The enlarged acceptance of diabetes mellitus has become a global health problem. Hyperglycaemia entails a rise in the morbidity and mortality in diabetic patients. Although a direct relationship with periodontal disease has already been shown, little is known about the results of dental implants in diabetics. This paper reviews various literatures about the effect of diabetes on the osseointegration of implants and the healing of soft tissue. In experimental models of diabetes, a reduced level of bone-implant contact has been shown, and this can be reversed by means of treatment with insulin. Compared with the general population, a higher failure rate is seen in diabetic patients. Most of these occur during the first year of functional loading, seemingly pointing to the microvascular complications of this condition as a possible causal factor. These convolutions also compromise the healing of soft tissues. It is necessary to take certain marked considerations into account for the deployment of implants in diabetic patient. A good control of plasma glycaemia, together with other measures, has been shown to improve the percentages of implant success in these patients. Key words: Diabetes Mellitus, hyperglycaemia, osseointegration, Dental implants.