Start practicing

Prosthodontics & Occlusion · single question

CASE 6 — Patient's 3-unit bridge fell. Clinical photos show over-prepared teeth. Which of the following is NOT a reason why the bridge failed?

  1. Bridge margins placed on existing restoration
  2. Over-preparation of the axial walls
  3. Long span bridge
  4. Inadequate preparation of the teeth
Show answer and explanation

Correct answer: B. Over-preparation of the axial walls

  • A. Margins on existing restorations compromise marginal seal and integrity → failure cause.
  • B. SOURCE ANSWER: A. The exam intends this as the exception. Over-preparation of axial walls (excessive tapering) reduces retention form and resistance — it IS a failure cause in reality. The source may be testing that 'too much preparation of axial walls' specifically (as opposed to inadequate preparation) is the exception. Discuss with study group.
  • C. Long span bridges flex more and fail at higher rates → failure cause.
  • D. Inadequate preparation → insufficient retention → bridge failure. Clear failure cause.

Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes

More Prosthodontics & Occlusion practice questions