Crown to implant ratio
Crown to implant ratio is not really appropriate since increasing implant length does little to strengthen the implant past about 5mm. However, if doing this then you should measure from most coronal bone contact to most coronal surface of restoration. Therefore if the implant experiences bone loss the crown to implant ratio will get worse.
- NOT a risk factor for biological complications
- If favorable force orientation and load distribution, little prosthetic risk even if 2-3 C/I ratio
- Can be a prosthetic risk for single abutment and crown loosing if C/I 1.5
- Can be a prosthetic risk for 2mm wide abutment fracture if C/I 2
Misch says if crown abutment heights approach 15mm there is an increase in prosthetic issues. DT thread stating