Implants · single question
When placing a screw-retained implant, how much minimum occlusal space is needed from the implant surface to the antagonist?
Show answer and explanation
Correct answer: A. 5 mm
- A. For a SCREW-RETAINED implant crown, a minimum of 5 mm of occlusal space is needed from the implant platform to the opposing teeth. This accommodates: the abutment height (~2-3mm) + screw access channel + ceramic/material thickness. For CEMENT-RETAINED crowns, 7mm is typically needed. ⚠️ Note: some sources cite 7mm — verify with your study materials.
- B. 7 mm is the minimum often cited for CEMENT-RETAINED crowns over abutments, not screw-retained.
- C. 9 mm is greater than the minimum required.
- D. 8 mm is more than the minimum required for screw-retained implants. 5-7 mm is the accepted range.