Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Al-Otaibi, Hanan Nejer; Alfouzan, Afnan F.; Al-Mufleh, Tamadher S.; Labban, Nawaf

doi:10.1111/cid.12657

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…The results of Jorge et al and Al-Otaib et al [ 38 , 44 ] corroborate those of previous studies, which found that all detorque values were lower than the insertion torque in the baseline in the external hexagon connection and Morse taper (Jorge et al) and the internal connection (Al-Otaibi et al). The loss of torque loss a few minutes after torque application is expected and can be explained by a phenomenon known as the sedimentation effect or embedment relaxation [ 25 , 54 ].…”

Section: Discussionsupporting

confidence: 86%

“…Static mechanical behavior after one tightening was evaluated in two studies: Jorge et al 2013 and Al-Otaibi et al 2018 [ 38 , 44 ]. A torque of 35 Ncm was applied to the abutment screw in the study of Al-Otaibi et al; an insertion torque of 20 or 30 Ncm, recommended by the manufacturer, depending on the abutment, was applied by Jorge et al Retention screws received insertion torque; after 3 min, the initial detorque was measured using a torque gauge by Jorge et al Al-Otaibi et al used three protocols in which abutment screws were subjected to different maintenance of torque application (instant, 10 s, 30 s), and the removal torque value (RTV) was recorded with a digital torque gauge.…”

Section: Resultsmentioning

confidence: 99%

“…Investigation of the effect of different maintenance times of torque application and screw loosening was the aim of the study of Al Otaibi et al [ 44 ] in internal hexagon implants. The mean RTVs were lower than the applied torque for all the protocols.…”

Section: Discussionmentioning

confidence: 99%

“…In the study of Al-Otaibi [ 44 ], removal torque was found to be 79.8% of the applied torque. The results of this study also showed that the retorqued-once application technique resulted in significantly higher RTVs compared to those of the torqued and retorqued-twice techniques.…”

Section: Discussionmentioning

confidence: 99%

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Review of the Mechanical Behavior of Different Implant–Abutment Connections

Vinhas

Aroso

Salazar

et al. 2020

IJERPH

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Introduction: Different implant–abutment connections have been developed to reduce mechanical and biological failure. The most frequent complications are loss of preload, screw loosening, abutment or implant fracture, deformations at the different interfaces, and bacterial microleakage. Aim: To review the evidence indicating whether the implant–abutment connection type is significant regarding the following issues: (1) maintenance of the preload in static and dynamic in vitro studies; (2) assessment of possible deformations at the implant–abutment interfaces, after repeated application of the tightening torque; (3) evaluation of the sealing capability of different implant connections against microleakage. Materials and Methods: In June 2020, an electronic literature search was performed in Medline, EBSCO host, and PubMed databases. The search was focused on the ability of different implant connections to maintain preload, resist deformation after tightening and retightening, and prevent microleakage. The related titles and abstracts available in English were screened, and the articles that fulfilled the inclusion criteria were selected for full-text reading. Results: The literature search conducted for this review initially resulted in 68 articles, among which 19 articles and 1 systematic review fulfilled the criteria for inclusion. The studies were divided according to the three proposed objectives, with some studies falling into more than one category (maintenance of preload, surface abutment–implant deformation, and resistance to microleakage). Conclusions: Conical abutment appears to result in fewer mechanical complications, such as screw loosening or fractures, and higher torque preservation. After SEM evaluation, damage was observed in the threads of the abutment screws, before and after loading in internal and external connections. Internal hexagon implants and predominantly internal conical (Morse taper) implants showed less microleakage in dynamic loading conditions. We suggest further studies to guarantee excellence in methodological quality.

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Section: Discussionsupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Review of the Mechanical Behavior of Different Implant–Abutment Connections

Vinhas

Aroso

Salazar

et al. 2020

IJERPH

View full text Add to dashboard Cite

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“…The abutment material could influence the joint stability [5]. In the present study, torque maintenance was tested using digital torque meter device [22][23][24]. There were no significant differences regarding the mean torque loss values between the three groups.…”

Section: Discussionmentioning

confidence: 80%

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

2020

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Purpose: To evaluate the tightening torque maintenance with zirconia, lithium disilicate, and polyetheretherketone (PEEK) hybrid-abutment-crowns after thermal aging, in addition to assess the fracture resistance of hybridabutment-crowns fabricated with different materials. Materials and methods: Thirty implants were restored with identical hybrid-abutment-crowns, resembling the maxillary first premolar, fabricated from zirconia (Zr), lithium disilicate (L2), or ceramic-reinforced PEEK (PE). The three groups (n = 10) were constructed utilizing a Ti-base. After bonding, each restoration was secured in its respective implant with a torque of 25 Ncm. All restorations were subjected to thermal aging for 7000 cycles. The loosening torque was assessed utilizing the digital torque meter. Each restoration was subjected to fracture testing and the mode of failure was determined. Results: Zr group displayed the highest mean torque loss value (2.70 ± 0.59 Ncm) with the mean loosening torque value of 22.38 ± 0.68 Ncm. PE group displayed the lowest mean torque loss (2.55 ± 0.50 Ncm) with mean loosening torque value of 22.61 ± 0.59 Ncm. There was no significant difference between study groups regarding loosening torque (p = 0.68), torque loss (p = 0.80), and percentage of torque loss (p = 0.79). There was significant difference regarding the mean fracture load value between Zr and PE groups. However, there was no significant difference (p = 0.05) regarding mean fracture load value between L2 and PE groups. Conclusion: The hybrid-abutment-crown material does not affect the torque maintenance after thermal aging. Based on fracture load, zirconia hybrid-abutment-crown can be used, while lithium disilicate and PEEK hybridabutment-crowns may cautiously serve in premolar region.

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