Complication incidence of two implant systems up to six years: a comparison between internal and external connection implants
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Purpose: This study was conducted to compare the cumulative survival rates (CSRs) andthe incidence of postloading complications (PLCs) between a bone-level internal connectionsystem (ICS-BL) and an external connection system (ECS). Methods: The medical records of patients treated with either a ICS-BL or ECS between2007 and 2010 at Asan Medical Center were reviewed. PLCs were divided into two categories:biological and technical. Biological complications included >4 mm of probing pocketdepth, thread exposure in radiographs, and soft tissue complications, whereas technicalcomplications included chipping of the veneering material, fracture of the implant, fractureof the crown, loosening or fracture of the abutment or screw, loss of retention, andloss of access hole filling material. CSRs were determined by a life-table analysis and comparedusing the log-rank chi-square test. The incidence of PLC was compared with thePearson chi-squared test. Results: A total of 2,651 implants in 1,074 patients (1,167 ICS-BLs in 551 patients and1,484 ECSs in 523 patients) were analyzed. The average observation periods were 3.4 yearsfor the ICS-BLs and 3.1 years for the ECSs. The six-year CSR of all implants was 96.1%(94.9% for the ICS-BLs and 97.1% for the ECSs, P=0.619). Soft tissue complications weremore frequent with the ECSs (P=0.005) and loosening or fracture of the abutment orscrew occurred more frequently with the ICS-BLs (P<0.001). Conclusions: Within the limitations of this study, the ICS-BL was more prone to technicalcomplications while the ECS was more vulnerable to biological complications.
Abstract
Purpose: This study was conducted to compare the cumulative survival rates (CSRs) andthe incidence of postloading complications (PLCs) between a bone-level internal connectionsystem (ICS-BL) and an external connection system (ECS). Methods: The medical records of patients treated with either a ICS-BL or ECS between2007 and 2010 at Asan Medical Center were reviewed. PLCs were divided into two categories:biological and technical. Biological complications included >4 mm of probing pocketdepth, thread exposure in radiographs, and soft tissue complications, whereas technicalcomplications included chipping of the veneering material, fracture of the implant, fractureof the crown, loosening or fracture of the abutment or screw, loss of retention, andloss of access hole filling material. CSRs were determined by a life-table analysis and comparedusing the log-rank chi-square test. The incidence of PLC was compared with thePearson chi-squared test. Results: A total of 2,651 implants in 1,074 patients (1,167 ICS-BLs in 551 patients and1,484 ECSs in 523 patients) were analyzed. The average observation periods were 3.4 yearsfor the ICS-BLs and 3.1 years for the ECSs. The six-year CSR of all implants was 96.1%(94.9% for the ICS-BLs and 97.1% for the ECSs, P=0.619). Soft tissue complications weremore frequent with the ECSs (P=0.005) and loosening or fracture of the abutment orscrew occurred more frequently with the ICS-BLs (P<0.001). Conclusions: Within the limitations of this study, the ICS-BL was more prone to technicalcomplications while the ECS was more vulnerable to biological complications.
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