Crown to implant ratio

Crown to implant ratio

Crown to implant ratio does not seem to be really appropriate since increasing implant length does little to strengthen the implant past about 5mm. However, if want to measure your C/I ratio 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.

C/I ratio systemic reviews and other research

Quaranto 2014 Systemic Review

  • 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
  • No biomechanical risk
  • No impact on survival
  • No impact on marginal bone loss

When does the crown to implant ratio matter?

Misch says if crown abutment heights approach 15mm there is an increase in prosthetic issues. DT thread stating

 

To learn about splinted dental implants check our blog on splinted vs non-splinted dental implants.

 

 

 

 

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