Prosthodontics & Occlusion · single question
Where in a veneer preparation is failure or under-preparation MOST likely to occur?
Show answer and explanation
Correct answer: B. Incisal third
The incisal third is the most common site of under-preparation in veneer preps. Adequate reduction (1.0–1.5 mm) at the incisal edge is critical for esthetic veneer thickness, but dentists tend to under-reduce here due to fear of pulpal exposure or shortening the tooth. Inadequate incisal reduction results in a veneer that appears too thick or opaque, causing premature failure at the incisal margin.
- A. ❌ The middle third is typically well-prepared as it is the most visible and accessible area.
- B. ✅ CORRECT – The incisal third is most commonly under-prepared in veneer preparations, leading to aesthetically or structurally inadequate veneers.
- C. ❌ Proximal boxes are not part of standard veneer preparation design.
- D. ❌ The gingival third is commonly over-prepared (subgingival margins placed unnecessarily); under-preparation is less common here.
Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes