The bleeding on probing is more often in the poorly controlled population, but the probing depth is not increased.

Diabetes and implant survival

Implant survival is an easily defined and measured endpoint for dental implant therapy. Nearly every study reports its implant survival rate. Our literature search identified 18 publications with these data. We divided them into two groups: the first one covers 7 studies with observation time up to 1 year (6 prospective, 1 retrospective studies), the second one longer periods (4 prospective, 1 cross-sectional, and 6 retrospective studies). In the short-time group, 5 of the studies had a healthy control group. The result for implant survival in diabetics is 100 to 96.4 %, which does not differ from the healthy control. The 2 studies without control group report a 100 % survival rate 4 months and 1 year after implantation. The time periods in the long-time group differ from 1 year up to 20 years and are very heterogeneous. We found 4 prospective, 6 retrospective, and 1 cross-sectional study. Seven studies compared the diabetic survival rates to healthy population, and results are equivocal. On the one hand, survival rates of diabetics are similar to healthy control: 95.1 vs. 97 %, 97.2 vs. 95 %, 92 vs. 93.2 %, and 97 vs. 98.8 %. On the other hand, there are 2 studies reporting relative risk for implant failure in diabetic patients elevated to 4.8 and 2.75, respectively. The studies without a healthy control present survival rates from 100 to 86 %, 97.3 and 94.4 % after 1 and 5 years, and 91 to 88 % after 5 years, which are comparable to survival rates in healthy individuals. There is one work that demonstrates survival rate of 85.6 % after 6 years, which is lower than that in healthy population. The most implant failures were observed in the first year after prosthetic loading.