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CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0045-1809980
Original Article

Evaluation of the Accuracy of Working Casts Fabricated by Four Implant Impression Techniques in Parallel and Nonparallel Implant Configurations

Ahmad Al Jaghsi 
1   Clinical Sciences Department, College of Dentistry, Ajman University, Ajman, United Arab Emirates
2   Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates
3   Department of Removable Prosthodontics, Damascus University, Damascus, Syria
4   Department of Prosthodontics, Gerodontology and Dental Materials, Greifswald University Medicine, Greifswald, Germany
,
Dinesh Rokaya 
1   Clinical Sciences Department, College of Dentistry, Ajman University, Ajman, United Arab Emirates
2   Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates
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Abstract

Objective

The implant impression technique plays a critical role in determining the accuracy of implant working casts. This laboratory study aimed to evaluate and compare the accuracy of working casts fabricated using four different impression techniques in both parallel and nonparallel implant configurations.

Materials and Methods

An aluminum master model was made to simulate a mandibular dental arch. Impressions of the dental implants were made using four techniques within an incubator: (A) unsplinted tapered impression copings; (B) unsplinted squared impression copings; (C) splinted squared impression copings with dental floss supported with self-curing acrylic resin; and (D) splinted squared impression copings with prefabricated self-curing acrylic resin bars. Measurements were made using a universal measuring microscope in the x- and y-dimensions. The mean deviation index was calculated and compared. Statistical analysis was done using SPSS version 23. Comparisons of the distance deviation index in various groups were conducted using one-way analysis of variance. Furthermore, comparisons of the distance deviation index in nonparallel implants in various techniques were performed using the independent t-test. A p-value of 0.05 was considered a significant difference.

Results

For the parallel implants, the distance deviation index difference between the techniques was not significant. In the case of nonparallel implants, there was statistically significant difference only between the technique C versus technique D (p =  0.019). All the impression techniques showed statistically significant differences between parallel versus nonparallel implant placement in favor of the parallel. Overall, technique D demonstrated the best results for both parallel and nonparallel implant placements when compared with other techniques under the same conditions.

Conclusion

The impression technique affects the accuracy of the implant impression. Within the limitations of this study, impression transfer copings splinted with dental floss and reinforced with self-cure acrylic resin are not recommended, particularly when the implants are not parallel. In the case of parallel implants, there appears to be no statistically significant benefit from splinting transfer impression copings.

Keywords

dental implants - implant impressions - parallel implants - nonparallel implants

Data Availability Statement

The data sets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.


Authors' Contributions

A.A.J. designed the study, participated in methodology, data analysis, and wrote the initial draft. D.R. helped in designing the study, methodology, interpreted the data, and critically revised the original. All authors approved the final manuscript.




Publikationsverlauf

Artikel online veröffentlicht:
08. September 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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