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Updated: Apr 29, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Effect of 2 impression techniques on the dimensional accuracy of working implant prosthesis models: an in vitro study
Gaetano Calesini1, Fernando Zarone, Roberto Sorrentino
1From the *University Federico II, Naples, Italy; †University of Sheffield, Sheffield, UK; ‡University of Brescia, Brescia, Italy; and §San Raffaele University, Milan, Italy.
Purpose:
Implant impressions and working models form integrated precision systems for registration and transmission of clinical data. The components of implant systems have a dimensional tolerance capable of introducing inaccuracies in the impression, thus in the prosthetic framework. This article aimed at comparing 2 repositioning impression techniques: one using impression copings (conventional technique) and the other using the final abutments as impression copings (interceptive technique).
Materials And Methods:
Two experimental models, one with 4 parallel implants and the other with 4 nonparallel implants, were used to make silicone impressions. Twenty impressions were made with the conventional technique, and a further 20 were made with the interceptive technique. Three-dimensional images acquired with a three-dimensional scanner were measured using a three-dimensional image analysis software, comparing models obtained from the impressions with the experimental models. Data were statistically analyzed by means of confidence intervals calculated with the mean (α = 0.05), descriptive (box plot), and bivariate analyses.
Results:
Statistic analysis highlighted significant differences among models obtained using both techniques: the interceptive technique generated working models with less distortion and variability.
Conclusions:
For internal-connection implants, the interceptive technique provided significantly more precise working models than did the conventional technique.
