Hybrid Scan: Predictable Technology for High Precision In-lab Model Scan
Objectives: Model scanning tends to miss crucial areas and certain detail – typically the interproximal regions but also the retracted gingival sulcus around a tooth preparation. To solve this, normally the gypsum model is physically trimmed and sectioned. The objective of this study is to evaluate the precision and the accuracy of the images obtained after processing together the scans of a PVS impression and the subsequent scan of the poured model. Methods: A high definition, new generation lab scanner (AADVA Lab Scanner 2, GC Corp, Japan) with hybrid-scan technology was selected for his evaluation. 20 realistic dental training models were used for this test. In each model, elements 11, 15 and 26 were prepared with similar technique and Chamfer preparation. The following steps were then executed: 1) PVS Impression of the model and direct scan of the impression; 2) Pouring of the impressions and scan of the gypsum models; 3) Scan of the training model and 4) Removal of the prepared teeth and the adjacent integral teeth for individual scan; 5) digital placement of scans obtained at step 4 back in the arch from 3, in order to produce a gold standard; 6) Creation of a hybrid using (1)+(2) and measurement of the deviation from each individual prep and variations. Results: The model scan (2) missed approximal and subgingival areas, while the impression scan (1) often missed inciso-palatal areas. The hybrid scan demonstrated to be able to recreate details and missing parts. The individual mean deviations from the gold standard teeth was <5 microns. Conclusions: The hybrid scan obtained by the tested scanner demonstrated to reproduce more significant and precise details in respect to the ordinary model scan. This method allow a flexible alignment of the impression scan into the missing parts of the model scan, and this ensures high quality resurfacing.
Division:IADR/AADR/CADR General Session
Meeting:2020 IADR/AADR/CADR General Session (Washington, D.C., USA) Location:Washington, D.C., USA
Year: 2020 Final Presentation ID:3418 Abstract Category|Abstract Category(s):Dental Materials 6: Instruments and Equipment
Authors
Basso, Matteo
( University of Milan, Galeazzi Orthopaedic Institute
, Milan
, Italy
)
Dian, Arturo
( University of Milan, Galeazzi Orthopaedic Institute
, Milan
, Italy
)
Pulcini, Maria
( University of Milan, Galeazzi Orthopaedic Institute
, Milan
, Italy
)
Vitelli, Carlo
( University of Milan, Galeazzi Orthopaedic Institute
, Milan
, Italy
)