Comparison between Crown-to-Root Ratio and Crown-to-Implant Ratio in Natural Teeth.

BACKGROUND

In locations with poor bone quality and significant masticatory pressures, bone resorption after tooth loss inhibits implant implantation. This condition requires augmentation or short implants.

MATERIALS AND METHODS

Fifty low-bone-height patients had single-tooth implants and were observed for 12 months. Radiographs examined crown height, crown-to-implant ratio, and marginal bone loss at baseline, six months, and 12 months. The correlation between crown height and marginal bone loss was examined.

RESULTS

The average crown-to-implant ratio was 1.8:1 in the study. Implant crown heights above 10 mm showed increased marginal bone loss. The mean marginal bone loss at six months was 0.25 ± 0.08 mm, rising to 0.38 ± 0.10 mm at 12 months. Implants with crown heights ≤10 mm had considerably reduced bone loss ( < 0.05) compared to implants with greater crown heights. Optimized crown height distributed lateral stresses for improved clinical results and implant stability.

CONCLUSION

Implant-supported prostheses depend on crown height for lateral force distribution and marginal bone preservation. Implants ≤10 mm crown height showed decreased marginal bone loss and improved treatment results.