Volume : 1
Issue : 3
Online ISSN : 2457-0087
Print ISSN :
Article First Page : 85
Article End Page : 91
Objectives: This study retrospectively evaluated the survival rates of immediately loaded implants supporting single crowns, and investigated causes of failures.
Methods: A total of 90 dental implants (Brånemark System® and Replace® Select) supporting single crowns, were placed in 88 patients (35 male, 53 female, mean age: 51.9 years) in a private dental implant clinic. The implants were loaded by provisional crowns within 24 hours after surgery, and the definitive metal-ceramic crown was cemented after 3 months. A comprehensive list of factors that could influence the survival rate of implants, with all possible complications, was compiled. With this list, patient charts were retrospectively screened for possible events related to failure. The median observation time was 25.5 months. Implant survival data were evaluated using the Kaplan-Meier test, in addition to frequency counts and the Fisher Exact Test.
Results: Of the 90 dental implants, 86 (95.6%) implants were still in situ. Three implants (3.3%) were lost after 1, 12 and 19 months respectively, and one implant (1.1%) lost its occlusal screw 5 months after insertion. These implants were inserted in bone of quality type II or III with a torque of more than 32Ncm to get primary stability. One lost implant was inserted with a torque less than 32Ncm and did not have primary stability. The three implants that were lost were placed in the maxilla. The implant with the lost occlusal screw was inserted in the mandible. Three of the four failed implants were Brånemark System® implants, the other one was a Replace® Select implant. Due to the low failure rate, the causes of these failures are speculative, but parafunction seemed to be a risk factor. The mean survival time of the immediately loaded single-tooth implants was 18.8 months.
Conclusion: This retrospective study on the success rate of immediately loaded single-tooth implants yielded a 95.6% success rate. Due to the small number of failures, no definitive conclusion can be drawn concerning the factors leading to failures of implants supporting solitary crowns. This study, nevertheless, illustrates that immediate loading of single-tooth implants is successful, and that it is a reliable treatment option to replace missing natural teeth in order to restore aestethics and/or function.
Keywords: Single tooth implants, Immediately loaded single-tooth implants, Success rate, Failure and survival.