29 Questions
What is the primary function of a matrix in restorative dentistry?
To confine the restoration during setting
Which of the following is an ideal requisite for a matrix in restorative dentistry?
Rigidity
What is the classification of matrices based on transparency?
Transparent and opaque matrices
Which type of matrix is mechanically retained?
Ivory matrix retainer no. 1
What is the main purpose of an anatomic/custom-made matrix in restorative dentistry?
To displace the gingiva and rubber dam
Which matrix serves the purpose of being self-retained?
Automatrix
What was the main reason for the disappointing clinical performance of the initial formulations of composite restorations in the late 1960s?
Large, irregular filler particles with low filler content by weight
Which of the following was NOT a shortcoming of early composite restorations?
High flexural strength
Which mechanical property of composites depends on the fillers used?
Elastic modulus
What is the typical filler content by weight in hybrid composites?
80% - 90%
What type of filler particles are typically found in hybrid composites?
Microlevel particles with glass range of 1 - 3 micrometers
Which of the following is a common issue associated with early composite restorations?
Marginal breakdown
Which factor affects the smoothness and polishability of composite materials?
Filler size and composition
What do nanohybrid and nanofill composites provide in terms of surface textures?
Polishable and esthetically satisfying surfaces
What is the Linear Coefficient of Thermal Expansion (LCTE) a measure of?
Dimensional change of a material per unit change in temperature
What is the main function of the resin matrix in composite materials?
Forms a continuous phase and binds the filler particles
How does bonding a composite to etched tooth structure help reduce negative effects?
By matching the LCTE of the composite and tooth structure
Which of the following is a reinforcing particle used in composite resins according to the text?
Quartz
What effect does water absorption have on a restorative material?
It changes the material's properties and reduces effectiveness
What is the purpose of using Barium, Strontium, Zirconium, and zinc glasses in composite resins?
Radiopacity
How are filler contents related to water absorption in materials?
Higher filler contents lead to lower water absorption
What factor affects the wear resistance of a material?
Size, shape, and content of filler particles
Why do restorations near gingival tissues require surface smoothness?
For optimal gingival health
What does hue in color refer to?
The intrinsic quality or shade of color
What primarily contributes to the chroma of a tooth?
Dentin
What happens to the value as chroma increases?
Value decreases
Which part of the tooth has the thinnest enamel according to the text?
Cervical area
How are canines different from central and lateral incisors in terms of hue?
Canines are more reddish
Why are older teeth generally more reddish according to the text?
Loss of enamel thickness and opacity
Explore the concept of Linear Coefficient of Thermal Expansion (LCTE) in dental materials and its importance in preventing voids or openings at the junction of materials and teeth. Learn how bonding composites to tooth structure can reduce negative effects of temperature changes.
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