Original ArticlesComparison of impression materials for direct multi-implant impressions☆,☆☆
Section snippets
Material and Methods
This in vitro study compared the torque required to rotate direct square impression copings in 8 impression material groups. Those material groups that produced torque values detectable by a torque-measuring unit were then compared for implant cast accuracy. An implant master model (Anderson Precision Machining, Inc, Iowa City, Iowa) was milled from a solid aluminum block. Five stainless steel abutment replicas (DCA 174, Nobel Biocare USA Inc, Chicago, Ill.) were cemented symmetrically in an
Results
Of the impression materials tested (Table I), torque values were detected for only 3: polyether (medium), addition silicones (high), and polysulfides (medium) (Fig. 7). Impression coping position did not produce a statistically significant difference within material groups’ torque values (P =.1866), and a significant interaction effect was not identified between impression coping position and
Discussion
Methodologic and clinical considerations shed light on the relevance of these findings. The sensitivity of the Compudriver device (Consolidated Device Inc, City of Industry, Calif.) was used arbitrarily as a selection criterion for differentiating between impression material groups to be tested in the accuracy phase of this study. Thereby, impression materials that lacked rigidity to prevent possible rotation of the copings were eliminated from further consideration for viable accuracy. Several
Conclusion
The properties of an impression material, including rigidity and accuracy, can influence the accuracy of the implant impression, the accuracy of the solid implant cast, and ultimately, the accuracy of the cast implant framework. Choosing an impression material for multi-implant–retained prosthesis requires consideration of several factors, including material accuracy, clinician’s experience with material, length of time before the impression is poured, and amount of intraoral undercuts.
Within
Acknowledgements
I would like to thank Drs Steve Rosenstiel and Alan Carr for their encouragement and review of the manuscript. Thanks also go to Dr William Johnston for the statistical assistance and Dr Peter Monaghan for his suggestions regarding the measuring technique.
References (48)
- et al.
Fit of implant framework fabricated by different techniques
J Prosthet Dent
(1997) - et al.
A comparative analysis of the accuracy of implant transfer techniques
J Prosthet Dent
(1993) - et al.
An evaluation of impression techniques for osseointegrated implants
J Prosthet Dent
(1990) - et al.
Prosthetic consideration in reconstructive implantology
Dent Clin North Am
(1986) Alternative prosthodontic technique for tissue-integrated prostheses
J Prosthet Dent
(1987)- et al.
Evaluation of three impression techniques for osseointegrated oral implants
J Prosthet Dent
(1993) - et al.
A comparison of the dimensional accuracy of the splinted and unsplinted impression techniques for Bone-Lock implant system
J Prosthet Dent
(1997) Impression making for osseointegrated dentures
J Prosthet Dent
(1985)Production of accurately fitting full-arch implant frameworks: part I—clinical procedures
J Prosthet Dent
(1991)The measurement of distortion: concluding remarks
J Prosthet Dent
(1980)
The measurement of distortion: theoretical considerations
J Prosthet Dent
Biomechanical considerations in osseointegrated prostheses
J Prosthet Dent
In vivo load measurements on osseointegrated implants supporting fixed or removable prostheses: a comparative pilot study
Int J Oral Maxillofac Implants
Three-dimensional distortion of gold-alloy castings and welded titanium frameworks: measurements of the precision of fit between completed implant prostheses and the master cast in routine edentulous situations
J Oral Rehabil
In vivo measurements of precision of fit involving implant-supported prostheses in the edentulous jaw
Int J Oral Maxillfac Implants
The clinical significance of distortion in implant prosthodontics: is there such a thing as passive fit?
Ann Acad Med Singapore
Strategies to achieve fit in implant prosthodontics: a review of the literature
Int J Prosthodont
Measuring fit at the implant prosthodontic interface
J Prosthet Dent
Fixed implant supported prosthesis with welded titanium frameworks
Int J Periodontics Restorative Dent
Passive fit of implant-retained prosthetic framework improved by electric discharge machining
J Prosthodont
Fabrication of titanium implant-retained restorations with nontraditional machining techniques
Int J Prosthodont
Electrical discharge machining
J Dent Technol
Evaluation of master cast technique for multiple abutment implant prostheses
Int J Oral Maxillofac Implants
Evaluation of the accuracy of solid implant casts
J Prosthodont
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This project was supported in part by funds from The Ohio State University College of Dentistry and presented in part at the 1999 International Association of Dental Research Annual Session as a finalist for the 1999 Arthur R. Frechette Prosthodontic Research Award competition.
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Reprint requests to: Dr Alvin G. Wee, Section of Restorative Dentistry, Prosthodontics and, Endodontics, College of Dentistry, the Ohio State University, 305 W 12th Ave, Columbus, OH 43210-1241, FAX: 614-292-9422, E-MAIL: [email protected]