SciELO - Scientific Electronic Library Online

 
vol.9 número1 índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Brazilian Journal of Oral Sciences

versão On-line ISSN 1677-3225

Braz. J. Oral Sci. vol.9 no.1 Piracicaba Jan./Mar. 2010

 

ORIGINAL ARTICLE

 

Implant-supported titanium framework: photoelastic analysis before and after spark erosion procedure

 

 

Mauricio Pompeu CarielloI; Mauro Antonio de Arruda NóbiloII; Guilherme Elias Pessanha HenriquesII; Marcelo Ferraz MesquitaIII; Rafael Leonardo XediekIII; Andréa Fabiana de LiraI

IPhD level student, Department of Prosthodontics and Periodontology, Area of Fixed Denture, Piracicaba Dental School, State University of Campinas, Brazil
IIProfessor, Department of Prosthodontics and Periodontology, Area of Fixed Denture, Piracicaba Dental School, State University of Campinas, Brazil
IIIProfessor, Department of Prosthodontics and Periodontology, Area of Complete Denture, Piracicaba Dental School, State University of Campinas, Brazil

Correspondence

 

 


ABSTRACT

AIM: This study used a photoelastic analysis to evaluate the passive fit of titanium cast laser welding frameworks before and after spark erosion procedure.
METHODS:
A stainless steel cast was used in order to reproduce a human mandible. Five Multi-Unit abutment analogs were attached to this cast and 6 frameworks were produced in commercial pure titanium. The cast was molded and a photoelastic matrix was produced incorporating 5 dental implants with Multi-Unit abutments. All samples were subjected to a laser welding. The precision of adjustments within a range of 0.5 μm was evaluated under microscope observation. The best fitted framework was selected and subjected to a photoelastic analysis (Group I). The tightening of the screws was in 3 predetermined sequences (1,2,3,4,5/ 5,4,3,2,1/ 3,2,4,1,5). Then the same framework was subjected to a refinement by spark erosion technique (Group II) and evaluated by photoelastic analysis.
RESULTS: The sequence (3,2,4,1,5) achieved better results in both groups. A larger number of fringes were observed around the median implants in all sequences in both groups.
CONCLUSIONS: The titanium cast laser welded frameworks processes associated with spark erosion procedure improves significantly the marginal framework adaptation and is effective for its passive fit.

Keywords: titanium, misfit, implant, framework.


 

 

Full text available only in PDF format.

 

 

References

1. Kenney R, Richards MW. Photoelastic stress patterns by implant-retained overdentures. J Prosthet Dent. 1998; 80: 559-64.         [ Links ]

2. Waskewicz GA, Ostrowski JS, Parks VJ. Photoelastic analysis of stress distribution transmitted from fixed prostheses attached to osseointegrated implants. Int J Oral Maxillofac Implants. 1994; 9: 405-11.         [ Links ]

3. Cleland NL, Van Putten MC. Comparison of strains produced in a bone stimulant between conventional cast and resin-luted implant frameworks. Int J Oral Maxillofac Implants. 1997; 12: 793-9.         [ Links ]

4. Wang RR, Welsh GE. Joining titanium materials with tungsten inert gas laser welding and infrared brazing. J Prosthet Dent. 1995; 74: 521-30.         [ Links ]

5. Wee AG, Aquilino SA, Schneider R. Strategies to achieve fit in implant prosthodontics: a review of the literature. Int J Prosthod. 1999; 12: 167-78.         [ Links ]

6. Jemt T, Lindén B. Fixed implant-supported prosthesis with welded titanium frameworks. Int J Periodontics Restorative Dent. 1992; 12: 177-84.         [ Links ]

7. Weber H, Frank G. Spark erosion procedure: a new method for extensive combined fixed and removable prosthodontic care. J Prosthet Dent. 1993; 69: 222-7.         [ Links ]

8. Eisenmann E, Mokabberi A, Walter MH, Freesmeyer WB. Improving the fit of implant-supported superstructures using the spark erosion technique. Int J Oral Maxillofac Implants. 2004; 19: 810-8.         [ Links ]

9. Wang S, Hobkirk JA. Load distribution on implants with a cantilevered superstructure: an in vitro pilot study. Implant Dent. 1996; 5: 36-42.         [ Links ]

10. Watanabe F, Uno I, Hata I, Neuendorff G, Kirsch A. Analysis of stress distribution in a screw-retained implant prosthesis. Int J Oral Maxillofac Implants. 2000; 15: 209-18.         [ Links ]

11. Sertgoz A. Finite element analysis study of the effect of superstructure material on stress distribution in an implant-supported fixed prosthesis. Int J Prosthodont. 1997; 10: 19-27.         [ Links ]

12. Thayer HH, Caputo A. A Photoelastic stress analysis of overdenture attachments. J Prosthet Dent. 1980; 43: 611-7.         [ Links ]

13. Haraldson T. A photoelastic study of some biomechanical factors affecting the anchorage of osseointegrated implants in the jaw. Scand J Plast Reconstr Surg. 1980; 14: 209-14.         [ Links ]

14. Fernandes CP, Glantz PJ, Svensson SA, Bergmark A. Reflection photoelasticity: a new method for studies of clinical mechanics in prosthetic dentistry. Dental Mat. 2003; 19: 106-7.         [ Links ]

15. Brosh T, Pilo R, Sudai D. The influence of abutment angulation on strain and stresses along the implant/bone interface: Comparison between two experimental techniques. J Prosthet Dent. 1998; 79: 328-34.         [ Links ]

16. Branemark P I. Osseointegration and its experimental background. J Prosthet Dent. 1983; 50: 399-410.         [ Links ]

17. Cariello MP, Nóbilo MAA. Photoelastic analysis of tensions induced over implant superstructures manufactured through CAD/CAM method, border soldering and one-piece technique [dissertation]. Piracicaba: UNICAMP/ FOP; 2007. 93p.         [ Links ]

18. Jemt T. Failures and complications in 391 consecutively inserted fixed prostheses supported by Branemark implants in edentulous jaws: a study of treatment from the time of prosthesis placement to the first annual checkup. Int J Oral Maxillofac Implants. 1991; 6: 270-6.         [ Links ]

19. Van Roekel NB. Electrical discharge machining in dentistry. Int J Prosthod. 1992; 5: 114-21.         [ Links ]

20. Gordon TE, Smith DL. Laser welding of prostheses – an initial report. J Prosthet Dent. 1970; 24: 472-6.         [ Links ]

21. Lindquist LW, Rockler B, Carlsson GE. Bone resorption around fixtures in edentulous patients treated with mandibular fixed tissue-integrated prostheses. J Prosthet Dent. 1988; 59: 59-63.         [ Links ]

22. Evans DB. Correcting the fit of implant-retained restorations by electric discharge machining. J Prosthet Dent. 1997; 77: 212-5.         [ Links ]

23. Bernardes SR, Neves FD. Tension analysis of a one-piece framework over different connections in implants [dissertation]. Uberlândia: Dental School of Uberlândia; 2004. 192p.         [ Links ]

 

 

Correspondence to:
Mauricio Pompeu Cariello
Rua Leonardo Mota, 620, apto 1101,
Meireles, Fortaleza – CE
E-mail: cariello@fop.unicamp.br

Received for publication: September 09, 2009
Accepted: March 13, 2010