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VOLUME 19 , ISSUE 8 ( 2018 ) > List of Articles


Comparative Study of Dimensional Accuracy in Three Dental Implant Impression Techniques: Open Tray, Closed Tray with Impression Coping, and Snap Cap

Alireza Izadi, Bijan Heidari, Ghodratollah Roshanaei, Hanif Allahbakhshi, Farnoush Fotovat

Keywords : Dental implants, Dental materials, Dental prosthesis, Dimensional accuracy, Impression techniques.

Citation Information : Izadi A, Heidari B, Roshanaei G, Allahbakhshi H, Fotovat F. Comparative Study of Dimensional Accuracy in Three Dental Implant Impression Techniques: Open Tray, Closed Tray with Impression Coping, and Snap Cap. J Contemp Dent Pract 2018; 19 (8):974-981.

DOI: 10.5005/jp-journals-10024-2368

License: CC BY-NC 3.0

Published Online: 01-08-2018

Copyright Statement:  Copyright © 2018; The Author(s).


Aim: Several impression techniques have been proposed to result passive fitness between the prosthesis and osseointegrated implant. The aim of the study was to compare dimensional accuracy of three impression methods: Open tray, closed tray with impression coping, and closed tray with snap cap. Materials and methods: In this experimental study, a mandibular acrylic model was prepared with a milling machine to place three holes for dental implant analogs (Dio SM) with the dimension of 3.8 × 10 mm into the intended sites (one in midline and two others on the side at a distance of 10 mm) parallel with each other and perpendicular to the plane. Twenty-seven casts were prepared with impression material of polyvinyl siloxane (PVS) and dental stone type IV and divided into three groups. Implant situations were measured by coordinate measuring machine (CMM) and results were analyzed with Kruskal–Wallis and Mann–Whitney test to perform pairwise comparison among the groups. Results: The mean ΔR values for open tray, closed tray with impression coping, and closed tray with snap cap were respectively, 0.070 ± 0.088, 0.173 ± 0.205, and 0.142 ± 0.044. There were statistically significant differences between open tray and closed tray as well as open tray and snap cap methods (p < 0.05), but there was no statistically significant difference between closed tray and snap cap method (p = 0.1). Conclusion: Regarding the results, open tray impression technique had the highest dimensional accuracy compared with the other two methods. There were no statically significant differences between closed tray with snap cap and closed tray with impression coping technique. Clinical significance: Snap cap technique is less time consuming with similar dimensional accuracy in comparison with open tray impression technique.

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  1. 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 Jan;77(1):68-75.
  2. Zarb GA, Schmitt A. The longitudinal clinical effectiveness of osseointegrated implants: the Toronto study. Part III: problems and complications encountered. J Prosthet Dent 1990 Aug;64(2):185-194.
  3. Skalak R. Biomechanical considerations in osseointegrated prostheses. J Prosthet Dent 1983 Jun;49(6):843-848.
  4. Brunski JB. Biomechanics of oral implants: future research directions. J Dent Educ 1988 Dec;52(12):775-787.
  5. Patil R, Kadam P, Oswal C, Patil S, Jajoo S, Gachake A. A comparative analysis of the accuracy of implant master casts fabricated from two different transfer impression techniques. J Int Soc Prev Community Dent 2016 Mar-Apr;6(2): 142-148.
  6. Alikhasi M, Siadat H, Monzavi A, Momen-Heravi F. Threedimensional accuracy of implant and abutment level impression techniques: effect on marginal discrepancy. J Oral Implantol 2011 Dec;37(6):649-657.
  7. Misch, CE. Dental implant prosthetics. 2nd ed. St. Louis (MO): Mosby Inc.; 2015. pp. 1-17.
  8. Kim JH, Kim KR, Kim S. Critical appraisal of implant impression accuracies: a systematic review. J Prosthet Dent 2015 Aug;114(2):185-192.
  9. Prithviraj DR, Pujari ML, Garg P, Shruthi DP. Accuracy of the implant impression obtained from different impression materials and techniques: review. J Clin Exp Dent 2011;3(2):e106-e111.
  10. Lin WS, Harris BT, Morton D. The use of a scannable impression coping and digital impression technique to fabricate a customized anatomic abutment and zirconia restoration in the esthetic zone. J Prosthet Dent 2013 Mar;109(3):187-191.
  11. Carr AB. Comparison of impression techniques for a fiveimplant mandibular model. Int J Oral Maxillofac Implants 1991 Dec;6(4):448-455.
  12. Nakhaei M, Madani AS, Moraditalab A, Haghi HR. Threedimensional accuracy of different impression techniques for dental implants. Dent Res J (Isfahan) 2015 Sep-Oct;12(5): 431-437.
  13. Tsagkalidis G, Tortopidis D, Mpikos P, Kaisarlis G, Koidis P. Accuracy of 3 different impression techniques for internal connection angulated implants. J Prosthet Dent 2015 Oct;114(4):517-523.
  14. Balamurugan T, Manimaran P. Evaluation of accuracy of direct transfer snapon impression coping closed tray impression technique and direct transfer open tray impression technique: an in vitro study. J Indian Prosthod Soc 2013 Sep;13(3):226-232.
  15. Lorenzoni M, Pertl C, Penkner K, Polansky R, Sedaj B, Wegscheider WA. Comparison of the transfer precision of three different impression materials in combination with transfer caps for the Frialit®-2 system. J Oral Rehabil 2000 Jul;27(7):629-638.
  16. Vigolo P, Majzoub Z, Cordioli G. Evaluation of the accuracy of three techniques used for multiple implant abutment impressions. J Prosthet Dent 2003 Feb;89(2):186-192.
  17. Kim S, Nicholls JI, Han CH, Lee KW. Displacement of implant components from impressions to definitive casts. Int J Oral Maxillofac Implants 2006 Sep-Oct;21(5):747-755.
  18. Brosky ME, Major RJ, DeLong R, Hodges JS. Evaluation of dental arch reproduction using three-dimensional optical digitization. J Prosthet Dent 2003 Nov;90(5):434-440.
  19. Vigolo P, Majzoub Z, Cordioli G. In vitro comparison of master cast accuracy for single-tooth implant replacement. J Prosthet Dent 2000 May;83(5):562-566.
  20. Inturregui JA, Aquilino SA, Ryther JS, Lund PS. Evaluation of three impression techniques for osseointegrated oral implants. J Prosthet Dent 1993 May;69(5):503-509.
  21. Vojdani M, Torabi K, Ansarifard E. Accuracy of different impression materials in parallel and nonparallel implants. Dent Res J 2015 Jul-Aug;12(4):315-322.
  22. Mahshid M, Eftekhar Ashtiyani R. Investigating the effect of impression techniques on dimensional accuracy of the final casting of implants. J Dent Sch Shahid Beheshti Univ Med Sci 2005;23(4):670-682.
  23. Seyyedan, K.; Javan, M. Investigating the accuracy of implant position transfer in both open and closed tray impression techniques by polyether and polyvinyl siloxane. PhD thesis in the field of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran. 2007-2008.
  24. Baig MR. Multi-unit implant impression accuracy: a review of the literature. Quintessence Int 2014 Jan;45(1):39-51.
  25. Papaspyridakos P, Chen CJ, Gallucci GO, Doukoudakis A, Weber HP, Chronopoulos V. Accuracy of implant impressions for partially and completely edentulous patients: a systematic review. Int J Oral Maxillofac Implants 2014 Jul-Aug;29(4):836-845.
  26. Bambini F, Ginnetti L, Meme L, Pellecchia M, Selvaggio R. Comparative analysis of direct and indirect implant impression techniques an in vitro study. An in vitro study. Minerva Stomatol 2005 Jun;54(6):395-402.
  27. Daoudi MF, Setchell DJ, Searson LJ. An evaluation of three implant level impression techniques for single tooth implant. Eur J Prosthod Restor Dent 2004 Mar;12(1):9-14.
  28. Daoudi M, Setchell DJ, Searson LJ. A laboratory investigation of the accuracy of two impression techniques for single-tooth implants. Int J Prosthod 2001 Mar-Apr;14(2):152-158.
  29. Spector MR, Donovan TE, Nicholls JI. An evaluation of impression techniques for osseointegrated implants. J Prosthet Dent 1990 Apr;63(4):444-447.
  30. Stimmelmayr M, Güth JF, Erdelt K, Happe A, Schlee M, Beuer F. Clinical study evaluating the discrepancy of two different impression techniques of four implants in an edentulous jaw. Clin Oral Investig 2013 Nov;17(8):1929-1935.
  31. Lee H, So JS, Hochstedler JL, Ercoli C. The accuracy of implant impressions: a systematic review. J Prosthet Dent 2008 Oct;100(4):285-291.
  32. Siadat H, Alikhasi M, Beyabanaki E, Rahimian S. Comparison of different impression techniques when using the allon- four implant treatment protocol. Int J Prosthod 2016 May-Jun;29(3):265-270.
  33. Balouch F, Jalalian E, Nikkheslat M, Ghavamian R, Toopchi S, Jallalian F, Jalalian S. Comparison of dimensional accuracy between open-tray and closed-tray implant impression technique in 15 angled implants. J Dent (Shiraz) 2013 Sep; 14(3):96-102.
  34. Kempler, J. The effect of impression technique, connection type and implant angulation on impression accuracy. Doctoral dissertation, University of Maryland, Baltimore. 2011.
  35. Walker MP, Ries D, Borello B. Implant cast accuracy as a function of impression techniques and impression material viscosity. Int J Oral Maxillofac Implants 2008 Jul-Aug;23(4): 669-674.
  36. Ebadian B, Rismanchian M, Dastgheib B, Bajoghli F. Effect of different impression materials and techniques on the dimensional accuracy of implant definitive casts. Dent Res J (Isfahan) 2015 Mar-Apr;12(2):136-143.
  37. Mpikos P, Tortopidis D, Galanis C, Kaisarlis G, Koidis P. The effect of impression technique and implant angulation on the impression accuracy of external-and internal-connection implants. Int J Oral Maxillofac Implants 2012 Nov-Dec;27(6):1422-1428.
  38. Conrad HJ, Pesun IJ, DeLong R, Hodges JS. Accuracy of two impression techniques with angulated implants. J Prosthet Dent 2007 Jun;97(6):349-356.
  39. Herbst D, Nel JC, Driessen CH, Becker PJ. Evaluation of impression accuracy for osseointegrated implant supported superstructures. J Prosthet Dent 2000 May;83(5):555-561.
  40. Carr AB. Comparison of impression techniques for a twoimplant 15-degree divergent model. Int J Oral Maxillofac Implants 1992 Winter;7(4):468-475.
  41. Akça K, Çehreli MC. Accuracy of 2 impression techniques for ITI implants. Int J Oral Maxillofac Implants 2004 Jul-Aug; 19(4):517-523.
  42. Çehreli MC, Akça K. Impression techniques and misfitinduced strains on implant-supported superstructures: an in vitro study. Int J Periodontics Restorative Dent 2006 Aug;26(4):379-385.
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