Effect of 2 impression techniques on the dimensional accuracy of working implant prosthesis models: An in vitro study

Gaetano Calesini, Fernando Zarone, Roberto Sorrentino, Costanza Micarelli, Andrea Fabianelli, Federica Papacchini, Enrico Gherlone

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)822-827
Number of pages6
JournalJournal of Craniofacial Surgery
Issue number3
Publication statusPublished - 2014


  • Implant prosthesis
  • Impression technique
  • Interceptive impression
  • Internal connection
  • Precision

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Surgery


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