Open margins on delivery (not detected/accepted)
What it is
Delivering (and often cementing) a crown/bridge with a marginal gap — a detectable space between the restoration margin and the prepared tooth finish line — because it was not properly checked or was noticed but accepted. Marginal discrepancy leaves a thicker cement interface exposed to the oral environment.
Why it happens
• Incomplete seating at try-in due to internal binding (tight internal spots), proximal contact too tight, or premature occlusal contact • Impression/scan or model errors (distortion, margin capture problems) leading to a restoration that cannot fully adapt • Cementation-related seating error (viscosity, timing, incomplete seating pressure control) — the crown may "float" coronally • Inadequate detection protocol (no explorer/tactile check, no radiograph when indicated, rushed appointment)
The full clinical mistake entry includes
- How to avoid it — the prevention protocol
- The clinical tip experienced clinicians use
- The documented reference behind the mistake
More clinical mistakes
Dentalverse is an educational resource for dental students and dentists. This page is a study reference — it is not medical advice and does not replace clinical judgment. Always follow your institution's protocols and your supervisor's guidance.