custom impression tray for dental implants
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Custom impression tray for dental implants
Omid Savabi, DDS, MS,a and Farahnaz Nejatidanesh, DDS, MSb
School of Dentistry, Esfahan University of Medical Sciences, Esfahan, Iran
An accurate impression is mandatory for achieving aprecise, definitive fixed implant-supported prosthesis.1-8
An inaccurate impression may result in the need for addi-tional clinical time or remaking the impression.1,7-10
A commonly used implant impression technique is theuse of an open custom impression tray.5-7 The dentaltechnician may receive an irreversible hydrocolloid im-pression for making a custom tray that does not showthe implant axis and position. This could require theclinician to further modify the custom tray chairside.A method for fabrication of a custom impression trayfor the ITI dental implant system (ITI Dental ImplantSystem; Straumann AG, Waldenburg, Switzerland) isdescribed in this article. In this method, the implantaxis and opening and space for impression copings areincorporated in the custom tray. This technique couldalso be used with other implant systems.
PROCEDURE
1. Remove the cover screws (048.371, ITI DentalImplant System; Straumann AG) from the implantsand insert the guide screw of the impression copings(048.090, synOcta ITI Dental Implant System;Straumann AG) with the appropriate screwdriver(046.401, ITI Dental Implant System; StraumannAG).
2. Make an impression with irreversible hydrocolloid(Alginoplast; Heraeus Kulzer, Hanau, Germany).
3. Place straight handpiece round burs (TeledyneDensco, Denver, Colo) in the depressions of guidescrews in the impression and pour the impression withtype III dental stone (Moldano; Heraeus Kulzer);thus, the noncutting end of the round burs on thediagnostic cast demonstrates the axis of guide screwsintraorally (Fig. 1, A).
4. Place appropriate impression copings (048.090,synOcta ITI Dental Implant System; StraumannAG) upside down over the round burs on the diag-nostic cast (Fig. 1, B).
5. Cover the diagnostic cast with a proper thicknessof baseplate wax (Modelling wax; Dentsply, Wey-bridge, UK) and cover the wax with tin foil to preventwax impregnation on the acrylic resin custom tray.
aAssociate Professor, Department of Prosthodontics and TorabinejadDental Research Center.
bAssociate Professor, Department of Prosthodontics and TorabinejadDental Research Center.
J Prosthet Dent 2007;97:183-4.
MARCH 2007
Fig. 1. A, Noncutting end of round burs demonstrates axis ofguide screws. B, Impression copings placed upside downover round burs.
Fig. 2. Custom impression tray.
THE JOURNAL OF PROSTHETIC DENTISTRY 183
THE JOURNAL OF PROSTHETIC DENTISTRY SAVABI AND NEJATIDANESH
6. Make the custom impression tray with light-polymerizing resin (Megatray; Megadenta, Radeberg,Germany) (Fig. 2).
REFERENCES
1. Wise M. Fit of implant-supported fixed prostheses fabricated on master casts
made from a dental stone and a dental plaster. J Prosthet Dent 2001;86:532-8.
2. Ortorp A, Jemt T, Back T. Photogrammetry and conventional impressions
for recording implant positions: a comparative laboratory study. Clin
Implant Dent Relat Res 2005;7:43-50.
3. 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;10:163-6.
4. Daoudi MF, Setchell DJ, Searson LJ. A laboratory investigation of the
accuracy of two impression techniques for single-tooth implants. Int
J Prosthodont 2001;14:152-8.
5. Burns J, Palmer R, Howe L, Wilson R. Accuracy of open tray implant
impressions: an in vitro comparison of stock versus custom trays. J Pros-
thet Dent 2003;89:250-5.
6. Akca K, Cehreli MC. Accuracy of 2 impression techniques for ITI
implants. Int J Oral Maxillofac Implants 2004;19:517-23.
7. Thongthammachat S, Moore BK, Barco MT 2nd, Hovijitra S, Brown DT, An-
dres CJ. Dimensional accuracy of dental casts: influence of tray material,
impression material, and time. J Prosthodont 2002;11:98-108.
184
8. Assuncao WG, Filho HG, Zaniquelli O. Evaluation of transfer impressions
for osseointegrated implants at various angulations. Implant Dent 2004;
13:358-66.
9. Vigolo P, Majzoub Z, Cordioli G. Evaluation of the accuracy of three tech-
niques used for multiple implant abutment impressions. J Prosthet Dent
2003;89:186-92.
10. Vigolo P, Fonzi F, Majzoub Z, Cordioli G. An evaluation of impression
techniques for multiple internal connection implant prostheses. J Prosthet
Dent 2004;92:470-6.
Reprint requests to:
DR OMID SAVABI
# 400-SHEIKHSADOOGH SHOMALI ST.
SHEIKHSADOOGH CROSS RD
ESFAHAN, IRAN
FAX: 009-8311-6625500
E-MAIL: savabi@hotmail.com
0022-3913/$32.00
Copyright � 2007 by The Editorial Council of The Journal of Prosthetic
Dentistry.
doi:10.1016/j.prosdent.2006.12.009
VOLUME 97 NUMBER 3
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