Clinically available preload prediction based on a mechanical analysis

Jeong, Chang-Gon; Kim, Seong-Kyun; Kim, Jong‐Woong; Yeo, In‐Sung

doi:10.1007/s00419-017-1307-0

Cited by 6 publications

(21 citation statements)

References 5 publications

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“…Screw dynamics play an important role in this interaction because the mechanism linking this connection is fundamentally dependent on the preload of the screw [16]. The preload acts as a clamping force on the implant-abutment complex, and provides stability to the connection [17].…”

Section: External Hex Connection: Butt-jointed Interfacementioning

confidence: 99%

“…Previous biomechanical analyses indicate that the manufacturer's recommended torque of 30-35 Ncm is not sufficient to prevent screw loosening [17,18]. Repeated tightening of the abutment screw is considered essential because of the preload loss in screw mechanics, which is the cause of screw loosening [17]. It is also helpful to use other methods in addition to screw tightening to maintain the stability of the implant-abutment connection.…”

Section: External Hex Connection: Butt-jointed Interfacementioning

confidence: 99%

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Biological Responses to the Transitional Area of Dental Implants: Material- and Structure-Dependent Responses of Peri-Implant Tissue to Abutments

et al. 2019

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The stability of peri-implant tissue is essential for the long-term success of dental implants. Although various types of implant connections are used, little is known about the effects of the physical mechanisms of dental implants on the stability of peri-implant tissue. This review summarizes the relevant literature to establish guidelines regarding the effects of connection type between abutments and implants in soft and hard tissues. Soft tissue seals can affect soft tissue around implants. In external connections, micromobility between the abutment and the hex component of the implant, resulting from machining tolerance, can destroy the soft tissue seal, potentially leading to microbial invasion. Internal friction connection implants induce strain on the surrounding bone via implant wall expansion that translates into masticatory force. This strain is advantageous because it increases the amount and quality of peri-implant bone. The comparison of internal and external connections, the two most commonly used connection types, reveals that internal friction has a positive influence on both soft and hard tissues.

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Section: External Hex Connection: Butt-jointed Interfacementioning

confidence: 99%

Section: External Hex Connection: Butt-jointed Interfacementioning

confidence: 99%

Biological Responses to the Transitional Area of Dental Implants: Material- and Structure-Dependent Responses of Peri-Implant Tissue to Abutments

et al. 2019

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“…The study by Kim et al [28] supports these findings and confirms that it should be taken into account that the loss of preload, due to the sedimentation effect, can lead to loosening of the screws. Although several authors have recommended retightening the screws after a predetermined interval, to overcome the problem of preload loss [5,26,[29][30][31][32][33], others suggest that repeated tightening has little or no effect, and it can even flatten more the contact surfaces, and cause a significant loss of preload [27,[34][35][36][37][38]. In our study, for the 4 implants included with insertion torque of 30 Ncm (Essential and KL) and 25 Ncm (SK2 and Vega) there is significant variation in the mean torque values after 10 tightenings, in the sense that it increases significantly over time.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Study of Preload Loss in Different Implant Abutment Connection Designs

et al. 2022

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The stability and integrity of the abutment-implant connection, by means of a screw, is fallible from the moment the prosthetic elements are joined and is dependent on the applied preload, wear of the components and function. One of the main causes of screw loosening is the loss of preload. The loosening of the screw-abutment can cause complications such as screw fracture, marginal gap, peri-implantitis, bacterial microleakage, loosening of the crown and discomfort of the patient. It is also reported that loosening of the screw/abutment may lead to a failure of osseointegration. It is necessary to evaluate and quantify, with in vitro studies, the torque loss before and after loading in the different connections. Aim: evaluate the influence of implant- abutment connection design in torque maintenance after single tightening, multiple tightening and multiple tightening followed by mechanical cycling. Materials and Methods: 180 Klockner implants divided in 4 groups: 15 SK2 external connection, 25 Ncm tightening torque; 15 KL external connection, 30 Ncm tightening torque; 15 Vega internal connection, 25 Ncm tightening torque; 15 Essential internal connection, 30 Ncm tightening torque. In each group removal torque values (RTV) were evaluated with a digital torque meter, in 3 distinct phases: after one single tightening, 10 multiple tightenings and 10 multiple tightenings and cyclic loading (500 N × 1000 cycles). Results: After one single tightening, and for all connections, RTV were lower than those of insertion, but only for Essential and Vega internal connections this result was statistically significant. After multiple tightening, RTV were significantly lower in all connections. After repeated tightening followed by cyclic loading, mean RTV were significantly lower, when compared to insertion torque. The multiple tightening technique resulted in higher RTV than the single tightening technique, except for Vega implant. The multiple tightening followed by cyclic load, compared to the other phases, was the one that generated the lowest RTV, for all connections. Conclusions: The connection design, in our study, did not seem to influence the maintenance of preload. Loading influenced the loss of preload, in the sense that significantly decreased the removal torque values. The multiple re-tightening technique resulted in higher removal torque values than the single tightening technique. Clinically, our results recommend to retighten retaining screws, a few minutes after insertion.

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“…Abutment mobility is mainly caused by loosening of the abutment screw that stabilizes the implant–abutment assembly. 163 Loosening is more frequent in external than internal type implants, due to elongation and unscrewing of the abutment screw following lateral occlusal force. 164,165 Due to friction between the inclined planes of an implant and abutment, lateral occlusal force is concentrated in this type of internal connection, not on the abutment screw but on the implant wall through the abutment–implant connection area.…”

Section: The Gingiva–abutment Interface (Soft Tissue Seal)mentioning

confidence: 99%