International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 8 , ISSUE 4 ( October-December, 2018 ) > List of Articles

ORIGINAL ARTICLE

Cyclic Loading Impact on Screw Loosening of Internally Connected Implants: An Experimental Study

Mohamed Y Abdelfattah, Mohammed K Fahmi

Keywords : Abutments, Cyclic loading, Implant, Screw loosening

Citation Information : Abdelfattah MY, Fahmi MK. Cyclic Loading Impact on Screw Loosening of Internally Connected Implants: An Experimental Study. Int J Prosthodont Restor Dent 2018; 8 (4):102-107.

DOI: 10.5005/jp-journals-10019-1216

License: CC BY-NC 4.0

Published Online: 00-12-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: The aim of this study was to assess the impact of cyclic loading on screws attaching four different abutments to internally connected implants. Materials and methods: Four groups (seven implants each) of dissimilar abutments: Straumann solid abutment (group I), southern implants solid abutment (group II), implant direct straight abutment (group III), and Blue Sky Bio regular platform abutment (group IV). Abutments were connected to Straumann tissue-level implants. Each implant was rigidly secured in a stainless steel cylindrical jig. A torque controller was used to tighten the abutments at 35 Ncm. A 150 N cyclic load for 1 million cycles was applied to the implant at a 30° angle to the long axis to the implants. Periotest values (PTVs) were measured before and after cyclic loading and a digital torque gauge was used to detect the removal torque values (RTVs) of abutments. The data were analyzed statistically using SPSS statistical software. Kruskal–Wallis tests and one-way analysis of variance (ANOVA) were used to compare RTVs and PTVs after application of equal loads for each group. The Spearman correlation coefficient was applied to compare RTVs and PTVs after loading. Results: The Straumann solid abutment and the southern implants abutment showed no mechanical failures. Screws fracture was noted in nearly 85% of implant direct abutment, and 55% of the Blue Sky Bio abutments. The final mean PTV of the Blue Sky Bio abutments, the southern implants, and implant direct straight abutment was considerably higher than the final mean PTVs of Straumann solid abutment. The initial mean PTV (–4.36 ± 0.47) was lower than the final mean PTV (4.85 ± 5.58). The Straumann solid abutment RTVs values were considerably higher than that of the other abutments. Conclusion: Abutments from the different manufacturers have different physical and chemical characteristics so there will be a potential risk of mechanical failure when the interchangeable abutments are used. Clinical significance: The use of an abutment manufactured by the same implant company is highly recommended for the avoidance of loosening of the abutment screws.


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  1. Theoharidou A, Petridis HP, Tzannas K, Garefis P. Abutment screw loosening in single-implant restorations: a systematic review. Int J Oral Maxillofac Implants. 2008;23(4):681-690.
  2. Michalakis KX, Calvani P, Muftu S, Pissiotis A, Hirayama H. The effect of different implant-abutment connections on screw joint stability. J Oral Implantol. 2014 Apr;40(2):146-152. 3 Venturea J, Jimenez-Castrllanos E, Romero J, Enrile F. Tooth fracture in fixed full arch implant supported acrylic resin prostheses: A retrospective clinical study. Int J Prosthodont 2016;29:161-165.
  3. Bansal S, Aras MA, Chitre V. Guidelines for treatment planning of mandibular implant overdenture. J Dent Implant 2014;4(1):86-90.
  4. Tunchel S, Blay A, Kolerman R, Mijiritsky E, Shibli JA. 3D printing/additive manufacturing single titanium dental implants: A prospective multicenter study with 3 years of follow-up. Int J Dent 2016;5:1-9.
  5. Schwarz MS. Mechanical complication of dental implants. Clin Oral Implants Res 2000;11:156-158.
  6. Sutter F, Weber HP, Sorensen J, Belser U. The new restorative concept of the ITI dental implant system: Design and engineering. Int J Periodontics Restorative Dent 1993;13(5):408-431.
  7. Carneiro TD, Dietrich L, Prudente MS, da Silva Neto JP, do Prado CJ, De Araújo CA, et al. Fracture Resistance of Internal Conical and External Hexagon: Regular and Narrow Implant- Abutment Assemblies. Implant Dent. 2016 Aug 1;25(4):510-514.
  8. Merz BR, Hunenbart S, Belser UC. Mechanics of the implantabutment connection: An 8-degree taper compared to a butt joint connection. Int J Oral Maxillofac Implants 2000;15(4):519-526.
  9. Khraisat A, Stegaroiu R, Nomura S, Miyakawa O. Fatigue resistance of two implant/abutment joint designs. J Prosthet Dent 2002;88: 604-610.
  10. Cehreli MC, Akca K, Iplikcioglu H, Sahin S. Dynamic fatigue resistance of implant-abutment junction in an internally notched Morse taper implant: Influence of abutment design. Clin Oral Implants Res 2004;15(4):459-465.
  11. Gilbert AB, Yilmaz B, Seidt JD, McGlumphy EA, Clelland NL, Chien HH. Three-dimensional displacement of nine different abutments for an implant with an internal hexagon platform. Int J Oral Maxillofac Implants 2015;30(4):781-788.
  12. Kim SK, Koak JY, Heo SJ, Taylor TD, Sook R, Lee SY. Screw loosening with interchangeable abutments in internally connected implants after cyclic loading. Int J Oral Maxillofac Implants 2012;27(1):42-47.
  13. Veeraiyan DK. Textbook of Prosthodontics. The Health Sciences. Japee Brothers Medical Publisher (P) Ltd Publisher. 2017; 2nd. Ed. p. 1055-1079.
  14. Martin WC, Woody RD, Miller BH, Miller AW. Implant abutment screw rotations and preloads for four different screw materials and surfaces. J Prosthet Dent 2001;86(1):24-32.
  15. Sakaguchi R, Ferracane J, Powers J. Craig's Restorative Dental Materials Elsevier, Inc 2018; 14th. ed. p. 66-69.
  16. Cibirka RM, Nelson SK, Lang BR, Rueggeberg FA. Examination of the implant-abutment interface after fatigue test. J Prosthet Dent 2001;85(3):268-275.
  17. Hoyer SA, Stanford CM, Buranadham S, Fridrich T, Wagner J, Grat- ton D. Dynamic fatigue properties of dental implant-abutment interface: Joint opening in wide-diameter vs standarddiameter hex-type implants. J Prosthet Dent 2001;85(6):599-607.
  18. Faulkner MG, Wolfaard JE, Chan A. Measuring abutment/implant joint integrity with the Periotest instrument. Int J Oral Maxillofac Implants 1999;14(5):681-688.
  19. Norton MR. Assessment of cold welding properties of the internal conical interface of two commercially available implant systems. J Prosthet Dent 1999;81(2):159-166.
  20. Squier RS, Psoter WJ, Taylor TD. Removal torques of conical, tapered implant abutment: The effect of anodization and reduction of surface area. Int J Oral Maxillofac Implants 2002;17(1):24-27.
  21. Kim JM, Han JS, Lee JB. A study of screw loosening after dynamic continuous fatigue test of several abutment screw. J Korean Acad Prosthodont 2003;41(4):519-530.
  22. Standlee JP, Caputo AA, Chwu MY, Sun TT. Accuracy of mechanical torque-limiting devices for implants. Int J Oral Maxillofac Implants. 2002 Mar 1;17(2):220-224.
  23. Stegaroiu R, Yamada H, Kasukari H, Miyakawa O. Retention and failure mode after cyclic loading in two post and core systems. J Prosthet Dent 1996;75(5):506-511.
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