In Vitro Cyclic Dislodging Test on Retentive Force of Two Types of Female Parts of SFI-Bar

Abstract

This study aimed to compare the difference in mechanical behavior between two types of female-part clips of the Stress-Free Implant Bar (SFI-Bar) system during simulation of insertion-removal cycles. Materials and Methods: A total of 10 samples simulating SFI-Bar-attachment-retained implant overdentures were fabricated and randomly divided into two groups (n = 5). One group used E-clips (Elitor alloy) as the female part of the SFI-Bar, and the other used T-clips (all titanium grade IV with red nylon inserts). A total of 14,000 insertionremoval cycles were carried out on each sample. Retentive forces from each cycle were recorded for analysis. Results: Significant differences were found between the two groups (P < .05). Conclusion: The retentive force of E-clips increased as the number of dislodging cycles increased, suggesting that some adjustment may be needed to lower this part's retentive force. T-clips with changeable nylon inserts were deformed after about 4,200 insertion-removal cycles, which interfered with insertion. This indicated that T-clips may need replacement after 2 to 3 years of clinical use.

Stress free versus Hader bars for immediately loaded two-implant retained mandibular overdentures. A one-year randomized trial evaluating marginal bone loss and patient satisfaction

“…Also casting or soldering the Hader bar may reduce the length of the retentively usable bar surfaces 27 , while the entire length of SFI bar may be used to increase the retention. The increased retention of the SFI bar was in line with findings of another study 24 in which the authors used plastic clips over the SFI bar and found that these clips maintain retention and need replacement after 2 to 3 years of clinical use. Also, Kobayashi, et al 26 noted that SFI-Bar exhibit higher retentive capacities than the Locatorattachment over time.…”

“…This bar connects implants with no soldering or laserwelding. This allows construction of a passive-fit bar 24 with reduced corrosion 25 . Moreover, this bar can be used with individual implant angulations up to 15°2 6 .…”

“…The length of the tube bar can be adjustable according to the interimplant distance. The bar is supplied with 2 types of female part, the E-clips (Elitor precious metal alloy) and the T-clips (all titanium grade IV with nylon inserts) 24 . Despite these several advantages, longterm success of this system still has to be proved in randomized clinical studies 26 that compared it to the conventional used bars.…”

Locator versus stress free implant bar attachments for two -implants immediately loaded by mandibular overdentures. A one year randomized study

“…This bar connects implants with no soldering or laserwelding. This allows construction of a passive-fit bar 17 with reduced corrosion 18 . Moreover, this bar can be used with individual implant angulations up to 15°1 9 .…”

“…It can be adjusted to variable interimplant distance. The bar is supplied with 2 types of female part, the E-clips (Elitor precious metal alloy) and the T-clips (all titanium grade IV with nylon inserts) 17 . Despite these several advantages, the success of SFI bar needs to be investigated in clinical studies 19 .…”