In vitro mechanical analysis of complete-arch mandibular implant-supported fixed prostheses abutment screws after cyclic loading

Sananez, Andreina; Lefebvre, Carol A.; Looney, Stephen W.; Baker, Paul E.; Mettenburg, Don

doi:10.1016/j.prosdent.2014.09.026

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Evidence suggests that a single application of a physiological load on cantilever prosthesis may be the reason for the loss of preload on the prosthetic screw. 20 Moreover, the study indicates that the retention mechanism of implant screws is significantly influenced by functional and parafunctional forces in vivo condition. 21 Thus, the present findings possibly underestimate the torque loss that occurs in clinical situation.…”

Section: Resultsmentioning

confidence: 91%

“…instant torque, 10, 20 and 30 seconds) of torque application on the detorque values in single external hexagon implant system. Evidence suggests that a single application of a physiological load on cantilever prosthesis may be the reason for the loss of preload on the prosthetic screw 20. This was explained by assuming that maintaining torque for prolonged time reduces the loss of preload by permitting elastic deformation.…”

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confidence: 99%

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

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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The application of 35 N-cm for different maintenance time of torque application on implant abutment screw did not appear to affect the detorque value in a multiple implant-supported fixed prosthesis. Maintaining the torque for prolonged time (10 seconds or 30 seconds) was not significantly associated with higher preload than instant torque application in full-arch implant-supported prosthesis.

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Section: Resultsmentioning

confidence: 91%

mentioning

confidence: 99%

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

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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“…Finally, it has not been tested in oral conditions. Many intraoral conditions (functional load, humidity, and temperature) cause the screw to loosen 5960. Therefore, the loosening torque before applying the oral condition in this study should be regarded as a relatively high loosening torque.…”

Section: Discussionmentioning

confidence: 93%

Accuracy of different electronic torque drivers: A comparative evaluation

Lee

Kang

et al. 2019

J Adv Prosthodont

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PURPOSEThis study aims to evaluate the loosening torque on the implant fixture, and to assess the accuracy of difference electronic torque drivers.MATERIALS AND METHODSThree electronic torque drivers were used to measure the loosening torque on the implant system (AnyOne; MegaGen). The implant fixtures were divided among the 3 electronic torque driver types (W&H, SAESHIN, and NSK group) and 9 for each group. The screws were fastened at the implant fixture by three electronic torque drivers using the tightening torques recommended by the manufacturers of the drivers. After 10 minutes, the screws were again fastened at the implant fixture with equal torque. Then, the loosening torques were measured with an MGT12 torque gauge (MARK-10, Inc.). This measurement procedure was repeated 10 times under loosening torques of 15 Ncm, 25 Ncm, and 35 Ncm. In the statistical analysis, all values of loosening torque were analyzed with the one-way ANOVA and Kruskal-Wallis test (α=.05) for comparative evaluation.RESULTSThere were significant inter-group differences at loosening torques of 15 Ncm and 25 Ncm (P<.05). The accuracy of the NSK driver was the highest, followed by SAESHIN and W&H. There was no significant difference between NSK and W&H at 35 Ncm (P>.05). The SAESHIN driver showed the closest loosening torque at 35 Ncm.CONCLUSIONThe most accurate loosening torques were SAESHIN at 35 Ncm, and NSK at 15 Ncm and 25 Ncm. Since the loosening torque may vary depending on the tightening torques and electronic torque drivers, periodic calibration of the electronic torque driver is recommended.

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“…This result corroborates results by Ding results. [4][5][6][7][8][9][10][11][12][13][14] Regarding torque loss, two-way variance analysis showed no significant effect of the interaction between connection implant type and site of force application. 2018) disagree on the effect of the interaction between connection implant type and/or site of force application.…”

Section: Discussionmentioning

confidence: 99%

Screw removal torque evaluation in implants with cone morse and external hexagon platforms in anterior cantilever

Figueiredo

Francischone

Franco

et al. 2021

IAJMH

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This study aims to evaluate the screw removal torque on prosthetic platforms of Cone Morse (CM) and External Hexagon (EH) implants in crowns with anterior cantilever. Materials and Methods: in vitro study with a sample consisting of 20 test specimens of 2 elements (21 and 22), with n = 40; load is simulated on element 21 or on cantilever of 22. Samples were divided into 4 groups consisting of 10 test specimens on CM implants (groups 1 and 2), and 10 test specimens on EH implants (groups 3 and 4). The test specimens were manufactured using cylindrical PVC pipes measuring 22 x 19.05 mm filled with acrylic resin. The implants were fixed with a centralization device. Components used were EUCLAs and UCLAs with a chrome-cobalt alloy molten base. The metal bases were scanned, the crowns were digitally waxed, made on CAD/CAM system, and cemented on the metal bases with Panavia cement. Torque was applied using 20N for CM and 32N for EH, according to the manufacturers’ instructions. The test specimens were then subjected to a cycling process consisting of 1,000,000 cycles at a frequency of 2 Hz. The cyclic process applied axial forces to the surface (palate face of 21 and 22). Two cycling processes were carried on, the first on the palate face of 21 and the second on the palate face of 22. Between the two, screws were removed and replaced by new ones. The screw removal torque was measured using a digital torque meter. Results were analyzed with Student’s t test and variance analysis. Statistical calculations were conducted in SPSS 23 using 5% of significance. Results: Student’s t test showed significantly lower removal torque values in comparison with initial torque for both CM and EH connection implants and force applied to elements 21 and 22 (p < 0.001) or 22 (p < 0.001). Considering torque loss, there was no significant effect of the interaction between type of implant connection and site of force application (p = 0.094). Removal torque was significantly lower than initial torque for both implants (CM and EH). Conclusion: Torque loss occurred both in CM and EH. There was no significant effect of the interaction between connections and site of force application.

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In vitro mechanical analysis of complete-arch mandibular implant-supported fixed prostheses abutment screws after cyclic loading

Cited by 7 publications

References 30 publications

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

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

Accuracy of different electronic torque drivers: A comparative evaluation

Screw removal torque evaluation in implants with cone morse and external hexagon platforms in anterior cantilever

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