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Dental Materials and Operative Dentistry MCQs

BDS Professional Review: Core Dental Sciences · BDS / Dentistry · 26 practice questions

1. While placing a deep Class I composite restoration, a dentist places the material in a single bulk increment of 6 mm and cures it. This technique increases the risk of which complication compared to placing the material in 2 mm increments?

  1. AReduced fluoride release
  2. BFormation of the gamma-2 phase
  3. CIncreased polymerization shrinkage stress
  4. DLoss of silane coupling
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C. Increased polymerization shrinkage stress Composite is placed in increments of about 2 mm specifically to reduce polymerization shrinkage stress, which is more pronounced in bulk-cured large volumes.

2. A dentist needs to take a final impression for a fixed partial denture requiring the highest possible dimensional stability over several days before the model is poured. Which impression material is most appropriate?

  1. AIrreversible hydrocolloid
  2. BAddition silicone (polyvinyl siloxane)
  3. CAlginate
  4. DPolyether
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B. Addition silicone (polyvinyl siloxane) Addition silicone (polyvinyl siloxane) has the best dimensional stability among the impression materials listed, making it ideal for delayed pouring.

3. A worn lesion is noted at the cusp tip of a mandibular first molar with no involvement of the pits, fissures, or proximal surfaces. This best fits which Black classification?

  1. AClass II
  2. BClass I
  3. CClass V
  4. DClass VI
Show answer

D. Class VI Class VI lesions involve cusp tips or incisal edges, distinct from Class I (pits/fissures) or Class II (proximal posterior surfaces).

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