Browsing by Author "Kazim, Sohil"

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A study of dimensional accuracy in a partially edentulous arch by using a new alternate method to scan: An in-vitro study.
(Rutgers School of Dental Medicine, 2023) Kazim, Sohil; Kamel, Mohamed; Saghiri, Mohamed Ali; Morgano, Steven; Morgano, Steven
Objective: This study aims to determine the dimensional accuracy of 3D virtual casts generated by using 2D imaging (3DV) compared with a 3D scanned cast made with a table-top scanner (3DS) of a partially edentulous mandibular stone cast. The 3D scanned cast (3DS) was selected as a control because of its high precision and accuracy. Material and methods: A partially edentulous mandibular stone cast was scanned 5 times by using a 3D table-top scanner (Shining3D Dental, Zhejiang, China) to generate STL files. After a critical examination of all 5 STL 3D scans, 1 of them was chosen for the study with optimal landmarks and no surface defects. One hundred images of the mandibular stone cast were made by using a smartphone (iPhone 12 plus, Apple Inc, Cupertino, CA) from various angles. Then, the 2D images were converted to a 3D model by using the process of photogrammetry. The software used to render this process was Autodesk ReCap software (Autodesk ReCap, Inc, San Rafael, CA). The entire procedure was repeated 12 times to obtain 12 different data sets. To ensure repeatability of this alternate method to scan, all 3DV group casts were superimposed on each other to observe the difference between the superimposed casts. The selected 3D scanned cast from the 3DS group was compared with the 3DV group by using Autodesk Recap software to observe the match between the 2 groups. After completing the Autodesk Recap procedure, ImageJ software (National Institutes of Health, Bethesda, MD) was used to analyze and measure the dimensional difference between the selected 3DS cast and 3DV group. The data were analyzed by using the 1-sample t-test. Results: Twelve virtual casts of the 3DV group were overlapped on the selected 3D scanned cast which was obtained by using the table-top scanner. Significant overlaps were observed between both methods to scan for the partially edentulous mandibular stone cast (P < 0.05, CI 95%). Conclusion: The proposed method was highly accurate and comparable to a commercially available 3D table-top scanner. Clinical relevance: This new scanning technique is highly accurate and less expensive, easier to use and handle, and less space-consuming in the laboratory when compared with the results obtained from a 3D table-top scanner. Statement of problem: - High price of a 3D table-top scanner. - Size of the 3D table-top scanner.
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