Dental Composite Resins and Tooth Color

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Questions and Answers

What is a significant problem for the long-term success of contemporary composite resins?

Shrinkage during polymerization (correct)

Biochemically altered dentin

Thin gingival tissue

Food and drink pigment penetration

What is the role of hemoglobin in dentin?

Reduces shrinkage stresses during polymerization

Modifies tooth color and appearance

Triggers food and drink pigment penetration

May play an important role in color change (correct)

What is the C-factor in dentistry?

A type of composite resin restoration

A measure of tooth color and appearance

A clinically relevant predictor of the risk of debonding and leakage (correct)

A factor in food and drink pigment penetration

What is the indication for a direct composite restoration?

When only one proximal surface of the tooth has been lost Signup and view all the answers

What is the effect of pulpal pressure on tooth color and appearance?

Prevents discoloration Signup and view all the answers

What is the effect of biochemically altered dentin on tooth color and appearance?

Modifies tooth color and appearance Signup and view all the answers

Why is thin gingival tissue considered a negative factor for esthetic outcome?

It is a negative factor for esthetic outcome of restorative and prosthetic treatment of discolored teeth Signup and view all the answers

What is the purpose of using an incremental filling technique?

To reduce shrinkage stresses during polymerization Signup and view all the answers

What is the primary advantage of using resin-modified glass ionomer materials as a core material?

Moderate strength and bonding to dentin similar to composite resin Signup and view all the answers

What is the primary reason for the failure of composite cores?

Loosening of the post and core Signup and view all the answers

What is the typical failure rate of fiber posts and cores after a service period of 7 to 11 years?

Between 7% and 11% Signup and view all the answers

What is the advantage of using light-curing composite core materials?

Eliminates the risk of chemical incompatibility Signup and view all the answers

What is the primary advantage of using resin composites for core fabrication?

Has replaced glass ionomer materials for core fabrication Signup and view all the answers

What is the primary advantage of cast metal post and core?

Has been the traditional method for many years Signup and view all the answers

What is the primary reason for bonding light-cured resin composites to the pulp chamber and canal orifices?

To eliminate the need for a post when sufficient tooth structure remains Signup and view all the answers

What is the primary advantage of using metal posts compared to amalgam or gold cores?

Provides some protection from root fracture in teeth Signup and view all the answers

What happens when a fiber post/composite foundation fails?

Severe untreatable root fractures occur Signup and view all the answers

What is the primary location of functional stresses in a fiber post/composite foundation?

Cervical area around the post Signup and view all the answers

Why is a ferrule necessary in a fiber post/composite foundation?

To provide additional retention and resistance Signup and view all the answers

What determines the pattern of stress transmission from the post to the root dentin?

The modulus of elasticity of the post and dentin Signup and view all the answers

What happens when the modulus of elasticity of the post is higher than that of the dentin?

Stress concentration is adjacent to the bottom of the post Signup and view all the answers

What is the primary purpose of restorations of endodontically treated teeth?

All of the above Signup and view all the answers

What is the outcome of a root fracture originating at the apex of a rigid post?

Severe untreatable root fractures Signup and view all the answers

What is a common requirement for a post, regardless of its material or design?

Retention and resistance Signup and view all the answers

What is the effect of MOD cavities on the fracture resistance of endodontically treated teeth?

It decreases the fracture resistance by 69% Signup and view all the answers

What is the reason for the large number of post designs and materials available on the market?

Manufacturers and clinicians have different opinions on the most important properties Signup and view all the answers

Why may a direct composite restoration not be appropriate for endodontically treated teeth with MOD cavities?

Because it is not strong enough to prevent fracture Signup and view all the answers

What is the benefit of using resin composite materials for restorations of endodontically treated teeth?

They reduce the risk of periodontal bone resorption Signup and view all the answers

What is the benefit of using in vitro fiber-reinforced composite restorations for endodontically treated teeth?

They represent a valuable alternative to conventional restorations Signup and view all the answers

What is the effect of inserting an in vitro fiber post in the root canal of an endodontically treated tooth?

It decreases the fracture resistance of the tooth Signup and view all the answers

When is a full crown restoration of choice for an endodontically treated tooth?

When a significant amount of coronal tooth structure has been lost Signup and view all the answers

What is the main reason why resin composite materials may require the use of reinforcing fibers?

To increase their mechanical resistance Signup and view all the answers

What is the primary purpose of a post in a nonvital anterior tooth?

To retain and support the crown Signup and view all the answers

What type of posts are used in nonvital anterior teeth restorations?

Nonmetal esthetic posts Signup and view all the answers

What is the primary advantage of ceramic coronal restorations?

Highly esthetic with lifelike color and vitality Signup and view all the answers

What is the preferred method of cementation in nonvital anterior teeth restorations?

Adhesive cementation Signup and view all the answers

What is the primary purpose of a core in a nonvital anterior tooth?

To restore tooth structure Signup and view all the answers

What is the primary advantage of CAD-CAM restorations?

Increased accuracy Signup and view all the answers

What is the primary purpose of etching in ceramic restorations?

To improve bonding Signup and view all the answers

What is the primary material used in structurally compromised anterior teeth restorations?

Ceramic Signup and view all the answers

Study Notes

Opaque Substances and Tooth Color

Opaque substances affect the color and translucency of uncrowned teeth
Biochemically altered dentin modifies tooth color and appearance
Organic substances in dentin (e.g., hemoglobin) may contribute to color change
Food and drink pigment penetration, triggered by the absence of pulpal pressure, also affect tooth color

Incremental Filling Technique

Reduces shrinkage stresses during polymerization
Recommended for long-term success of composite resin restorations
C-factor (ratio of bonded to unbonded surfaces) is a predictor of debonding and leakage risk
High C-factors (>3.0) increase the risk of debonding

Restoration of Endodontically Treated Teeth

Restorations are designed to protect the remaining tooth from fracture, prevent reinfection, and replace missing tooth structure
Thin gingival tissue or thin biotype is a negative factor for esthetic outcome
Direct composite restorations may be indicated for single proximal surface loss
Incremental filling technique is mandatory for these restorations

Fiber-Reinforced Composite Restorations

May represent a valuable alternative to conventional restorations
In vitro fiber-reinforced composite restorations may increase mechanical resistance
Inserting an in vitro fiber post in the root canal before bonding a direct MOD restoration reduces its fracture resistance

Full Crowns

May be the restoration of choice for significant coronal tooth structure loss
Protects the coronocervical structures but may result in severe, untreatable root fractures if failed
The presence of a ferrule is mandatory

Posts and Core Materials

Posts can be fabricated from metal, ceramic, or fiber-reinforced resins
Retention and resistance are key properties for posts
Resin-modified glass ionomers have moderate strength and are suitable for moderate-sized buildups
Composite core materials are typically two-paste, self-cured composites, but light-curing materials are also available
Light-curing composite core materials eliminate the risk of chemical incompatibility between adhesives and self-curing resin core materials

Indirect Foundation Restorations

Cast post and core has been a popular choice for many years
Adhesive cementation is preferred to conventional cementation for indirect foundation restorations

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Description

This quiz explores the effects of opaque substances on tooth color and translucency in composite resin restorations. It also discusses the role of dentin modification and incremental filling techniques in minimizing shrinkage stresses during polymerization.