Physicochemical and microscopic characterization of implant-abutment joints

ABSTRACT

Objective: The purpose of this study was to investigate Morse taper implant-abutment joints by chemical, mechanical, and microscopic analysis.

Materials and Methods: Surfaces of 10 Morse taper implants and the correlated abutments were inspected by field emission gun-scanning electron microscopy (FEG-SEM) before connection. The implant-abutment connections were tightened at 32 Ncm. For microgap evaluation by FEG-SEM, the systems were embedded in epoxy resin and cross-sectioned at a perpendicular plane of the implant-abutment joint. Furthermore, nanoindentation tests and chemical analysis were performed at the implant-abutment joints.

Statistics: Results were statistically analyzed via one-way analysis of variance, with a significance level of P < 0.05.

Results: Defects were noticed on different areas of the abutment surfaces. The minimum and maximum size of microgaps ranged from 0.5 μm up to 5.6 μm. Furthermore, defects were detected throughout the implant-abutment joint that can, ultimately, affect the microgap size after connection. Nanoindentation tests revealed a higher hardness (4.2 ± 0.4 GPa) for abutment composed of Ti6Al4V alloy when compared to implant composed of commercially pure Grade 4 titanium (3.2 ± 0.4 GPa).

Conclusions: Surface defects produced during the machining of both implants and abutments can increase the size of microgaps and promote a misfit of implant-abutment joints. In addition, the mismatch in mechanical properties between abutment and implant can promote the wear of surfaces, affecting the size of microgaps and consequently the performance of the joints during mastication.

Key words:

Dental implants - implant-abutment - microgaps

• REFERENCES

• 1 Byrne D, Houston F, Cleary R, Claffey N. The fit of cast and premachined implant abutments. J Prosthet Dent 1998; 80: 184-92
• 2 Lima EM, Silva WJ, Moura JS, Faot F, Del Bel Cury AA. Evaluation of surface characteristics of Ti-6Al-4V and Tilite alloys used for implant abutments. Braz Oral Res 2006; 20: 307-11
• 3 Hanawa T. Biofunctionalization of titanium for dental implant. Jpn Dent Sci Rev 2010; 46: 93-101
• 4 Piattelli A, Scarano A, Paolantonio M, Assenza B, Leghissa GC, Di Bonaventura G. et al. Fluids and microbial penetration in the internal part of cement-retained versus screw-retained implant-abutment connections. J Periodontol 2001; 72: 1146-50
• 5 Tsuge T, Hagiwara Y, Matsumura H. Marginal fit and microgaps of implant-abutment interface with internal anti-rotation configuration. Dent Mater J 2008; 27: 29-34
• 6 Pereira J, Morsch CS, Henriques B, Nascimento RM, Benfatti CA, Silva FS. et al. Removal torque and biofilm accumulation at two dental implant-abutment joints after fatigue. Int J Oral Maxillofac Implants 2016; 31: 813-9
• 7 Mish CE. Dental Implant Prosthetics. St. Louis: Mosby; 2005
• 8 Vieira AC, Ribeiro AR, Rocha LA, Celis JP. Influence of pH and corrosion inhibitors on the tribocorrosion of titanium in artificial saliva. Wear 2006; 261: 994-1001
• 9 Scarano A, Assenza B, Piattelli M, Iezzi G, Leghissa GC, Quaranta A. et al. A16-year study of the microgap between 272 human titanium implants and their abutments. J Oral Implantol 2005; 31: 269-75
• 10 Hermann JS, Schoolfield JD, Schenk RK, Buser D, Cochran DL. Influence of the size of the microgap on crestal bone changes around titanium implants. A histometric evaluation of unloaded non-submerged implants in the canine mandible. J Periodontol 2001; 72: 1372-83
• 11 Kano SC, Binon PP, Bonfante G, Curtis DA. The effect of casting procedures on rotational misfit in castable abutments. Int J Oral Maxillofac Implants 2007; 22: 575-9
• 12 Lalithamma JJ, Mallan SA, Murukan PA, Zarina R. A comparative study on microgap of premade abutments and abutments cast in base metal alloys. J Oral Implantol 2014; 40: 239-49
• 13 Broggini N, McManus LM, Hermann JS, Medina RU, Oates TW, Schenk RK. et al. Persistent acute inflammation at the implant-abutment interface. J Dent Res 2003; 82: 232-7
• 14 Broggini N, McManus LM, Hermann JS, Medina R, Schenk RK, Buser D. et al. Peri-implant inflammation defined by the implant-abutment interface. J Dent Res 2006; 85: 473-8
• 15 Souza JC, Henriques M, Oliveira R, Teughels W, Celis JP, Rocha LA. et al. Do oral biofilms influence the wear and corrosion behavior of titanium?. Biofouling 2010; 26: 471-8
• 16 Zupnik J, Kim SW, Ravens D, Karimbux N, Guze K. Factors associated with dental implant survival: A 4-year retrospective analysis. J Periodontol 2011; 82: 1390-5
• 17 Binon PP. The effect of implant/abutment hexagonal misfit on screw joint stability. Int J Prosthodont 1996; 9: 149-60
• 18 Souza JC, Henriques M, Oliveira R, Teughels W, Celis JP, Rocha LA. et al. Biofilms inducing ultra-low friction on titanium. J Dent Res 2010; 89: 1470-5
• 19 Heckmann SM, Linke JJ, Graef F, Foitzik Ch, Wichmann MG, Weber HP. et al. Stress and inflammation as a detrimental combination for peri-implant bone loss. J Dent Res 2006; 85: 711-6
• 20 Assenza B, Tripodi D, Scarano A, Perrotti V, Piattelli A, Iezzi G. et al. Bacterial leakage in implants with different implant-abutment 57 connections: An in vitro study. J Periodontol 2012; 83: 491-7
• 21 Hermann JS, Schoolfield JD, Schenk RK, Buser D, Cochran DL. Influence of the size of the microgap on crestal bone changes around titanium implants. A histometric evaluation of unloaded non-submerged implants in the canine mandible. J Periodontol 2001; 72: 1372-83
• 22 Proff P, Steinmetz I, Bayerlein T, Dietze S, Fanghänel J, Gedrange T. et al. Bacterial colonisation of interior implant threads with and without sealing. Folia Morphol (Warsz) 2006; 65: 75-7
• 23 Baggi L, Cappelloni I, Di Girolamo M, Maceri F, Vairo G. The influence of implant diameter and length on stress distribution of osseointegrated implants related to crestal bone geometry: A three-dimensional finite element analysis. J Prosthet Dent 2008; 100: 422-31
• 24 Anusavice KJ. Mechanical properties of dental materials. In: Philip's Science of Dental Materials. St. Louis: WB Saunders; 2003: p. 715-36
• 25 Souza JCM, Barbosa SL, Ariza EA, Henriques M, Teughels W, Ponthiaux P. et al. How do titanium and Ti6Al4V corrode in fluoridated medium as found in the oral cavity? An in vitro study. Mater Scie Eng 2015; 47: 384-93
• 26 Niinomi M. Recent research and development in titanium alloys for biomedical applications and healthcare goods. Sci Technol Adv Mater 2003; 4: 445-54
• 27 Souza JCM, Henriques M, Teughels W, Ponthiaux P, Celis JP, Rocha LA. Wear and Corrosion Interactions on Titanium in Oral Environment: Literature Review. J Bio Tribo-Cor 2015; 1: 13
• 28 McGlumphy EA, Mendel DA, Holloway JA. Implant screw mechanics. Dent Clin North Am 1998; 42: 71-89
• 29 Noronha Oliveira M, Schunemann WVH, Mathew MT, Henriques B, Magini RS, Teughels W. et al. Can degradation products released from dental implants affect peri-implant tissues?. J Period Res 2017; [In press]
• 30 Zysset PK, Guo XE, Hoffler CE, Moore KE, Goldstein SA. Elastic modulus and hardness of cortical and trabecular bone lamellae measured by nanoindentation in the human femur. J Biomech 1999; 32: 1005-12
• 31 Oh KT, Kim KN. Electrochemical properties of suprastructures galvanically coupled to a titanium implant. J Biomed Mater Res B Appl Biomater 2004; 17