Journal article

Publication year: 2021

Pages: 4635-4642

Journal: Clinical Oral Investigations

Volume number: 25

Issue number: 7

ISSN: 1432-6981

eISSN: 1436-3771

Open access status: Hybrid

DOI Link: https://doi.org/10.1007/s00784-021-03777-z

Publisher: Springer

Abstract: 

Objectives Due to the partly strongly differing results in the literature, the aim of the present study was to investigate a possible deformation of the mandible during mouth opening using an intraoral scanner (IOS) and a conventional impression for comparison with a reference aid.

Materials and methods Four steel spheres were reversibly luted in the mandibular (n = 50) with a metallic reference aid at maximum mouth opening (MMO). Two digital impressions (Trios3), at MMO and at slightly mouth opening SMO and a conventional impression (Impregum), were taken as the measuring accuracy of the reference structure was already known. Difference between MMO-SMO for digital impressions and deviations between digital and conventional (SMO) were calculated. Furthermore, the angle between the normal vectors of two constructed planes was measured. Statistical analysis was performed with SPSS25.

Results Deviations for linear distances ranged from -1 +/- 3 mu m up to 17 +/- 78 mu m (digital impressions, MMO-SMO), from 19 +/- 16 mu m up to 132 +/- 90 mu m (digital impressions, SMO), and from 28 +/- 17 mu m up to 60 +/- 52 mu m (conventional impressions, SMO). There were no significant differences for digital impressions (MMO-SMO), and there were significant differences between the conventional and digital impressions at SMO.

Conclusions Based on the results of the present study, no mandibular deformation could be detected during mouth opening with regard to the digital impressions. The results were rather within the measuring tolerance of the intraoral scanner.

Harvard Citation style: Schmidt, A., Klussmann, L., Schlenz, M. and Woestmann, B. (2021) Elastic deformation of the mandibular jaw revisited-a clinical comparison between digital and conventional impressions using a reference, Clinical Oral Investigations, 25(7), pp. 4635-4642. https://doi.org/10.1007/s00784-021-03777-z

APA Citation style: Schmidt, A., Klussmann, L., Schlenz, M., & Woestmann, B. (2021). Elastic deformation of the mandibular jaw revisited-a clinical comparison between digital and conventional impressions using a reference. Clinical Oral Investigations. 25(7), 4635-4642. https://doi.org/10.1007/s00784-021-03777-z