Which structure?
The finishing edge of the artificial crown.
← All explanationsCrown margin
Why does the junction between tooth and crown matter?
The crown margin is the outer finishing edge of an artificial crown. On a natural tooth it meets the prepared tooth tissue. Fit, surface quality and access for cleaning matter. A dark line alone proves neither decay nor a leaking crown.
For training & practice ↓
AI-generated
Choose a view
Locate the junction
In a section model the crown ends at the prepared tooth. Depending on the situation, the margin can be above, level with or below the gum line.
Assess more than colour
Assessment includes marginal fit, deposits, gums and tooth tissue. Staining, a gap and decay are different findings.
Demonstrate cleaning
A crowned tooth still needs cleaning at the junction and between teeth. Choose tools that reach the area without injuring tissue.
At a glance
Is colour enough?
No.
Daily priorities?
Cleaning and suitable reviews.
Knowledge in motion
Explained in 36 seconds.
Three steps. No audio.
Each scene can also be selected manually.
Silent educational film with German on-screen text and simplified teaching images. Not a patient case or a promised treatment outcome. The full English explanation is available below.
Read the film text in English
Locate the junction
In a section model the crown ends at the prepared tooth. Depending on the situation, the margin can be above, level with or below the gum line.
Assess more than colour
Assessment includes marginal fit, deposits, gums and tooth tissue. Staining, a gap and decay are different findings.
Demonstrate cleaning
A crowned tooth still needs cleaning at the junction and between teeth. Choose tools that reach the area without injuring tissue.
Often confused
Crown margin and preparation finish line
The crown margin belongs to the finished restoration. The preparation finish line is formed on the tooth. They should correspond but are not the same structure.
Quick answers
Must a visible margin be replaced?
Visibility alone is not a reason. Material, gum position, symptoms and clinical findings guide the decision.
Can decay occur around a crowned tooth?
Yes, the remaining natural tissue can develop decay. A crown does not replace cleaning or reviews.
What if it bleeds or feels rough?
Have it examined and ask for cleaning instruction. Do not probe for a gap with sharp objects yourself.
At the practice
For a personal discussion
Editorially suggested question to discuss with Dr Niusha Barahmand Pour:
How are fit, gum health and tooth tissue assessed at this margin?
An unusual margin can be assessed alongside advice on cleaning.
Arrange a crown-margin assessmentAppointment selection at DoctolibLearning layer for training & practiceUnderstand terminology and deepen knowledge
- Marginal adaptation
- Fit at the junction between restoration and tooth.
- Preparation finish line
- The boundary formed during tooth preparation.
- Supragingival
- Located above the gum margin.
Make the distinction
The crown margin belongs to the finished restoration. The preparation finish line is formed on the tooth. They should correspond but are not the same structure.
Sources and context
Editorial research: . General information, not an individual diagnosis or treatment recommendation. Teaching illustrations are simplified and do not depict a patient case.