The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

COMPARATIVE ACCURACY OF THE SPLINTED AND UNSPLINTED IMPRESSION METHODS FOR INTERNAL CONNECTION

  • Choi, Jung-Han (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Kim, Chang-Whe (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Jang, Kyung-Soo (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Lim, Young-Jin (Department of Prosthodontics, Graduate School, Seoul National University)
  • Published : 2005.06.01
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Abstract

Statement of problem. Accurate impression is essential to success of implant prostheses. But there have been few studies about the accuracy of fixture-level impression techniques in internal connection implant systems. Purpose. The purpose of this study was to compare the accuracy of two fixture-level impression techniques in two conditions (parallel and divergent) and to assess the effect of tightening sequences and forces on stresses generated on superstructures in internal connection implant system (Astra Tech). Material and methods. Two metal master frameworks made from two abutments (Cast-to Abutment ST) each and a corresponding, passively fitting, dental stone master cast with four fixture replicas (Fixture Replica ST) were fabricated. Ten dental stone casts for each impression techniques (direct unsplinted & splinted technique) were made with vinyl polysiloxane impressions from the master cast. Strain gauges for each framework were fixed midway between abutments to measure the degree of framework deformation on each stone cast. Pairs of strain gauges placed opposite each other constituted one channel (half Wheatstone bridge) to read deformation in four directions (superior, inferior, anterior, and posterior). Deformation data were analyzed using one-way ANOVA and the Tukey test at the .01 level of significance. And the effect of tightening sequences (right-to-left and left-to-right) and forces (10 Ncm and 20 Ncm) were assessed with ten stone casts made from parallel condition by the splinted technique. Deformation data were analyzed using paired t-test at the .01 level of significance. Conclusions. Within the limitations of this study, the following conclusions could be drawn. 1. Frameworks bent toward the inferior side on all casts made by both direct unsplinted and splinted impression techniques in both parallel and divergent conditions. 2. There was no statistically significant difference of accuracy between the direct unsplinted and splinted impression techniques in both parallel and divergent conditions (P>.01). 3. There was no statistically significant difference of stress according to screw tightening sequences in casts made by the splinted impression technique in parallel condition (P>.01). 4. Greater tightening force resulted in greater stress in casts made by the splinted impression technique in parallel condition (P<.01).

Keywords

References

  1. 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 https://doi.org/10.1016/S0300-9785(81)80077-4
  2. Branemark PI. Osseointegration and its experimental background. J Prosthet Dent 1983;50:399-410 https://doi.org/10.1016/S0022-3913(83)80101-2
  3. Zarb GA, Schmitt A. The longitudinal clinical effectiveness of osseointegrated dental implants: The Toronto study. Part I: Surgical results. J Prosthet Dent 1990;63:451-7 https://doi.org/10.1016/0022-3913(90)90237-7
  4. Zarb GA, Schmitt A. The longitudinal clinical effectiveness of osseointegrated dental implants: The Toronto study. Part II: The prosthetic results. J Prosthet Dent 1990;64:53-61 https://doi.org/10.1016/0022-3913(90)90153-4
  5. Tan KB, Rubenstein J, Nicholls J, Youdelis R. Three-dimensional analysis of the casting accuracy of one-piece, osseointegrated implant-retained prostheses. Int J Prosthodont 1993;6:346-63
  6. Sahin S, Cehreli MC. The significance of passive framework fit in implant prosthodontics: Current status. Implant Dent 2001;10:85-92 https://doi.org/10.1097/00008505-200104000-00003
  7. Naconecy MM, Teixeira ER, Shinkai RSA, Frasca LCF. Eng AC. Evaluation of the accuracy of 3 transfer techniques for implant-supported prostheses with multiple abutments. Int J Oral Maxillofac Implants 2004;19:192-8
  8. Assif D, Fenton A, Zarb GA, Schmitt A. Comparative accuracy of implant impression procedures. Int J Periodont Rest Dent 1992;12:113-21
  9. Assif D, Marshak B, Schmitt A. Accuracy of implant impression techniques. Int J Oral Maxillofac Implants 1996;11:216-22
  10. Vigolo P, Majzoub Z, Cordioli G. Evaluation of the accuracy of three techniques used for multiple implant abutment impressions. J Prosthet Dent 2003;89:186-92 https://doi.org/10.1067/mpr.2003.15
  11. Branemark PI, Zarb GA, Alhrektsson T. Tissue-integrated prostheses. Osseointegration in clinical dentistry. Chicago: Quintenssence, 1985:11-12, 2537.
  12. Humphries RM, Yaman P. Bloem TJ. The accuracy of implant master casts constructed from transfer impressions. Int J Oral Maxillofac Implants 1990;5:331-6
  13. Hsu CC, Millstein PL, Stein RS. A comparative analysis of the accuracy of implant transfer techniques. J Prosthet Dent 1993;69:588-93 https://doi.org/10.1016/0022-3913(93)90287-X
  14. Phillips KM, Nicholls JI, Ma T, Rubenstein J. The accuracy of three implant impression techniques: A three-dimensional analysis. Int J Oral Maxillofac Implants 1994;9:533-40
  15. Herbst D, Nel JC, Driessen CH, Becker PJ. Evaluation of impression accuracy for osseointegrated implant supported superstructures. J Prosthet Dent 2000;83:555-61 https://doi.org/10.1016/S0022-3913(00)70014-X
  16. Burawi G, Houston F, Byrne D, Claffey N. A comparison of the dimensional accuracy of the splinted and unsplinted impression techniques for the Bone-Lock implant system. J Prosthet Dent 1997;77:68-75 https://doi.org/10.1016/S0022-3913(97)70209-9
  17. Inturregui JA, Aquilino SA, Ryther JS, Lund PS. Evaluation of three impression techniques for osseointegrated oral implants. J Prosthet Dent 1993;69:503-9 https://doi.org/10.1016/0022-3913(93)90160-P
  18. Millington ND, Leung T. Inaccurate fit of implant superstructures. Part1: stresses generated on the superstructure relative to the size of fit discrepancy. Int J Prost hodont 1995;8:511-6
  19. Watanabe F, Uno I, Hata Y, Neuendorff G, Kirsch A. Analysis of stress distribution in a screw-retained implant prosthesis. Int J Oral Maxillofac Implants 2000;15:209-18
  20. Nissan J, Gross M, Shifman A, Assif D. Stress levels for well-fitting implant superstructures as a function of tightening force levels, tightening sequences, and different operators. J Prosthet Dent 2001;86:20-3 https://doi.org/10.1067/mpr.2001.115182
  21. Bartlett DW, Greenwood R, Howe L. The suitability of head-of-implant and conventional abutment impression techniques for implant-retained three unit bridges: An in vitro study. Eur J Prosthodont Rest Dent 2002;10:163-6
  22. Pagniano R, Scheid R, Clowson R, Dagefoerde R, Zardiackas L. Linear dimensional change of acrylic resins used in the fabrication of custom trays. J Prosthet Dent 1982;47:279-83 https://doi.org/10.1016/0022-3913(82)90157-3
  23. Goldfogel M, Harvey W, Winter D. Dimensional change of acrylic resin tray materials. J Prosthet Dent 1985;54:284-6 https://doi.org/10.1016/0022-3913(85)90306-3
  24. Mojon P, Oberholzer JP, Meyer JM, Belser UC. Polymerization shrinkage of index and pattern acrylic resins. J Prosthet Dent 1990;64:684-8 https://doi.org/10.1016/0022-3913(90)90296-O
  25. Davis GB, Moser JB, Brinsden GI. The bonding properties of elastomer tray adhesives. J Prosthet Dent 1976;36:278-85 https://doi.org/10.1016/0022-3913(76)90183-9
  26. American Dental Association. Revised American Dental Association specification No:19 for non-aqueous, elastomeric dental impression materials. J Am Dent Assoc 1977;94:733-41
  27. Rudd KD, O'Leary TJ, Stumf AJ. Horizontal tooth mobility in carefully screened subjects. Periodontics 1964;2:65-8
  28. Sekine H, Komiyama Y, Hotta H, Yoshida K. Mobility characteristics and tactile sensitivity of osseointegrated fixture-supporting systems. In: van Steenberghe H (ed). Tissue Integration in Oral and Maxillofacial Reconstruction [Proceedings of an International Congress, May 1985, Brussels]. Amsterdam, The Netherland: Excerpta Media 1986:326-9.
  29. Fenton AH, Assif D, Zarb GA, Schmitt A. The accuracy of implant impression procedures. J Dent Res 1991;70(special issue): 399 (abstr no. 1065)
  30. Assif D, Nissan J, Varsano I, Singer A. Accuracy of implant impression splinted technique: Effect of splinting material. Int J Oral Maxillofac Implants 1999;14:885-8
  31. Carr AB. A comparison of impression techniques for a five-implant mandibular model. Int J Oral Maxillofac Implants 1991;6:448-55
  32. Spector MR, Donovan TE, Nicholls JI. An evaluation of impression techniques for osseointegrated implants. J Prosthet Dent 1990;63:444-7 https://doi.org/10.1016/0022-3913(90)90235-5
  33. Carr AB. Comparison of impression techniques for a two-implant 15-degree divergent model. Int J Oral Maxillofac Implants 1992;7:468-75