Clinical and Radiographic Outcomes of Dental Implant Therapy

A questionnaire was distributed to the 4716 identified subjects. 3827 questionnaires (81.15%) were returned and, hence, included in the analysis. From the sample of 3827 patients who responded to the questionnaire, 3107 (81.19%) gave their consent for access of patient files/records. Patient files/records of 2780 individuals could be collected from the treating dentists (89.48%). Out of the 2780, 900 individuals were selected by random sampling, stratifying only for the two age groups. Inclusion Criteria: * Having received implants within the Swedish insurance system in 2003/2004. * Being in one of the two age groups in 2003: 65-75 years and 45 - 55 years. * Having answered the initial questionnaire * Treating dentist provided patient files/records Exclusion Criteria: \- Having died during the study period (collection of questionnaire and patient files/records)