40 Questions
What is a significant problem for the long-term success of contemporary composite resins?
Shrinkage during polymerization
What is the role of hemoglobin in dentin?
May play an important role in color change
What is the C-factor in dentistry?
A clinically relevant predictor of the risk of debonding and leakage
What is the indication for a direct composite restoration?
When only one proximal surface of the tooth has been lost
What is the effect of pulpal pressure on tooth color and appearance?
Prevents discoloration
What is the effect of biochemically altered dentin on tooth color and appearance?
Modifies tooth color and appearance
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
What is the purpose of using an incremental filling technique?
To reduce shrinkage stresses during polymerization
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
What is the primary reason for the failure of composite cores?
Loosening of the post and core
What is the typical failure rate of fiber posts and cores after a service period of 7 to 11 years?
Between 7% and 11%
What is the advantage of using light-curing composite core materials?
Eliminates the risk of chemical incompatibility
What is the primary advantage of using resin composites for core fabrication?
Has replaced glass ionomer materials for core fabrication
What is the primary advantage of cast metal post and core?
Has been the traditional method for many years
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
What is the primary advantage of using metal posts compared to amalgam or gold cores?
Provides some protection from root fracture in teeth
What happens when a fiber post/composite foundation fails?
Severe untreatable root fractures occur
What is the primary location of functional stresses in a fiber post/composite foundation?
Cervical area around the post
Why is a ferrule necessary in a fiber post/composite foundation?
To provide additional retention and resistance
What determines the pattern of stress transmission from the post to the root dentin?
The modulus of elasticity of the post and dentin
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
What is the primary purpose of restorations of endodontically treated teeth?
All of the above
What is the outcome of a root fracture originating at the apex of a rigid post?
Severe untreatable root fractures
What is a common requirement for a post, regardless of its material or design?
Retention and resistance
What is the effect of MOD cavities on the fracture resistance of endodontically treated teeth?
It decreases the fracture resistance by 69%
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
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
What is the benefit of using resin composite materials for restorations of endodontically treated teeth?
They reduce the risk of periodontal bone resorption
What is the benefit of using in vitro fiber-reinforced composite restorations for endodontically treated teeth?
They represent a valuable alternative to conventional restorations
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
When is a full crown restoration of choice for an endodontically treated tooth?
When a significant amount of coronal tooth structure has been lost
What is the main reason why resin composite materials may require the use of reinforcing fibers?
To increase their mechanical resistance
What is the primary purpose of a post in a nonvital anterior tooth?
To retain and support the crown
What type of posts are used in nonvital anterior teeth restorations?
Nonmetal esthetic posts
What is the primary advantage of ceramic coronal restorations?
Highly esthetic with lifelike color and vitality
What is the preferred method of cementation in nonvital anterior teeth restorations?
Adhesive cementation
What is the primary purpose of a core in a nonvital anterior tooth?
To restore tooth structure
What is the primary advantage of CAD-CAM restorations?
Increased accuracy
What is the primary purpose of etching in ceramic restorations?
To improve bonding
What is the primary material used in structurally compromised anterior teeth restorations?
Ceramic
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
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.
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