Preload Evaluation of Different Screws in External Hexagon Joint

Assunção, Wirley Gonçalves; Délben, Juliana Aparecida; Tabata, Lucas Fernando; Barão, Valentim Adelino Ricardo; Gomes, Érica Alves; Garcia, Idelmo Rangel

doi:10.1097/id.0b013e31823fcbce

Cited by 35 publications

(46 citation statements)

References 19 publications

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“…This result is in agreement with a previous study 8 . The lower maintained torque found for the coated screws could be due to the reduced friction during tightening, which could also reduce the screw's friction resistance during loosening.…”

Section: Discussionsupporting

confidence: 83%

“…The current study showed the maintained torque was lower than the tightening torque for the screws in all groups, which is in agreement with previous studies 3,5,[6][7][8] . This likely occurs due to the phenomenon known as "settling" or "embedment relaxation" 3 .…”

Section: Discussionsupporting

confidence: 82%

“…The lower maintained torque found for the coated screws could be due to the reduced friction during tightening, which could also reduce the screw's friction resistance during loosening. Coated screws may decrease torque loss after mechanical cyclic loading due to friction reduction during tightening, helping the screw turn farther for a given torque and increasing the contact between the threads of the screw joint, resulting in less screw vibration and fewer micromovements during mechanical cyclic loading [7][8][9] ; however, this effect was not evaluated in the current study. Tightening techniques can decrease the loosening of the abutment retaining screws, but there is no consensus in the literature concerning the benefits of coated retaining screws for abutment fixation [7][8][9][10][11] , so clinical studies are needed to confirm the results found in the current study and clarify the hypotheses reported.…”

Section: Discussionmentioning

confidence: 69%

“…In addition, holding the torque meter for a longer time period during the tightening torque application on the retaining screw could also decrease the settling effect. Moreover, manufacturers of abutment retaining screws have used dry lubricants, such as diamond-like carbon (DLC), to reduce friction during tightening and to allow more screw-turning for a given torque 7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Tightening techniques for the retaining screws of universal abutment

Regalin

Alessandretti

Federizzi

et al. 2016

Rev. odontol. UNESP

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ResumoObjetivo: Este estudo avaliou a manutenção do torque de parafusos de retenção do pilar universal utilizando diferentes técnicas de aperto e parafusos com ou sem revestimento. Material e método: Os parafusos foram apertados nos implantes da seguinte forma: Controle -32 Ncm de torque; H20 -segurando os 32 Ncm de torque por 20 s; R -32 Ncm de torque, repetido após 10 min (retorque); e H20+R -combinando as duas técnicas de aperto. Foram também avaliados parafusos de titânio com e sem revestimento da rosca. Resultado: A análise estatística mostrou maior manutenção do torque de parafusos de titânio (p<0,001). A técnica H20+R apresentou a maior manutenção do torque (p=0,003), semelhante a manutenção do torque da técnica H20. Conclusão: Parafusos de titânio combinando as duas técnicas de aperto pode melhorar a manutenção do torque.Descritores: Prótese dentária fixada por implante; conexão implante dentário; torque. AbstractPurpose: This study evaluated the torque maintenance of universal abutment retaining screws using different tightening techniques, and coated or uncoated screws. Material and method: The screws were tightened to implants as following: Control -32 Ncm torque; H20 -holding 32 Ncm torque for 20 s; R -32 Ncm torque, repeated after 10 min (retorque); and H20+R -combining the two tightening techniques. Titanium and coated screws were also evaluated. Result: Statistical analysis showed higher maintained torque for titanium screws (p<0.001). The H20+R technique showed the highest maintained torque (p=0.003), but the H20 technique's maintained torque was similar. Conclusion: Titanium screws associating the two tightening techniques can improve maintained torque.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tightening techniques for the retaining screws of universal abutment

Regalin

Alessandretti

Federizzi

et al. 2016

Rev. odontol. UNESP

Self Cite

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“…Wear decreases the retention force of attachments, causing discomfort to the patient and increasing the maintenance needs of removable prosthetic restorations [49]. The last application of TiN coating in implant dentistry is the covering of retentions screws for implant supported crowns [50]. Screws coated with aluminum titanium nitride showed inferior retention of torque, a finding that might be associated with the minimal ductility of the coated screw compared to pure Ti.…”

Section: Coatings In Implant Dentistrymentioning

confidence: 99%

Titanium Nitride and Nitrogen Ion Implanted Coated Dental Materials

et al. 2012

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Titanium nitride and/or nitrogen ion implanted coated dental materials have been investigated since the mid-1980s and considered in various applications in dentistry such as implants, abutments, orthodontic wires, endodontic files, periodontal/oral hygiene instruments, and casting alloys for fixed restorations. Multiple methodologies have been employed to create the coatings, but detailed structural analysis of the coatings is generally lacking in the dental literature. Depending on application, the purpose of the coating is to provide increased surface hardness, abrasion/wear resistance, esthetics, and corrosion resistance, lower friction, as well as greater beneficial interaction with adjacent biological and material substrates. While many studies have reported on the achievement of these properties, a consensus is not always clear. Additionally, few studies have been conducted to assess the efficacy of the coatings in a clinical setting. Overall, titanium nitride and/or nitrogen ion implanted coated dental materials potentially offer advantages over uncoated counterparts, but more investigation is needed to document the structure of the coatings and their clinical effectiveness. OPEN ACCESSCoatings 2012, 2 161

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Wear of Morse taper and external hexagon implant joints after abutment removal

Prado

Pereira

Silva

et al. 2017

J Mater Sci: Mater Med

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The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva. The abutments were firstly torqued to the implants according to the manufacturer´s recommendations, using a handheld torque meter. Groups B and D were immersed into 24 well-plates containing 2 ml BHI medium with microorganisms for 72 h at 37 °C under microaerophilic conditions. After detorque evaluation, the abutments were removed and the implants were analyzed by scanning electron microscopy (SEM) and profilometry. On the detorque evaluation, the torque values decreased for the external hexagon implants and increased for the Morse taper implants. However, the values were lower when both implant-abutment assemblies were in contact with a medium containing biofilm from human saliva. The wear areas of contacting surfaces of the implants were identified by SEM. The highest average roughness values were recorded on the surfaces free of biofilm. The medium containing biofilm from human saliva affected the maintenance of the torque values on Morse taper and external hexagon abutments. Additionally, the removal of abutment altered the inner implant surfaces resulting in an increase of wear of the titanium-based connection.

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Preload Evaluation of Different Screws in External Hexagon Joint

Abstract: All screw types exhibited reduction in the detorque value. The titanium screw maintained the highest percentage of torque whereas the gold-coated screw and the titanium screw with aluminum titanium nitride coating retained the lowest percentage.

Cited by 35 publications

References 19 publications

Tightening techniques for the retaining screws of universal abutment

Tightening techniques for the retaining screws of universal abutment

Titanium Nitride and Nitrogen Ion Implanted Coated Dental Materials

Wear of Morse taper and external hexagon implant joints after abutment removal

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