Preload loss of abutment screws after dynamic fatigue in single 
implant-supported restorations. A systematic review

Pardal-Peláez, Beatriz; Montero, Javier

doi:10.4317/jced.54374

Cited by 31 publications

(43 citation statements)

References 22 publications

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“…As many in vitro studies have reported, the friction between the abutment screw and the inner of the implant decreases after cyclic loading, and so does the torque. 19,36,37 A higher preload means a stronger resistance of the screw to loosening, and this slows down the process of screw loosening. 38,39 The preload is positively correlated with the value of the screw tightening torque.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…External hexagon connections have been shown to have rotational misfit in the range of 3 to 10°, while a rotational misfit of less than 2°is required to provide a stable screw joint that limits screw loosening (Binion, 1996a). Thus a disadvantage to the external hexagon connection includes a higher prevalence of screw loosening, which ranges from 6% to 48% (Levine et al, 1997;Pardal-Peláez and Montero, 2017), a higher prevalence of rotational misfit, a less esthetic result, and often, an inadequate microbial seal. Design modifications to improve abutment stability and fit and to limit rotational misfit have been applied to the height and width of the external hexagon.…”

Section: Introductionmentioning

confidence: 99%

In vitro assessment of connection strength and stability of internal implant-abutment connections

Kofron

Carstens

Cong

et al. 2019

Clinical Biomechanics

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Background: Various connections have been machined to improve the fit between the dental abutment and implant. In vivo, the instability created by imprecisely fitting components can cause soft tissue irritation and bacterial colonization of the implant system. The aim of this study was to quantify abutment stability under in vitro force applications. Methods: Abutment stability and fit were quantitatively measured after application of rotational, vertical, and horizontal forces. Findings: The abutment connection held by friction (Friction-Fit) was the only group to have 0°angular rotation. A significantly greater vertical force was required to pull the abutment from the implant for the Friction-Fit connection as compared to all other experimental groups. The abutment connection held by a mechanically locking friction-fit with four grooves (CrossFit) and Friction-Fit demonstrated significantly lower lateral movement as compared to all other connections. The remaining connections evaluated included two hexagon connections that rely on screw placement for abutment fit (Conical + Hex #1 and Conical + Hex #2), one connection with protruding slots to align with recessed channels inside the implant (Conical + 6 Indexing Slots), and an internal connection that allows for abutment indexing every 120°(Internal Tri-Channel). Interpretation: Internal connection geometry influenced the degree of abutment movement. Friction-Fit and CrossFit connections exhibited the lowest rotational and horizontal motions. Significant differences were found between Friction-Fit and CrossFit following the application of a vertical force, with the Friction-Fit requiring a significantly greater pull force to separate the abutment from the implant.

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“…In this case, internal connection ( Figure 1b) allowed a better union between the implant and the abutment. Finally, morse taper connection (Figure 1c), which is another option for an internal connection, was introduced because of its improvement on screw loosening [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fatigue Behavior in Dental Implants from In Vitro Clinical Tests: A Systematic Review

Rojo

Prados-Privado

Reinoso

et al. 2018

Metals

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In the area of dentistry, there is a wide variety of designs of dental implant and materials, especially titanium, which aims to avoid failures and increase their clinical durability. The purpose of this review was to evaluate fatigue behavior in different connections and implant materials, as well as their loading conditions and response to failure. In vitro tests under normal and dynamic loading conditions evaluating fatigue at implant and abutment connection were included. A search was conducted in PubMed, Scopus, and Science Direct. Data extraction was performed independently by two reviewers. The quality of selected studies was assessed using the Cochrane Handbook proposed by the tool for clinical trials. Nineteen studies were included. Fourteen studies had an unclear risk and five had high risk of bias. Due to the heterogeneity of the data and the evaluation of the quality of the studies, meta-analysis could not be performed. Evidence from this study suggests that both internal and morse taper connections presented a better behavior to failure. However, it is necessary to unify criteria in the methodological design of in vitro studies, following methodological guidelines and establishing conditions that allow the homogenization of designs in ISO (International Organization for Standardization) standards.

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Preload loss of abutment screws after dynamic fatigue in single implant-supported restorations. A systematic review

Cited by 31 publications

References 22 publications

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

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

In vitro assessment of connection strength and stability of internal implant-abutment connections

Evaluation of Fatigue Behavior in Dental Implants from In Vitro Clinical Tests: A Systematic Review

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