Less root needed for successful implants

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A new study in the current issue of the Journal of Oral Implantology has found that the crown-to-root ratio is not as important to the success of implants as previously thought.

In the study, radiographs were used to examine 309 single-tooth short-length implant-supported restorations in 194 patients. All the implants had been surgically placed between February 1997 and December 2005.

The ideal crown-to-root ratio for a tooth to serve as an abutment for a partial denture is considered one to two-twice as much root as crown. But previous studies have given mixed results about ratios for implanted teeth. Excessive crown-to-implant ratios have been named as detrimental to long-term survival of an implant, while disproportionate ratios have been noted in high rates of implant survival.

The current study found an average crown-to-implant ratio of 2 to 1. Natural teeth with such ratios would often be recommended for extraction and replacement. The authors found that stable implants could be produced with less of the tooth serving as root.

Additionally, the study found no statistically significant relationship between increasing crown-to-implant ratios and decreasing bone-to-implant contact levels around the implant.

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