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Open AccessArticle

Comparative Analysis of the Stability of Prosthetic Screws under Cyclic Loading in Implant Prosthodontics: An In Vitro Study

1
Department of Prosthodontics, University of Ferrara, Via Luigi Borsari, 46-44121 Ferrara, Italy
2
Interdisciplinary Department of Medicine, University of Bari, Piazza Giulio Cesare, 11-70124 Bari, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2021, 11(2), 622; https://doi.org/10.3390/app11020622
Received: 9 December 2020 / Revised: 21 December 2020 / Accepted: 7 January 2021 / Published: 11 January 2021
Background: To compare the loss of preload in absence of loading and after a fixed number of cyclic loadings on 7-mm distal cantilever in two different connection systems using all-on-four prosthetic model. Methods: Two equal models of an edentulous mandible rehabilitated with all-on-four technique with two types of abutment system (MUA and OT-Bridge) supporting a hybrid prosthesis, were used. Initial torque values of the prosthetic fixing screw, after ten minutes from initial screw tightening and after 400,000 repeated loadings were registered using a mechanical torque gauge. Differences between initial and final torque values were reported for each anchoring system and the two systems were finally compared. Results: No statistically significant differences regarding the loss of preload between MUA and OT-Bridge system were found after 400,000 cyclic loadings; however, in MUA system it was found between anterior and posterior implant screws. A significant difference in preload loss was found only for MUA system comparing the initial screw torque to that measured after 10 min from the tightening in absence of cyclic loadings. Conclusions: Within the limits of the present study, MUA and OT-Bridge may be considered reliable prosthetic anchoring systems able to tolerate repeated cyclic occlusal loads on distal cantilever in all-on-four rehabilitation model without any significant loss of preload in screw tightening. View Full-Text
Keywords: preload loss; conical abutment screw; multi-unit-abutment; OT-Bridge; prosthetic connection; implant-supported prosthesis; loosening torque; tightening torque preload loss; conical abutment screw; multi-unit-abutment; OT-Bridge; prosthetic connection; implant-supported prosthesis; loosening torque; tightening torque
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MDPI and ACS Style

Catapano, S.; Ferrari, M.; Mobilio, N.; Montanari, M.; Corsalini, M.; Grande, F. Comparative Analysis of the Stability of Prosthetic Screws under Cyclic Loading in Implant Prosthodontics: An In Vitro Study. Appl. Sci. 2021, 11, 622. https://doi.org/10.3390/app11020622

AMA Style

Catapano S, Ferrari M, Mobilio N, Montanari M, Corsalini M, Grande F. Comparative Analysis of the Stability of Prosthetic Screws under Cyclic Loading in Implant Prosthodontics: An In Vitro Study. Applied Sciences. 2021; 11(2):622. https://doi.org/10.3390/app11020622

Chicago/Turabian Style

Catapano, Santo; Ferrari, Mattia; Mobilio, Nicola; Montanari, Marco; Corsalini, Massimo; Grande, Francesco. 2021. "Comparative Analysis of the Stability of Prosthetic Screws under Cyclic Loading in Implant Prosthodontics: An In Vitro Study" Appl. Sci. 11, no. 2: 622. https://doi.org/10.3390/app11020622

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