The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

THE DIMENSIONAL CHANGE OF CAST IMPLANT BARS AFTER LABORATORY PROCEDURE

  • Kwon, Ji-Yung (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Chang-Whe (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Lim, Young-Jun (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Myung-Joo (Department of Prosthodontics, College of Dentistry, Seoul National University)
  • Published : 2007.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Statement of Problems. The precision of fit between the bearing surfaces of implant abutments and the prosthesis framework has been considered fundamental to implant prosthodontic protocol. Purpose. The study aimed to investigate the effect of laboratory procedure on the dimensional accuracy of cast implant bars. Material and methods Thirty implant bars were fabricated on a metal master model. The gap distances were measured at the right implant abutment replica-gold cylinder interface after casting procedure. The bar length data of precasting and postcasting state were collected and analyzed. Results. The mean gap distance found after casting was $106.3{\mu}m$ for buccal side, $122.1{\mu}m$ for distal side and $117.1{\mu}m$ for the lingual side. The mean bar length was $17964.7{\mu}m$ at precasting measurement, $17891.6{\mu}m$ at postcasting measurement. The mean change of bar length was $-73.1{\mu}m$. Conclusion. Even though the techniques used in this study strictly followed the guidelines established in the literature, the 30 cast implant bars evaluated all yielded gap distances that were beyond acceptable accuracy. There was a statistically significant difference between precasting and postcasting bar length (P<0.01). There was a decreasing tendency in bar length after casting procedure. It was necessary to correct this dimensional change from laboratory procedure by some corrective methods.

Keywords

References

  1. Bidez MW, McLoughlin SW, Chen Y et al. Finite element analysis of two-abutment Harder bar designs. Implant Dent 1993;2:107-114 https://doi.org/10.1097/00008505-199305000-00008
  2. Rangert B, Jemt T, J?rneus L. Forces and moments on Branemark implants. Int J Oral Maxillofac Implants 1989;4:241-247
  3. Jemt T, Linden B, Lekholm U. Failures and complications in 127 consecutively placed fixed partial prostheses supported by Branemark implants: from prosthetic treatment to first annual checkup. Int J Oral Maxillofac Implants 1992;7:40-44
  4. Hoshaw S, Brunski J, Cochran G. Mechanical loading of Branemark fixtures affects interfacial bone modelling and remodelling. Int J Oral Maxillofac Implants 1994;9:345-360
  5. Zarb GA, Symington JM. Osseointegrated dental implants: preliminary report on a replication study. J Prosthet Dent 1983;50:271-276 https://doi.org/10.1016/0022-3913(83)90029-X
  6. Sones AD. Complications with osseointegrated implants. J Prosthet Dent 1989;62:581-585 https://doi.org/10.1016/0022-3913(89)90084-X
  7. Kallus T, Bessing C. Loose gold screws frequently occur in full-arch fixed prostheses supported by osseointegrated implants after 5years. Int J Oral Maxillofac Implants 1994;9:169-178
  8. Binon PP. The effect of implant/abutment hexagonal misfit on screw joint stability. Int J Prosthodont 1996;9:149-160
  9. Pietrabissa R, Gionso L, Quaglini V, Martino E, Simion M. An in vitro study on compensation of mismatch of screw versus cement-retained implant supported fixed prostheses. Clin Oral Implants Res 2000;11:448-457 https://doi.org/10.1034/j.1600-0501.2000.011005448.x
  10. Jemt T, Linden B. Fixed implant-supported prostheses with welded titanium frameworks. Int J Periodont Rest Dent 1992;12:177-184
  11. Jemt T, Book K. Prosthesis misfit and marginal bone loss in edentulous implant patients. Int J Oral Maxillofac Implants 1996;11:620-625
  12. Jemt T, Lekholm U. Measurements of bone and framework deformations induced by misfit of implants superstructures. A pilot study in rabbits. Clin Oral Implants Res 1998;9:272-280 https://doi.org/10.1034/j.1600-0501.1998.090408.x
  13. Carr AB, Gerard DA, Larsen PE. The response of bone in primates around unloaded dental implants supporting prostheses with different levels of fit. J Prosthet Dent 1996;76:500-509 https://doi.org/10.1016/S0022-3913(96)90008-6
  14. Carr AB, Stewart RB. Full-arch implant framework casting accuracy: preliminary in vitro observation for in vivo testing. J Prosthodont 1993;2: 2-8 https://doi.org/10.1111/j.1532-849X.1993.tb00373.x
  15. Linke BA, Nicholls JI, Faucher RR. Distortion analysis of stone casts made from impression materials. J Prosthet Dent 1985;54:794-802 https://doi.org/10.1016/0022-3913(85)90473-1
  16. Assif D, Marshak B, Schmidt A. Accuracy of implant impression techniques. Int J Oral Maxillofac Implants 1996;11:216-222
  17. Humphries RM, Yaman P, Bloem T. The accuracy of implant master casts constructed from transfer impressions Int J Oral Maxillofac Implants 1990;5:331-336
  18. Gettleman L, Ryge G. Accuracy of stone, metal and plastic die material. J Calif Dent Assoc 1970;46:28- 31
  19. White GE. Osseointegrated Dental Technology. Chicago: Quintessence 1995:123-124
  20. Adell R, Lekholm U, Rockler B, Branemark P-I. A 15-year study of osseointegrated implant in the treatment of the edentulous jaws Int J Oral Surg 1981;10:387-416 https://doi.org/10.1016/S0300-9785(81)80077-4
  21. Tan KB, Rubenstein JE, Nicholls JI, Yuodelis RA. Three-dimensional analysis of the casting accuracy of one-piece, osseointegrated implant-retained prostheses. Int J Prosthodont 1993;6:346-363
  22. Adell R, Eriksson B, Lekholm U, Branemark P-I, Jemt T. A long-term follow-up of osseointegrated implants in the treatment of totally edentulous jaws. Int J Oral Maxillofac Implants 1990;5:347-359