Clinical Comparison of Screw-Retained and Screwless Morse Taper Implant-Abutment Connections: One-year Postloading Results

Geckili, Esma; Geçkili, Onur; Bilhan, Hakan; Kutay, Ömer; Bilgin, Tayfun

doi:10.11607/jomi.5314

Cited by 6 publications

(9 citation statements)

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“…A screw is tightened by applying torque as a clamping force to provide a stable joint between the abutment and implant fixture. This clamping force is also known as the preload, which elongates the screw within the material then elastically recovered, increasing the strength with which the abutment and implant are pulled together [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of different angulations and collar lengths of conical hybrid implant abutment on screw loosening after dynamic cyclic loading

2018

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BackgroundThe purpose of this in vitro study was to evaluate the effect of different angulations and collar lengths of the implant abutment on screw loosening by measuring removal torque value (RTV) before and after dynamic cyclic loading using digital torque gauge.MethodsA total 90 sets of 4.5 mm diameter × 10 mm length bone level implants with conical hybrid connection were used. They were divided equally according to abutment angulation, into three groups: GI 0° abutment, GII 15° abutment, and GIII 25°. Each group was divided into two subgroups, 15 each, according to collar height: subgroup A (2 mm) and subgroup B (4 mm). Each implant and abutment assembly was positioned vertically in the center of the acrylic resin block using stainless steel cylindrical split mold. Initial analysis was made by abutment screw tightened with 30 Ncm torque twice with 10-min intervals using a digital torque gauge. RTV before and after cyclic loading of the abutment screws were measured in newton centimeter using digital torque gauge. One hundred thousand cycles of eccentric dynamic cyclic loading, at 130 N at a rate of 1 Hz, were applied 5 mm away from the central axis of the implant fixture. Percentage of removal torque loss (%RTL) before and after dynamic cyclic loading were calculated and statistically analyzed using the SPSS version 20.ResultsFor GI, %initial RTL was 25.0 ± 1.5% and decreased significantly after loading (23.5 ± 2.3%). For GII, %initial RTL was 25.5 ± 1.4% and increased significantly after loading (33.4 ± 3.7%). For GIII, %initial RTL was 25.944 ± 1.2% and increased significantly after loading (40.1 ± 5.1%). There was significant effect on screw loosening for abutment angulations and collar lengths.ConclusionWithin the limitations of this study, results suggested that screw loosening increases with increasing abutment angulations and collar lengths after dynamic cyclic loading.

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Section: Introductionmentioning

confidence: 99%

Effect of different angulations and collar lengths of conical hybrid implant abutment on screw loosening after dynamic cyclic loading

2018

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“…The studies of the literature research showed that the Morse taper abutments could be compared very well with the screwed abutments and that the designs differ only slightly regarding clinical failure. 8 9 20 None of the studies showed a greater loosening or even a loss of the abutment. During the last decades, in literature two different assumptions have appeared: the first possible explanation is that the abutment tends to be cold welded to the implant due to the high pressure, which in turn leads to the abutment being firmly anchored in the implant.…”

Section: Discussionmentioning

confidence: 94%

“…In the studies by Mangano et al as well as by Geckili et al the inserted implant construction was loaded with forces from all different directions and with various, compressive forces. 8 18 19 Axial loading might favor the system.…”

Section: Discussionmentioning

confidence: 99%

“…Some manufacturers provide solutions where the abutment-crown complex is connected to the implant without screw to a locking taper. 8 This technique does not use cement to retain the crown or screws to retain the abutment. On the one hand, the clinical outcome of this screwless and cementless system for single implant restorations is favorable, compared with the results for the screw- and cement-retained single implant restorations.…”

Section: Introductionmentioning

confidence: 99%

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Pull-off resistance of a screwless implant-abutment connection and surface evaluation after cyclic loading

et al. 2021

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PURPOSE The aim of this study was to investigate to what extent cyclic load affects the screwless implant-abutment connection for Morse taper dental implants. MATERIALS AND METHODS 16 implants (SICvantage max) and 16 abutments (Swiss Cross) were used. The screwless implant-abutment connection was subjected to 10,000 cycles of axial loading with a maximum force of 120 N. For the pull-off testing, before and after the same cyclic loading, the required force for disconnecting the remaining 6 implant-abutment connections was measured. The surface of 10 abutments was examined using a scanning electron microscope 120× before and after loading. RESULTS The pull-off test showed a significant decrease in the vertical force required to pull the abutment from the implant with mean 229.39 N ± 18.23 before loading, and 204.30 N ± 13.51 after loading ( P <.01). Apart from the appearance of polished surface areas and slight signs of wear, no visible damages were found on the abutments. CONCLUSION The deformation on the polished abutment surface might represent the result of micro movements within the implant-abutment connection during loading. Although there was a decrease of the pull-off force values after cyclic loading, this might not have a notable effect on the clinical performance.

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“…23,24 This connection enhances the mechanical stability of the abutment, such as high resistance to bending forces at the implant-abutment interface, and prevents rotation and abutment loosening. 25,26 Therefore, the new prosthetic system is assumed to show sufficient mechanical strength for restoration with an implant-supported posterior crown. A decrease in retention has been reported during the initial 1 000 000 cycles.…”

Section: Discussionmentioning

confidence: 99%

Implant-supported fixed dental prosthesis with a microlocking implant prosthetic system: A clinical report

Choi

Lee

Bae

et al. 2020

The Journal of Prosthetic Dentistry

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A microlocking implant prosthetic system has recently been developed to address the limitations of conventional screw-and cement-retained implant-supported fixed dental prostheses. This prosthesis system consists of a precision-machined abutment and an attachment that includes zirconia balls and a nickel-titanium spring, thus providing retrievability and constant retention of the prosthesis. In addition, screw-related complications are avoided because there is no retention screw. The occlusal access hole is of a smaller diameter than that of conventional screw-retained prostheses, which is beneficial for esthetics and occlusion. It also prevents common complications of cement-retained prostheses because residual cement around the prosthesis can be removed extraorally. This article presents a clinical treatment with this new prosthetic system.

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Clinical Comparison of Screw-Retained and Screwless Morse Taper Implant-Abutment Connections: One-year Postloading Results

Cited by 6 publications

References 0 publications

Effect of different angulations and collar lengths of conical hybrid implant abutment on screw loosening after dynamic cyclic loading

Effect of different angulations and collar lengths of conical hybrid implant abutment on screw loosening after dynamic cyclic loading

Pull-off resistance of a screwless implant-abutment connection and surface evaluation after cyclic loading

Implant-supported fixed dental prosthesis with a microlocking implant prosthetic system: A clinical report

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