Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

Sakamoto, Kei; Homma, Shinya; Takanashi, Takuya; Takemoto, Shinji; Yoshinari, Masao; Yajima, Yasutomo

doi:10.4012/dmj.2016-055

Cited by 16 publications

(19 citation statements)

References 18 publications

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“…Hence, Gr NS(I) could pass the cyclic test in the current study, but Gr NS(NI) could not. The surface analysis of the abutments through SEM indicated burnishing on the octagonal corners, revealing that the index could provide resistance to the torsional moment, similar to the findings of Katsuta and Watanabe (), Sakamoto et al (), and Yao et al (, ). Therefore, the index design is crucial for achieving stable connections because it provides antitorsion (Khraisat, Hashimoto, Nomura, & Miyakawa, ; Yao et al, ).…”

Section: Discussionsupporting

confidence: 83%

Abutment screw withdrawal after conical abutment settlement: A pilot study

Yao

Chang

Fang

et al. 2019

Clinical Oral Implants Res

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Objective This study investigated the effects of abutment screw withdrawal after conical abutment settlement on the stability of the implant–abutment connection. Materials and methods Twenty implants of a conical connection system were used. Two two‐piece abutment designs were used: cone only (n = 10; NI) and cone plus octagonal index design (n = 10; I); for each design, five samples were used with (S) and without (NS) abutment screw withdrawal before a cyclic test. Finally, four groups, namely Gr S(NI), Gr S(I), Gr NS(NI), and Gr NS(I), were included. The cyclic test included cyclic loading of 20–200 N, 30°, and 4‐mm off‐axis to implant axis at 10 Hz for 106 cycles, simulating a clinical time interval of 40 months. The fatigue cycles were recorded. The axial displacement of the conical abutments during abutment settlement, screw withdrawal, and cyclic loading were measured. Abutment morphology was examined through scanning electron microscopy (SEM). Results Only Gr NS(NI) failed the test, indicating that without the index design and abutment screw withdrawal, and connection stability seriously deteriorated. Gr NS(I) exhibited significantly higher axial displacement into the implant after abutment settlement than did Gr NS(NI). It also exhibited continuous axial displacement into the implant after cyclic loading. SEM after cyclic testing in Gr NS(I) revealed marked burnishing on lateral edges of the index, indicating that the index design provides an antitorsional ability. Conclusion Although this study has few limitations, abutment screw withdrawal is feasible in this conical implant–abutment connection system with index design.

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Section: Discussionsupporting

confidence: 83%

Abutment screw withdrawal after conical abutment settlement: A pilot study

Yao

Chang

Fang

et al. 2019

Clinical Oral Implants Res

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“…There are several studies supporting the superior mechanical stability of the internal connection compared to external More specifically, in certain studies it was found that screw loosening was more often in external connection implants compared to internal connection . The problem is often encountered in external hexagon implants during the first 2 years from the placement of the prosthetic restoration, while specific reference is made regarding the screw loosening in single external hexagon implants than in similar implants with internal connection .…”

Section: Discussionmentioning

confidence: 99%

“…The external hexagon has been in use for decades and has been incorporated in several competing systems. It shows certain disadvantages because of its small height There are several studies supporting the superior mechanical stability of the internal connection compared to external [27][28][29][30] More specifically, in certain studies it was found that screw loosening was more tion. 3,7,24,31,32 The problem is often encountered in external hexagon implants during the first 2 years from the placement of the prosthetic restoration, 22 while specific reference is made regarding the screw loosening in single external hexagon implants than in similar implants with internal connection.…”

Section: Internal or External Connection Of Implant-abutmentmentioning

confidence: 99%

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Kourtis

Damanaki

Kaitatzidou

et al. 2017

J Esthet Restor Dent

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The problem of technical complications in implants and implant-supported restorations has existed for decades. The most frequent complication is the loosening of the fixing screw which, although is not catastrophic, if it occurs repeatedly, it may affect the success of the implant therapy and the patient satisfaction. Factors that affect the frequency of prosthetic complications include: the implant-abutment connection, para-functional habits, cantilevers and the type of restoration. The treatment options for the clinician are limited but certain preventing measures during construction of the restoration may be helpful to overcome this clinical problem.

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“…The internal connection is reported to have advantages over external connection in the stability of the implant-abutment connection and has better resistance of torque loss and screw loosening. [54][55][56][57][58][59] According to a recent systematic review of Vetromilla et al, 60 abutment screw loosening and abutment fracture occurred more often in external hexagon connection comparing to internal hexagon or Morse taper connections in clinical studies. There are also studies stating that the difference in connection types does not have a significant influence on screw loosening.…”

Section: Types Of Implant-abutment Connectionmentioning

confidence: 99%

Mechanism of and factors associated with the loosening of the implant abutment screw: A review

Huang

Wang

2019

J Esthet Restor Dent

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Objective While the loosening of the abutment screw is one of the most common complications in implant‐supported restorations, there is a lack of comprehensive literatures for mechanism of and factors associated with the loosening of the implant abutment screw. The review was to summarize the mechanism of and factors associated with the loosening of the implant abutment screw. Overview A total of 99 relevant articles were included in the literature review. The mechanism of the abutment screw loosening was explained. The factors contributed to abutment screw loosening were divided into five aspects and then expounded respectively. Conclusions The internal connection and abutments with anti‐rotational and conical designs have better resistance to screw loosening. Cantilevers increase the risk of screw loosening. The effect of surface treatment of the abutment screw is unsure. Clinicians need to tighten the abutment screw to the recommended torque while avoiding repeated tightening and loosening, and increase the frequency of follow‐ups to retighten the loosened screws in time. Clinical Significance While the loosening of the abutment screw is one of the most common complications in implant‐supported restorations, there is a lack of comprehensive literatures for mechanism of and factors associated with the loosening of the implant abutment screw. The review was to summarize the mechanism of and factors associated with the loosening of the implant abutment screw, so that clinicians may make better choices in clinical practice.

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Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

Cited by 16 publications

References 18 publications

Abutment screw withdrawal after conical abutment settlement: A pilot study

Abutment screw withdrawal after conical abutment settlement: A pilot study

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Mechanism of and factors associated with the loosening of the implant abutment screw: A review

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