The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

EVALUATION OF THE ACCURACY OF FIXTURE-LEVEL IMPRESSION TECHNIQUE FOR INTERNAL CONNECTION IMPLANT USING CLINICAL METHODS

임상적 방법을 이용한 내부연결 임플랜트에서 고정체수준 인상법의 정확도 평가

  • Choi Jung-Han (Department of Prosthodontics, The Institute of Oral Health Science, Samsung Medical Center)
  • 최정한 (삼성서울병원 치과진료부 보철과)
  • Published : 2006.08.01
Download PDF
⟨ Previous Next ⟩

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 technique in internal connection implant system. Purpose: This study evaluated the accuracy of splinted fixture-level impression technique using clinical methods and the effect of internal hex on fit of superstructure in internal connection implant system (Astra Tech). Material and method : Two metal master frameworks made from two abutments (Cast-to Abutment ST) each for parallel and divergent conditions and a corresponding. passively fitting, dental stone master cast with four future replicas (Fixture Replica ST) were fabricated. Ten dental stone casts were made with vinyl polysiloxane impressions from the master cast by acrylic resin splinted fixture-level impression technique. To evaluate the accuracy of impression technique, the fit of master frameworks for test models was evaluated using screw resistance test (SRT) and one-screw test. The results of SRT were recorded as SRT values from grade 1 to grade 5 by 1/4 turn. And to evaluate the effect of hex on fit of superstructure, the same tests were performed after removing hexes of master frameworks. Results: 1. There was only one case (2.5%) showing SRT value of test model below ade 2 in total before and after removing hexes of master frameworks. And, by removing hexes. SRT values decreased in only one test model (5%) and did not change in 17 test models (85%). 2. SRT values of the 1$^{st}$ screws were grade 2 in 80% of cases before, and grade 1 in 80% of cases after removing hexes. And, by removing hexes, SRT values decreased in 72.5% of cases. 3. SRT values of the 2$^{nd}$ screws were grade 3 in 85% of cases before, and grade 3 in 95% of cases after removing hexes. And, by removing hexes, SRT values did not change in 85% of cases. 4. There were only 2 cases regarded as acceptable fit by one-screw test, and SRT values of 2$^{nd}$ screws of both cases were grade 2. Conclusion. Within the limitations of this study, future-level impression of internal connection implant system is considered to obtain inaccurate working cast, even using acrylic resin splinted impression technique. And, it is considered to be unable improve the fit to remove the hexes of implant restoration.

Keywords

References

  1. Branemark PI. Osseointegration and its experimental background. J Prosthet Dent 1983;50:399-410 https://doi.org/10.1016/S0022-3913(83)80101-2
  2. Naconecy MM, Teixeira ER, Shinkai RS. Frasca LC, Cervieri A. Evaluation of the accuracy of 3 transfer techniques for implant-supported prostheses with multiple abutments. Int J Oral Maxillofac Implants 2004; 19: 192-198
  3. Assif D. Fenton A, Zarb G, Schmitt A. Comparative accuracy of implant impression procedures. Int J Periodontics Restorative Dent 1992;12:112-121
  4. Assif D, Marshak B, Schmidt A. Accuracy of implant impression techniques. Int J Oral Maxillofac Implants 1996; 11 : 216-222
  5. Vigolo P, Majzoub Z, Cordioli G. Evaluation of the accuracy of three techniques used for multiple implant abutment impressions. J Prosthet Dent 2003;89:186-192 https://doi.org/10.1067/mpr.2003.15
  6. Branemark PI, Zarb G, Albrektsson T. Tissue-integrated prostheses. Osseointegration in clinical dentistry. Chicago: Quintessence, 1985. p.11-12, 253-257
  7. 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 Restor Dent 2002;10:163-166
  8. 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 ;6:270-276
  9. Jemt T. Fixed implant-supported prostheses in the edentulous maxilla. A five-year follow-up report. Clin Oral Implants Res 1994:5: 142-147 https://doi.org/10.1034/j.1600-0501.1994.050304.x
  10. Jemt T, Lie A. Accuracy of implant-supported prostheses in the edentulous jaw: analysis of precision of fit between cast gold-alloy frameworks and master casts by means of a three-dimensional photogrammetric technique. Clin Oral Implants Res 1995;6:172-180 https://doi.org/10.1034/j.1600-0501.1995.060306.x
  11. 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
  12. Choi JH, Kim CW, Jang KS, Lim YJ. Comparative accuracy of the splinted and unsplinted impression methods for internal connection. The Journal of Korean Academy of Prosthodontics 2005; 43: 352-362
  13. Rudd KD, O' Leary TJ, Stumpf AJ, Jr. Horizontal Tooth Mobility In Carefully Screened Subjects. Techn Docum Rep Sam-Tdr-64-12. Tech Doc Rep U S Air Force Syst Command Electron Syst Div 1964;94: 1-6
  14. Sekine H, Komiyama Y, Hotta H, Yoshida K. Mobility characteristics and tactile sensitivity of osseointegrated fixture-supporting systems. In: van Steenberghe D, ed. Tissue integration in oral maxillofacial reconstruction. Amsterdam: Excerpta Medica. 1986. p.326-332
  15. Lundqvist S, Carlsson GE. Maxillary fixed prostheses on osseointegrated dental implants. J Prosthet Dent 1983;50:262-270 https://doi.org/10.1016/0022-3913(83)90028-8
  16. Spector MR, Donovan TE, Nicholls JI. An evaluation of impression techniques for osseointegrated implants. J Prosthet Dent 1990; 63 :444-447 https://doi.org/10.1016/0022-3913(90)90235-5
  17. Fenton A, Assif D, Zarb G, Schmitt A. The accuracy of implant impression procedures. J Dent Res 1991;70:399 (abstr no. 1065)
  18. Assif D, Nissan J, Varsano I, Singer A. Accuracy of implant impression splinted techniques: effect of splinting material. Int J Oral Maxillofac Implants 1999;14:885-888
  19. Nissan J, Gross M, Shifman A, Assif D. Stress levels for well-fitting implant su- perstructures as a function of tightening force levels, tightening sequence. and different operators. J Prosthet Dent 2001; 86:20-23 https://doi.org/10.1067/mpr.2001.115182
  20. Vigolo P. Fonzi F, Majzoub Z, Cordioli G. An evaluation of impression techniques for multiple internal connection implant prostheses. J Prosthet Dent 2004;92:470-476 https://doi.org/10.1016/j.prosdent.2004.08.015
  21. Carr AB. Comparison of impression techniques for a five-implant mandibular model. Int J Oral Maxillofac Implants 1991 ;6:448-455
  22. Carr AB. Comparison of impression techniques for a two-implant 15-degree divergent model. Int J Oral Maxillofac Implants 1992;7:468-475
  23. Henry PJ. An alternative method for the production of accurate casts and occlusal records in osseointegrated implant rehabilitation. J Prosthet Dent 1987; 58: 694-697 https://doi.org/10.1016/0022-3913(87)90421-5
  24. Loos LG. A fixed prosthodontic technique for mandibular osseointegrated titanium implants. J Prosthet Dent 198;:55:232-242 https://doi.org/10.1016/0022-3913(86)90351-3
  25. Hollender L, RockIer B. Radiographic evaluation of osseointegrated implants of the jaws. Experimental study of the influence of radiographic techniques on the measurement of the relation between the implant and bone. Dentomaxillofac Radiol 1980;9:91-95 https://doi.org/10.1259/dmfr.1980.0019
  26. Lewis S. Anterior single-tooth implant restorations. lnt J Periodontics Restorative Dent 1995; 15: 30-41