Accuracy of implant supported overdenture digital impression utilizing scan bodies and different scanning techniques: an in-vitro and in-silico study

Document Type : Original Article

Author

Associate professor, department of prosthodontics, faculty of dentistry, Alexandria university, Egypt.

Abstract

Introduction: The accuracy of different scanning techniques and intra-oral scan bodies (ISBs) in allocating the position of dental implants in complete overdenture digital impression has been questioned, this work compared it to conventional impression in situation where 4 parallel implants were used to simulate implant-supported overdenture situations in an in-vitro setting.
Materials and methods: A conventional and digital impressions using ISBs and 5 different scanning techniques were made of a study model having 4 parallel implants at teeth sites 36, 33, 43, and 46 which were designated as A, B, C, and D respectively. The resulting stone cast and digital impressions virtual casts were compared for linear deviations between the implant sites using a digital caliper versus computerized measurements, and for surface mismatching using a computerized superimposition process of the stone model scan and virtual models. The linear deviations measurements were statistically analyzed using the paired t test, and the horizontal deviations were statistically analyzed using the Kruskal Wallis test.
Results: Comparison of the linear measurements on the stone cast and virtual models detected significant differences in the second and third sextants of the dental arch with techniques I and IV, while superimposition horizontal deviations detected significant differences at implant positions C and D also in techniques I and IV.
Conclusions: Virtual models generated from full arch digital impressions using scan bodies and scanning techniques II, III, and V had similar accuracy to stone models developed from conventional elastomeric impressions.

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Egyptian Dental Journal
Volume 68, Issue 2 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
April 2022
Pages 1675-1684

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