Restorative Dentistry Flashcards

Which type of glass ionomer cement is most appropriate as a lining under a composite restoration?

Answer: Conventional glass ionomer (resin-modified)

Resin-modified glass ionomer is ideal as a lining due to its fluoride release, adhesion to dentine, and compatibility with composite bonding systems.

What is the purpose of a wedge when placing a Class II restoration?

Answer: Separate the teeth and adapt the matrix band

A wedge separates teeth slightly to compensate for matrix thickness, adapts the band cervically, and protects the adjacent tooth during preparation.

According to current UK guidelines, when should a direct pulp cap be considered?

Answer: Mechanical exposure in a symptom-free tooth with healthy pulp

Direct pulp cap is indicated for mechanical or traumatic exposures in teeth with no signs of irreversible pulpitis, offering a chance of pulp preservation.

Which base material provides the greatest thermal insulation under a metallic restoration?

Answer: Zinc oxide eugenol cement

Zinc oxide eugenol has sedative properties and low thermal conductivity, making it an effective base for thermal insulation under metal restorations.

What is the recommended occlusal reduction for a full-coverage porcelain-fused-to-metal (PFM) crown on a posterior tooth?

Answer: 1.5–2.0 mm

A minimum of 1.5–2.0 mm occlusal reduction is required for PFM crowns to allow adequate metal and porcelain thickness without compromising strength.

Which finishing bur is most appropriate for contouring composite resin in the interproximal area?

Answer: Flame-shaped fine diamond or finishing strip

Flame-shaped fine diamonds or abrasive finishing strips are used interproximally to contour and polish composite without damaging adjacent teeth.