Deviation Analysis of Digital Model of Edentulous Jaw with Two Impression Methods

doi:10.13701/j.cnki.kqyxyj.2022.03.012

Abstract

Abstract: Objective: To explore the mucosal changes of maxillary edentulous jaw by using digital scanning technology and reverse engineering software, and to compare the differences of edentulous jaw models under different mold taking methods. Methods: Twenty patients with edentulous maxillary were randomly selected. The maxillary impression was obtained by two different methods. The traditional anatomical impression was obtained by using a perforated tray and alginate material, and the pressure impression was obtained by using a nonporous tray and silica material. Then, all impressions were scanned with an extraoral scanner (D810, 3shape) and converted into a digital model. A pair of models of the same patient was registered using the "best matching method". Results: The best fitting alignment method showed that there was significant difference in mucosal deviation between edentulous anatomical model and pressure model. The area with the smallest deviation was located in the alveolar ridge area, and the area with the largest deviation was the postdam area. Conclusion: The mucosal deformation of pressure impression was significantly higher than anatomical impression. There are differences in the deformation of the whole model, maxillary hard area, and postdam area.

Key words: edentulous jaw, impression, deviation, functional area, best fit

YU Nian, CAO Yang, YU Qing. Deviation Analysis of Digital Model of Edentulous Jaw with Two Impression Methods[J]. Journal of Oral Science Research, 2022, 38(3): 252-255.

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