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Bacchi A, Regalin A, Bhering CL, et al. Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating. J Adv Prosthodont. 2015;7(5):375-9doi: 10.4047/jap.2015.7.5.375.
Bacchi, A., Regalin, A., Bhering, C. L., Alessandretti, R., & Spazzin, A. O. (2015). Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating. The journal of advanced prosthodontics, 7(5), 375-9. https://doi.org/10.4047/jap.2015.7.5.375
Bacchi, Atais, et al. "Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating." The journal of advanced prosthodontics vol. 7,5 (2015): 375-9. doi: https://doi.org/10.4047/jap.2015.7.5.375
Bacchi A, Regalin A, Bhering CL, Alessandretti R, Spazzin AO. Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating. J Adv Prosthodont. 2015 Oct;7(5):375-9. doi: 10.4047/jap.2015.7.5.375. Epub 2015 Oct 28. PMID: 26576253; PMCID: PMC4644778.
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J Adv Prosthodont. 2015 Oct;7(5):375-9. doi: 10.4047/jap.2015.7.5.375. Epub 2015 Oct 28.

Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating.

The journal of advanced prosthodontics

Atais Bacchi, Alexandre Regalin, Claudia Lopes Brilhante Bhering, Rodrigo Alessandretti, Aloisio Oro Spazzin

Affiliations

  1. Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials, Brazil.
  2. Piracicaba Dental School, Campinas State University, Prosthodontics and Periodontics, Brazil.
  3. University of Passo Fundo, Post-graduate Program in Dentistry, Dental School, Brazil.

PMID: 26576253 PMCID: PMC4644778 DOI: 10.4047/jap.2015.7.5.375

Abstract

PURPOSE: The purpose of this study was to evaluate the influence of tightening technique and the screw coating on the loosening torque of screws used for Universal Abutment fixation after cyclic loading.

MATERIALS AND METHODS: Forty implants (Titamax Ti Cortical, HE, Neodent) (n=10) were submerged in acrylic resin and four tightening techniques for Universal Abutment fixation were evaluated: A - torque with 32 Ncm (control); B - torque with 32 Ncm holding the torque meter for 20 seconds; C - torque with 32 Ncm and retorque after 10 minutes; D - torque (32 Ncm) holding the torque meter for 20 seconds and retorque after 10 minutes as initially. Samples were divided into subgroups according to the screw used: conventional titanium screw or diamond like carbon-coated (DLC) screw. Metallic crowns were fabricated for each abutment. Samples were submitted to cyclic loading at 10(6) cycles and 130 N of force. Data were analyzed by two-way ANOVA and Tukey's test (5%).

RESULTS: The tightening technique did not show significant influence on the loosening torque of screws (P=.509). Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).

CONCLUSION: The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

Keywords: Dental prosthesis retention; Implant-supported dental prosthesis; Prosthesis loosening; Single-tooth dental implant

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