Study arcade
Interproximal morphology lab · Game 04
Contact Area
Read the neighbor, place the contact, and keep the arch relationship intact.
Best score—Best streak—Accuracy—
Game mode
Course-verified records only in Challenge
Arch positionmaxillary
Contact surface
Viewing axis
Course target shown in green. Junction contacts occupy the narrow boundary band between adjoining thirds.
Course verified · 2 locators
- Mesial neighbor
- #9
- Distal neighbor
- #7
- Mesial height
- Incisal third
- Distal height
- Incisal-middle junction
- Mesial F-L
- Middle third
- Distal F-L
- Middle third
Why this placement
On a maxillary central incisor, the mesial contact is in the incisal third and the distal contact is slightly more cervical at the incisal-middle junction. The central-to-lateral contact is centered faciolingually.
Common trap
Do not put both contacts at the same height just because the crown looks broad and nearly balanced.