Restorative Dentistry Flashcards

What is the most common cause of secondary caries around existing restorations?

Answer: Microleakage at the restoration margin

Microleakage allows oral fluids and bacteria to penetrate the restoration margin, leading to demineralisation and secondary (recurrent) caries.

When assessing a tooth for a crown, which finding is an absolute contraindication?

Answer: Non-restorable caries extending below the alveolar crest

If caries or tooth destruction extends below the alveolar crest with insufficient ferrule, the tooth cannot be adequately restored with a crown.

In the BEWE (Basic Erosive Wear Examination), a score of 3 indicates:

Answer: Hard tissue loss of more than 50% of the surface area

A BEWE score of 3 denotes severe erosive wear with hard tissue loss exceeding 50% of the surface, requiring urgent management.

Which bonding agent generation is currently recommended for optimal dentine bonding in UK restorative practice?

Answer: Seventh or eighth generation (universal adhesives)

Universal (7th/8th generation) adhesives offer versatility, effective bonding to enamel and dentine, and can be used in etch-and-rinse or self-etch modes.

What is the primary reason for bevelling enamel margins in anterior composite restorations?

Answer: Increase bonding surface area and improve aesthetics

Bevelling exposes enamel prisms end-on, increasing the bonding area and allowing a gradual colour transition for improved aesthetic blending.

When should a patient be referred for tooth whitening on the NHS in the UK?

Answer: NHS whitening is not available; it is a cosmetic procedure

Tooth whitening is classified as a cosmetic procedure and is not available on the NHS; patients must access it privately through a registered dental professional.