Amalgam, composite, glass ionomer, cements, impression materials, gypsum products, and mixing and setting properties.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What three main metals (besides mercury) make up traditional dental amalgam alloy?
Show answer
Silver, tin, and copper (combined with mercury).- Mixing amalgam alloy with mercury in a mechanical amalgamator is called ____.
Show answer
trituration- Why are high-copper amalgams preferred over low-copper (traditional) amalgams?
Show answer
They resist corrosion and marginal breakdown better and are stronger.- The weakest, most corrosion-prone phase in low-copper amalgam, formed from tin and mercury, is the ____ phase.
Show answer
gamma-2- How does amalgam stay retained in a tooth preparation?
Show answer
Purely mechanical retention from undercuts; it does not chemically adhere to tooth structure.- What causes delayed expansion in a zinc-containing amalgam restoration?
Show answer
Moisture contamination during mixing or placement, which produces hydrogen gas.- Why is amalgam condensed into the cavity preparation in increments?
Show answer
To eliminate voids and excess mercury, increasing the restoration's strength.- What resin typically forms the matrix of dental composite restorative material?
Show answer
BIS-GMA (or a similar dimethacrylate resin such as UDMA).- What is the main purpose of filler particles in composite resin?
Show answer
They increase strength and wear resistance and reduce polymerization shrinkage.- Why are microfilled composites favored for anterior, esthetic restorations?
Show answer
Their very small filler particles allow a smoother, higher-gloss polish.- What type of light activates most light-cured composites, and at roughly what wavelength?
Show answer
Visible blue light, about 450 to 470 nanometers.- What clinical problem results from composite's polymerization shrinkage?
Show answer
Marginal gaps and microleakage, which can cause postoperative sensitivity and recurrent decay.- What is the purpose of acid-etching enamel before bonding composite?
Show answer
It roughens the surface to create micromechanical retention for the bonding resin.- What does a dentin bonding agent do?
Show answer
It forms a hybrid layer that bonds composite resin to dentin.- What are the two components of glass ionomer cement?
Show answer
A fluoroaluminosilicate glass powder and a polyacrylic acid liquid.
FlashKeepers