Researchers from the Wrocław Medical University in Poland have conducted a study to evaluate whether crown-to-implant (C/I) ratio influences secondary implant stability and marginal bone level in implants with single non-splinted crowns.
The study compared short and regular length implants. Short implants have a lower C/I ratio and are considered as an alternative to maxillary sinus elevation and bone augmentation procedures in cases with reduced alveolar ridge height.
Thirty patients received a single-tooth implant placed in maxillary alveolar bone. Half of the patients received regular length implants and the other received short implants. The regular implant placement was preceded by a sinus lift procedure from a lateral window approach with a xenogeneic bone graft, performed six weeks before the placement.
Cone beam computed tomography (CBCT) and radionuclide ventriculogram (RVG) scans were taken before and 36-months following placement, to assess marginal bone loss and implant stability. These scans were then compared with mean C/I ratios.
The results showed no significant correlations between C/I and implant stability or marginal bone level. Primary and secondary stability results were good for both short and regular implants. Marginal bone level loss was also low for both sets of implants. The authors conclude that the clinical performance of short implants is comparable to that of regular implants.
This study was presented as an e-poster at the 2018 EAO Congress.