9/5/2023 0 Comments Morse form taps![]() ![]() They can be customized or prefabricated by the manufacturer and made of various materials, such as titanium, gold, aluminum oxide, or zirconium oxide. Ībutments serve as a link, connecting the oral implant and the prosthetic superstructure, and they are usually screw-retained to the implant. These differences between internal and external connections did not reach statistical significance ( p = 0.431). However, a recent systematic review reported a technical complication rate of 10.1% for internal implant–abutment connections and 12.4% for external implant–abutment connections. There are data that suggest that external implant–abutment connections are combined with higher rates of technical complications compared with internal connections. They represent the central stress resistance points of oral implants, as they must counteract the maximal and permanent masticatory forces. Moreover, implant–abutment connections are considered a key factor of a successful implant therapy since they directly influence the long-term stability of the systems. The success of an implant treatment depends on the successful osseo- and soft tissue integration of the implant and also on the stability of the restoration (i.e., the implant–abutment–crown complex). Nevertheless, the screwless Morse taper IACs were stable for an extended service time and might represent a valid form of treatment for single-tooth replacement. The screw preload/retention in the conical IAC was lost over time in the group where the screws were kept in place during loading. The screw-retained hexagonal IAC showed the highest retention stability. Regarding the pull-off test, the screw-retained internal hexagonal IAC revealed significantly higher resistance to failure/disassembling (769.6 N) than screwless conical IACs (171.6 N–246 N) ( p 0.05). All the samples revealed a 100% survival. The survived samples were exposed to a pull-off force until failure/disassembling of the connection. All specimens were subjected to a cyclic loading (98 N) for 10 million chewing cycles. Thirty-two implant abutments restored with an upper central incisor zirconia crown were used and divided into four groups according to the implant–abutment assembling manner (C1,H: screw retained (20 Ncm) C2: tapped or C3: torqued (20 Ncm the screws were removed before the dynamic loading)). The aim of this study is to evaluate the effect of artificial chewing on the long-term stability of screwless Morse taper IACs. ![]() The use of screwless Morse taper implant–abutment connections (IAC) might facilitate the clinician’s work by eliminating the mechanical complications associated with the retention screw. ![]()
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