All-Ceramic Finish Line — ORE Part 1 MCQ
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Reveal the answer and explanation
Correct answer: B — Shoulder or deep chamfer
Explanation lettering: E = shown as A · A = shown as B · D = shown as C · C = shown as D · B = shown as E
The correct answer is A: Shoulder or deep chamfer. Current evidence strongly supports deep/heavy chamfer as the optimal finish line design for all-ceramic crowns, offering superior internal adaptation and lower stress concentration compared to shoulder preparations alone. Both are clinically acceptable with defined reduction dimensions (≥1.0 mm for chamfer; ≥1.0 mm for shoulder). Knife-edge margins (B) are contraindicated—they are difficult to mill, produce poor marginal fit, and concentrate stress. Feathered/no finish line designs (D) are restricted to paediatric stainless-steel or prefabricated crowns, not custom all-ceramic restorations. 'Chamfer only' (E) is imprecisely worded and undershoots recommended depth. 'Bevelled shoulder' (C) is non-standard terminology in modern prosthodontic guidelines.
Reference: Impact of finish line designs on the adaptation of ceramic fixed dental prostheses: a systematic review and network meta-analysis (2025, BMC Oral Health); Optimization of Lithium Disilicate Glass-Ceramic Crowns: Finish Line, Scanning, and Processing Methods (2023, Int J Prosthodont); Comparative Effect of No Finish Line, Heavy Chamfer, and Shoulder Marginal Designs on the Fracture Resistance of Zirconia (Cercon) Ceramic Restoration (2023, Cureus). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12231902/