This study compared the surgical protocol efficacy of immediately and delayed loading implant therapy in edentulous maxillae opposed by natural or restored mandibular dentitions, over a 6 years plus period of observation. The selected outcome determinants included individual implant survival data, progressive measurements of peri-implant bone resorption, prosthodontic survival and success data and report of complications. Materials and Methods A convenience sample of 49 patients requiring fixed implant supported maxillary prostheses was split into two groups. The test group (34 patients) was treated according to the Columbus Bridge Protocol that prescribes the insertion of 4-6 implants that include distally tilted ones, and are loaded within 24 hours. The control group (15 patients) was treated via a two stage surgical protocol of 6-9 straight implants that were loaded a mean 8.75 months after stage 1 implant surgery. Two hundred sixty implants (test: n=163, control: n=97) were placed, and all subjects were ultimately treated with screw-retained full-arch prostheses. Results Two patients dropped-out (one in the test group, and one in the control group) by the time of the scheduled sixth annual visit. The other patients were followed-up for 75.2 months (range: 72-90 months). At the 6-year follow-up, no differences in implant cumulative survival rate were found between groups. Significantly (p = 0.001) less bone loss was found in the test group (mean: 1.62 mm) compared to the control group (mean: 2.44 mm). All of the original prostheses were maintained throughout the study’s observation period and were functioning satisfactorily at each patient’s last recall appointment. Conclusion In this study, patients who received immediate and delayed implant loading in their edentulous maxillae demonstrated similar survival outcomes. However less marginal bone loss was recorded around the immediately loaded implants over the study’s 6 year duration period.
Immediate Versus Delayed Loading of Dental Implants in Edentulous Patients' Maxillae: A 6-year Prospective Study
MENINI, MARIA;Pesce P;SIGNORI, ALESSIO;PERA, PAOLO
2014-01-01
Abstract
This study compared the surgical protocol efficacy of immediately and delayed loading implant therapy in edentulous maxillae opposed by natural or restored mandibular dentitions, over a 6 years plus period of observation. The selected outcome determinants included individual implant survival data, progressive measurements of peri-implant bone resorption, prosthodontic survival and success data and report of complications. Materials and Methods A convenience sample of 49 patients requiring fixed implant supported maxillary prostheses was split into two groups. The test group (34 patients) was treated according to the Columbus Bridge Protocol that prescribes the insertion of 4-6 implants that include distally tilted ones, and are loaded within 24 hours. The control group (15 patients) was treated via a two stage surgical protocol of 6-9 straight implants that were loaded a mean 8.75 months after stage 1 implant surgery. Two hundred sixty implants (test: n=163, control: n=97) were placed, and all subjects were ultimately treated with screw-retained full-arch prostheses. Results Two patients dropped-out (one in the test group, and one in the control group) by the time of the scheduled sixth annual visit. The other patients were followed-up for 75.2 months (range: 72-90 months). At the 6-year follow-up, no differences in implant cumulative survival rate were found between groups. Significantly (p = 0.001) less bone loss was found in the test group (mean: 1.62 mm) compared to the control group (mean: 2.44 mm). All of the original prostheses were maintained throughout the study’s observation period and were functioning satisfactorily at each patient’s last recall appointment. Conclusion In this study, patients who received immediate and delayed implant loading in their edentulous maxillae demonstrated similar survival outcomes. However less marginal bone loss was recorded around the immediately loaded implants over the study’s 6 year duration period.
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