress to the root
Current post systems aim to provide the best compromise between desired properties and material limitations

Why Roots Fracture

Early failure can result in significant leakage of crown margins
Fatigue can cause endodontic posts to bend permanently or break, leading to root fracture
Extensive caries extending into the root can be as irreparable as root fracture

Post Placement and Adhesion

A well-bonded post can help absorb stresses more evenly throughout the remaining tooth structure
Adhesion plays a crucial role in reducing the risk of fissure and fracture
Nonrigid posts flex with the tooth under functional forces, reducing the transfer of force to the root

Anterior Teeth

Structurally sound anterior teeth may not require a crown, core, or post
Restorative treatment is limited to sealing the access cavity and direct composite fillings
Structurally compromised anterior teeth require restoration with a crown, supported and retained by a core and possibly a post

Posterior Teeth

Structurally compromised posterior teeth require more extensive protective and retentive features due to greater transverse and torquing forces
Nonmetal esthetic posts, either ceramic or resin fiber-reinforced, are often used in posterior restorations

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Description

This quiz covers the analysis of dental tissue modifications at different levels, including tooth composition and structure, and the effects of various chemicals like sodium hypochlorite and chelators.