Accuracy of implant supported overdenture digital impression utilizing scan bodies and different scanning techniques: an in-vitro and in-silico study | ||||
| Egyptian Dental Journal | ||||
| Article 17, Volume 68, Issue 2 - Serial Number 4, April 2022, Page 1675-1684 PDF (1.57 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2022.118309.1966 | ||||
 View on SCiNiTO | ||||
| Author | ||||
Mohamed Ahmed Alkhodary  
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| 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. | ||||
| Keywords | ||||
| intra-oral scan bodies (ISBs); digital impression; intra-oral scanner (IOS); in-silico superimposition; implant supported overdenture | ||||
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