Impact of Intentional Overload on Joint Stability of Internal Implant‐Abutment Connection System with Different Diameter

Lee, Jihye; Lee, Won; Huh, Yoon‐Hyuk; Park, Chan‐Jin; Cho, Lee‐Ra

doi:10.1111/jopr.12661

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…Most of the studies related to axial displacement [1][2][3] are on the magnitude of tightening torque and the duration of cyclic loading, and few studies have applied with static loading. Ko et al [4] reported that axial displacement and reverse torque loss occurred at significantly low levels after the cyclic and static loading in the case of wide-type implants of 5.0 mm diameter.…”

Section: Discussionmentioning

confidence: 99%

“…Attempts have been made to understand the factors that could compromise the settling effect of different implant abutment connections [1,2]. Various implant elements including the implant-abutment interface, the types of abutments, the screw characteristics, and the cyclic loading condition have all been shown to influence settling into implants and a loss of preload [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Axial Displacements and Removal Torque Changes of Five Different Implant-Abutment Connections under Static Vertical Loading

Kim

Lim

2020

Materials

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The aim of this study was to examine the settling of abutments into implants and the removal torque value under static loading. Five different implant-abutment connections were selected (Ext: external butt joint + two-piece abutment; Int-H2: internal hexagon + two-piece abutment; Int-H1: internal hexagon + one-piece abutment; Int-O2: internal octagon + two-piece abutment; Int-O1: internal octagon + one-piece abutment). Ten implant-abutment assemblies were loaded vertically downward with a 700 N load cell at a displacement rate of 1 mm/min in a universal testing machine. The settling of the abutment was obtained from the change in the total length of the entire implant-abutment unit before and after loading using an electronic digital micrometer. The post-loading removal torque value was compared to the initial torque value with a digital torque gauge. The settling values and removal torque values after 700 N static loading were in the following order, respectively: Ext < Int-H1, Int-H2 < Int-O2 < Int-O1 and Int-O2 < Int-H2 < Ext < Int-H1, Int-O1 (α = 0.05). After 700 N vertical static loading, the removal torque values were statistically different from the initial values, and the post-loading values increased in the Int-O1 group and Int-H1 group (α = 0.05) and decreased in the Ext group, Int-H2 group, and Int-O2 group (α = 0.05). On the basis of the results of this study, it should be taken into consideration that a loss of the preload due to the settling effect can lead to screw loosening during a clinical procedure in the molar region where masticatory force is relatively greater.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Axial Displacements and Removal Torque Changes of Five Different Implant-Abutment Connections under Static Vertical Loading

Kim

Lim

2020

Materials

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“…The most important reason to investigate the stress distribution in abutments and microstrain in crestal bone around implants is the possibility to provide sufficient information for implant planning, optimizing the implant installation in areas with different bone characteristics ( 11 ). In spite of this, masticatory overload is one of the primary factors for fractures and dental implant loss ( 12 ).…”

Section: Introductionmentioning

confidence: 99%

Influence of different restorative materials on the stress distribution in dental implants

Datte¹,

Tribst²,

Piva³

et al. 2018

J Clin Exp Dent

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BackgroundTo assist clinicians in deciding the most suitable restorative materials to be used in the crowns and abutment in implant rehabilitation.Material and MethodsFor finite element analysis (FEA), a regular morse taper implant was created using a computer aided design software. The implant was inserted at the bone model with 3 mm of exposed threads. An anatomic prosthesis representing a first maxillary molar was modeled and cemented on the solid abutment. Considering the crown material (zirconia, chromium-cobalt, lithium disilicate and hybrid ceramic) and abutment (Titanium and zirconia), the geometries were multiplied, totaling eight groups. In order to perform the static analysis, the contacts were considered bonded and each material was assigned as isotropic. An axial load (200 N) was applied on the crown and fixation occurred on the base of the bone. Results using Von-Mises criteria and micro strain values were obtained. A sample identical to the CAD model was made for the Strain Gauge (SG) analysis; four SGs were bonded around the implant to obtain micro strain results in bone tissue.ResultsFEA results were 3.83% lower than SG. According to the crown material, it is possible to note that the increase of elastic modulus reduces the stress concentration in all system without difference for bone.ConclusionsCrown materials with high elastic modulus are able to decrease the stress values in the abutments while concentrates the stress in its structure. Zirconia abutments tend to concentrate more stress throughout the prosthetic system and may be more susceptible to mechanical problems than titanium. Key words:Finite element analysis, dental implants, ceramic.

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“…Studies carried out with finite element (FE) models have shown that more than 86% of the tightening torque and over 98% of the relaxation torque are balanced by the conical joint of these systems [42]. Generally, most studies dealing with axial displacement do this during cyclic loads [30,43] and few studies have dealt with static loading. Ko et al [44] reported that axial displacement and removal force dramatically decrease as a result of cyclic loading.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Pull-Out Test of a New Hybrid Fixture-Abutment Connection: An In Vitro Study

et al. 2021

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Implant abutment connection was described among the main causes of peri-implant bone resorption. The aim of this in vitro study was to test the coupling capacity, the surface modification of a new hybrid connection and the influence of repeated connection activations caused during the main clinical and laboratory phases. A total of 40 implant-abutment screw retained systems with 10°-conical and internal hexagon connection were tested. The connection was screwed, fixed to the universal test machine, removed the screw and a pull-out test was performed. Test was repeated five times in succession. Also Scanning Electron Microscopy (SEM) was used to detect microscopically surface modification. Analysis of variance and Tukey tests were used for the statistical analysis. Pull-out test reveals a mean value of 131.35 ± 16.52 Newton Centimeter (N·cm). For each single activation, results from first to fifth were: 113.9 ± 13.02, 126.1 ± 12.81, 138.11 ± 15.15, 138.8 ± 11.90 and 140 ± 12.99 N·cm. A statistically significant difference between the measurements and an increase in the removal force was shown. The collected data supports the use of this new type of connection, resulting in a very strong interface between implant and abutment. Also, repeated activation of connection can promote a better coupling of the implant-abutment interface.

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Impact of Intentional Overload on Joint Stability of Internal Implant‐Abutment Connection System with Different Diameter

Abstract: Implants with Ø 5.0 diameter demonstrated significantly low axial displacement and reverse torque loss after the cyclic and static loading of overload condition.

Cited by 12 publications

References 33 publications

Axial Displacements and Removal Torque Changes of Five Different Implant-Abutment Connections under Static Vertical Loading

Axial Displacements and Removal Torque Changes of Five Different Implant-Abutment Connections under Static Vertical Loading

Influence of different restorative materials on the stress distribution in dental implants

Mechanical Pull-Out Test of a New Hybrid Fixture-Abutment Connection: An In Vitro Study

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