Survival rates of short implants investigated
lundi 5 août 2019
Posted by: Paola Pino
The standard implant length is 8mm. However, it is often the case in clinical practice that conditions are not suitable for implants of this length to be used. In cases involving bone height deficiencies, shorter implants are often required.
||A research team from Miguel Hernandez University (Elche) in Spain set out to evaluate the survival rates of 4x6mm implants in fresh extraction sockets in both the maxilla and mandible. The study also aimed to evaluate the prevalence of peri-implantitis and establish possible causes of lost implants.
The study involved 261 patients who had undergone implant surgery (161 women; 100 men). The patient cohort had received a total of 535 implants with a mean time from load of 4.01 +/- 2.11 years. The team analysed 167 single implants with a follow-up of over five years. The survival rate was 97.6% (98.8% in the mandible and 95% in the maxilla).
The main cause of implant failure was found to be the presence of peri-implantitis (PI), which accounted for 69.2% of failures. PI prevalence was 7.7% at the implant level and 14.2% at the patient level. The results showed that survival rates were significantly lower in patients who were smokers than the non-smoking group.
The study found that for implants placed in sites where horizontal regeneration had been performed (total of 46 implants), the survival rate was 100%. Similarly, a total of 43 implants were placed in sites which had received vertical regeneration (simultaneous or delayed), the survival rate was 97.7%.
The study found that the survival rate of short implants is comparable with that of standard-length implants in the short and medium term. The main cause of implant loss is peri-implantitis. The authors note that the placement of immediate implants post-extraction is a risk factor for survival. However, they recommend further RCT studies to corroborate these findings and studies with a longer follow-up period to determine the long-term behaviour of short implants.
This study was presented as an e-poster at the 2018 EAO Congress.