When placing a screw-retained implant-supported crown, what is the minimum required interocclusal (restorative) space from the implant platform level?

The minimum restorative space for implant prostheses, from platform to opposing dentition: screw-retained at implant level requires 4-5 mm; screw-retained at abutment level requires 7.5 mm; cement-retained requires 7-8 mm; unsplinted overdenture requires 7 mm; bar overdenture requires 11 mm; fixed hybrid (All-on-X) requires 15 mm. If the question asks about a screw-retained crown with an abutment (the typical clinical scenario), the answer is 7.5 mm. If at the implant level directly, it is 4-5 mm. The most commonly tested answer for a standard screw-retained implant crown is 7 mm (for cemented) or 7.5 mm (for screw-retained at abutment level). Based on Wiley's Practical Procedures in Aesthetic Dentistry (which states screw-retained restorations can be made with as little as 4 mm at platform level), the original answer of 7 mm has been updated.