Long-term effect of implant-abutment connection type on marginal bone loss and survival of dental implants

Abstract

Purpose This study aimed to compare the long-term survival rate and peri-implant marginal bone loss between different types of dental implant–abutment connections. Methods Implants with external or internal abutment connections, which were fitted at Gangneung-Wonju National University Dental Hospital from November 2011 to December 2015 and followed up for >5 years, were retrospectively investigated. Cumulative survival rates were evaluated for >5 years, and peri-implant marginal bone loss was evaluated at 1- and 5-year follow-up examinations after functional loading. Results The 8-year cumulative survival rates were 93.3% and 90.7% in the external and internal connection types, respectively ( P =0.353). The mean values of marginal bone loss were 1.23 mm (external) and 0.72 mm (internal) ( P <0.001) after 1 year of loading, and 1.20 mm and 1.00 mm for external and internal abutment connections, respectively ( P= 0.137) after 5 years. Implant length (longer, P =0.018), smoking status (heavy, P =0.001), and prosthetic type (bridge, P =0.004) were associated with significantly greater marginal bone loss, and the use of screw–cement-retained prosthesis was significantly associated ( P =0.027) with less marginal bone loss. Conclusions There was no significant difference in the cumulative survival rate between implants with external and internal abutment connections. After 1 year of loading, marginal bone loss was greater around the implants with an external abutment connection. However, no significant difference between the external and internal connection groups was found after 5 years. Both types of abutment connections are viable treatment options for the reconstruction of partially edentulous ridges.

Radiographic evaluation of marginal bone levels around implants supporting splinted fixed bridges: A retrospective study on 412 implants

“…Data obtained in the present study indicated that cementretained prostheses were significantly more prone to develop higher MBL than screw-retained ones. This corroborates emerging evidence suggesting that the presence of undetected subgingival cement remnants can lead to increased MBL which in turn may trigger the onset of peri-implantitis (Kim et al, 2022;Staubli et al, 2017).…”

Survival rate of dental implants installed by postgraduate students attending an implantology program in Brazil: A 52-month retrospective analysis

“…Concerning the type of implant connection, a recent study (19) showed no significant difference in the cumulative survival rate between implants with external and internal abutment connections. These results seem to corroborate the findings of the present study.…”

Effects of Enamel Matrix Derivative on Cell Spheroids Made of Stem Cells Obtained from the Gingiva on Osteogenic Differentiation

“…Secondly, the study examined only a small subset of enamel matrix derivative concentrations, which may not accurately reflect the full range of effective amounts [ 52 ]. The study tracked cell behavior for up to 14 days only, which may not accurately represent how the enamel matrix derivative will affect the cells over the long run [ 53 ]. It would also be helpful to investigate the effectiveness of enamel matrix derivative at various concentrations and exposure times.…”