ORIGINAL ARTICLE

 

A comparative study of microstrain around three-morse taper implants with machined and plastic copings under axial loading

 

 

Celina Wanderley de Abreu^I; Luis Gustavo Oliveira de Vasconcellos^II; Ivan Balducci^III; Renato Sussumu Nishioka^IV

^IDDs, MSc, PhD Student in Prosthodontics, Department of Prosthodontics, Piracicaba Dental School, University of Campinas, Brazil
^IIPostgraduate Student, Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University, Brazil
^IIIProfessor, Department of Community Dentistry and Pediatric Clinic, São José dos Campos Dental School, São Paulo State University, Brazil
^IVProfessor, Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University, Brazil

Correspondence

 

 

---

ABSTRACT

AIM: To evaluate the occurrence of microstrain around morse taper implants in straight configuration under axial load in a cast monoblock framework.
METHODS: Three implants were inserted in a polyurethane block and microunit abutments were installed on the implants with 20 Ncm torque. Plastic and machined copings were adapted on the preset waxing to fabricate the framework (n=5). Four strain gauges were attached on the upper surface of the block and then each framework was tightened on the abutments and a vertical load of 30 kg was applied to five points of the framework.
RESULTS: The data obtained in the strain gauge analysis were subjected to twoway ANOVA and Tukey's test (α=0.05). There was statistically significant difference (p=0.0222) for the factor application point and the mean microstrain values were: application point B 402,04με, point A 401.21με, point E 390.44με , point D 341.76με and point C 309.19 με.
CONCLUSIONS:There was no microstrain difference between plastic and machined copings during axial loading. Difference in the application point was observed, but remained within bone physiological limits.

Keywords: dental implant, fixed prosthesis, axial load, strain gauge, morse taper.

---

 

 

Full text available only in PDF format.

 

 

References

1. Solnit GS, Schneider RL. An alternative to splinting multiple implants: use of the ITI system. J Prosthodont. 1998; 7: 114-9.         [ Links ]

2. Sutter F, Schroeder A, Buser D. The new concept of ITI hollow-cylinder and hollow-screw implants: Part 1. Engineering and design. Int J Oral Maxillofac Implants. 1988; 3: 161-72.         [ Links ]

3. Çehreli M C, Iplikçioglu H, Bilir Ö G. The influence of the location of load transfer on strains around implants supporting four unit cement-retained fixed prostheses: in vitro evaluation of axial versus off-set loading. J Rehabil. 2002; 29: 394-400.         [ Links ]

4. Taylor TD, Agar JR, Vogiatzi T. Implant Prosthodontics: current perspective future directions. Int J Oral Maxillofac Implants. 2000; 15: 66-75.         [ Links ]

5. Glantz PO, Rangert B, Svensson A, Stanfford GD, Arnvidarson B, Randow K. et al. On clinical loading of osseointegrated implants. A methodological and clinical study. Clin Oral Implants Res. 1993 4: 99-105.         [ Links ]

6. Richter EJ. Basic biomechanics of dental implants in prosthetic dentistry. J Prosthet Dent. 1989 61(5): 602-9.         [ Links ]

7. Assif D, Marshak B, Horowitz A. Analysis of load transfer and stress distribution by an implant-supported fixed partial denture. J Prosthet Dent. 1996; 75: 285-91.         [ Links ]

8. Bidez MW, Misch CE. Force transfer in implant dentistry: basic concepts and principals. J Oral Implantol. 1992; 23: 264-74.         [ Links ]

9. Branemark PI, Zarb GA, Albrektsson T. Tissue-integrated prosthesis. Osseointegration in clinical dentistry. Chicago: Quintessence; 1987. 129p.         [ Links ]

10. Hekimoglu C, Anil N, Cehreli M. Analysis of strain around endosseous implants opposing natural teeth or implants. J Prosthet Dent. 2004; 92: 441-6.         [ Links ]

11. Heckmann SM, Karl M, Wichmann MG, Winter W, Graef F, Taylor TD. Cement fixation and screw retention: parameters of passive fit. An in vitro study of three-unit implant-supported fixed partial dentures. Clin Oral Implant Res. 2004; 15: 466-73.         [ Links ]

12. May KB, Edge MJ, Russell MM, Razzoog ME, Lang BR. The precision of fit at the implant prosthodontic interface. J Prosthet Dent. 1997; 77: 497-502.         [ Links ]

13. Sahin S, Çehreli MC, Yalçin E. The influence of functional forces on the biomechanics of implant-supported prostheses – a review. J Dent. 2002; 30: 271-82.

14. Roberts WE. Fundamental principles of bone physiology, metabolism and loading. In: Naert I, van Steenberghe D, Worthington P, editors. Osseointegration in oral rehabilitation. An introductory textbook. London: Quintessence; 1993. p.163-4.         [ Links ]

15. Hoshaw SJ, Brunski JB, Cochran GVB. Mechanical loading of Branemark implants affects interfacial bone modeling and remodeling. Int J Oral Maxillofac Implants. 1994; 9: 345-60.         [ Links ]

16. Frost H M. Wolff's law and bone's structural adaptations to mechanical usage: an overview for clinicians. Angle Orthod. 1994; 64: 175-88.         [ Links ]

17. Wiskott H W, Belser U C. Lack of integration smooth titanium surfaces: a working hypothesis based on strains generated in the surrounding bone. Clin Oral Implants Res. 1999; 10: 4429-44.         [ Links ]

18. Millington ND, Leung T. Inaccurate fit of implant superstructures. Part 1. Stresses generated on the superstructure relative to the size of fit discrepancy. Int J Prosthodont. 1995; 8: 511–6.

19. Mericske-Stern R, Assal P, Merickse E, Ing WB. Oclussal force and oral tactile sensibility measured in partially edentulous patients with ITI implants. Int J Oral Maxillofac Implants. 1995; 10: 345-54.         [ Links ]

20. Branemark PI, Adell R, Breine U, Hansson BO, Lindstrom J, Olsson A. Intra-osseous anchorage of dental prostheses. I. Experimental studies. Scand J Plast Reconstr Surg. 1969; 3: 81-100.         [ Links ]

21. Smedberg JI, Nilner K, Rangert B, Svensson SA, Glantz SA. On the influence of superstructure connection on implant preload: a methodological and clinical study. Clin Oral Implants Res. 1996; 7: 55-63.         [ Links ]

22. Adell R, Lekholm U, Rockler B, Branemark PI. A 15-year study of osseointegrated implants in the treatment of the edentulous jaw. Int J Oral Surg. 1981; 10: 387-416.         [ Links ]

23. Duyck J, Van Oosterwyck H, Vander Stolen J, De Cooman M, Puers R, Naert I. Magnitude and distribution of occlusal forces on oral implants supporting fixed prostheses: an in vivo study. Clin Oral Impl Res. 2000; 11: 465-75.         [ Links ]

24. Heckmann SM, Karl M, Winter W, Grael F, Taylor TD. Loading of bone surrounding implants through three-unit fixed partial denture fixation: a finite elements analysis based on in vitro and in vivo strain measurements. Clin Oral Implants Res. 2006; 17: 345-50.         [ Links ]

25. Çehreli M, Duyck J, De Cooman M, Puers R, Naert I. Implant design and interface force transfer: a photoelastic and strain-gauge analysis. Clin Oral Implants Res. 2004; 15: 249-57.         [ Links ]

26. Akça K, Cehreli MC, Iplikçioglu H. A comparison of three-dimensional finite element stress analysis with in vitro strain gauge measurements. Int J Prosthodont. 2002; 15: 115-21.         [ Links ]

27. Watanabe F, Hata Y, Komatsu S, Ramos TC, Fukuda H. Finite element analysis of the influence implant location, loading position, and load direction on stress distribution. Odontology. 2003. 91: 31-6.         [ Links ]

28. Huang HL, Lin CL, Ko CC, Chang CH, Hsu JT, Huang JS. Stress analysis of implant-supported partial prostheses in anisotropic mandibular bone: inline versus offset placements of implants. J Oral Rehabil. 2006; 33: 501-8.         [ Links ]

29. Karl M, Wichmann MG, Winter W, Graef F, Taylor T, Heckmann SM. Influence of fixation mode and superstructure span upon strain development of implant fixed partial dentures. J Prosthodont. 2008; 17: 3-8.         [ Links ]

30. Kan JYK, Rungcharassaeng K, Bohsali K, Goodacre CJ, Lang BR. Clinical Methods for evaluating implant framework fit. J Prosthet Dent. 1999; 81: 7-13.         [ Links ]

 

 

Correspondence to:
Celina Wanderley de Abreu
University of Campinas,
Piracicaba Dental School, SP.
Madre Cecília Street # 1560/11A, Centro.
Postal code:13400490, Piracicaba,SP. Brazil.
E-mail: celwanderley@fop.unicamp.br

Received for publication: August 06, 2009
Accepted: March 11, 2010