30 Questions
Which material contains a mixture of metals such as silver, copper, and tin, in addition to approximately 50 percent mercury?
Dental amalgam
Despite not being tooth colored, which material has been used for restoring teeth for over 150 years?
Dental amalgam
Which trial could find no difference in neuropsychological or renal complications between the use of dental amalgam and compomer/composite when restoring posterior primary or permanent molars?
New England Children’s Amalgam Trial (NECAT)
What is the success rate of Class I amalgam restorations in primary teeth for up to seven years?
85 to 96 percent
Which material is widely used despite having repeated concerns about its safety?
Dental amalgam
Which material is specifically mentioned as having a mixture of silver, copper, and tin?
Dental amalgam
Which material has been used for over 150 years despite not being tooth colored?
Dental amalgam
Which type of dental material has been modified with glass particles of different sizes, significantly affecting its physical and mechanical properties?
Glass ionomer cements
What technique can improve the properties of dental materials by applying a Nano-protective coating?
Micro-laminated technique
Which category of restorative materials releases ions such as calcium, fluoride, or phosphate, and is used for regeneration, repair, and reconstruction in conservative dentistry?
Bioactive materials
What are smart materials able to respond to in a controlled way?
Stress, temperature, moisture, pH, and electric or magnetic fields
Which type of material has the ability to return to its original state after an external force has been removed?
Smart materials
Which material is not commonly associated with the field of conservative dentistry for regeneration, repair, and reconstruction?
Burs
Which type of dental material has been reinforced with metal?
Conventional glass ionomer cements
Which dental material is based on GIC technology and has been modified with glass particles of different sizes?
Hybrid materials
Which type of material is not a smart material in pediatric dentistry?
Burs
Which type of adhesive is considered the gold standard for durability and bond strength in dental procedures?
Simplified etch-and-rinse adhesives
What is the setting mechanism of glass ionomer cements?
Acid-base reaction
What is the main reason composites may not be ideal for primary teeth?
Technique sensitivity
What compromises the durability of the resin-dentin bond in dental restorations?
Intrinsic enzymes like matrix metalloproteinases (MMPs)
What is the purpose of Chlorhexidine (CHX) application in dental procedures?
To inhibit MMP activity
What do bulk fill composites contain for increased radiopacity and deeper polymerization?
Specific particles
What is the classification of conventional glass ionomer cements based on their applications?
Luting, restorative, and base/liner and fissure sealant
Which restorative material has the ability to release fluoride and can be recharged with topical fluorine gels?
Resin modified glass ionomer cements
What is a disadvantage of conventional glass ionomer cements?
Low wear resistance
What is a characteristic of polyacid modified resin-based composites (compomers)?
They release fluoride ions effectively
What is a feature of compomers' adhesion?
Adhesion occurs by micromechanical means
Which restorative material is recommended for the restoration of all types of cavities in children and adults, including stress-bearing occlusal surfaces?
Dyract AP
What is a disadvantage of resin modified glass ionomer cements?
Short working time
What is a limitation of conventional glass ionomer cements?
Low resistance to chewing pressures
Study Notes
Advantages and Disadvantages of Glass Ionomer Cements and Compomers
- Restorative glass ionomer cements have advantages such as easy placement, direct adhesion to teeth and metals, quick setting time, and thermal compatibility with tooth enamel and dentin.
- However, they also have disadvantages including low wear resistance, short working time, long setting time, and susceptibility to breakage and moisture contamination during setting.
- Conventional glass ionomer cements have very low bond strength to dental tissues, low resistance to chewing pressures, poor color stability, and require additional appointments for polishing.
- Resin modified glass ionomer cements were developed to address the limitations of conventional glass ionomer cements, with improved wear and fracture resistance, increased bond strength, and controlled setting time.
- They also have the ability to release fluoride, can be recharged with topical fluorine gels, and form a moisture-resistant resin matrix layer on the surface, reducing the need for isolation and the waiting time for polishing.
- Polyacid modified resin-based composites (compomers) were introduced in the mid-1990s, with the ability to release fluoride, attractive esthetic value, and simple handling properties, making them useful in pediatric dentistry.
- Compomers are composed of 70% composite and 30% glass ionomer, and all curing reactions are carried out by light polymerization, with adhesion occurring only by micromechanical means.
- However, compomers do not release fluoride ions as effectively as conventional and resin modified glass ionomer cements and cannot be recharged with topical fluoride ions.
- Dyract AP, a specific compomer, is recommended for the restoration of all types of cavities in children and adults, including stress-bearing occlusal surfaces, where the cavity is less than two-thirds the intercuspal distance.
- The presentation and clinical placement of compomer material in a cervical cavity in an upper left central incisor tooth are illustrated, showcasing its application in pediatric dentistry.
- The resin modified glass ionomer cements set hardness in light but retain the acid-base setting reaction due to the high glass ionomer content, continuing for several days due to water absorption.
- Compomers are suitable for various cavity restorations, including stress-bearing occlusal surfaces, and their clinical placement is demonstrated in a cervical cavity in an upper left central incisor tooth.
Test your knowledge of restorative dental materials with this quiz on the advantages and disadvantages of glass ionomer cements and compomers. Explore their properties, applications, and clinical considerations in pediatric dentistry.
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