7th Scientific Congress of the DGAO for Aligner Orthodontics

Karl-Friedrich Krey, Greifswald (Germany)

Karl-Friedrich Krey
  • 1993-1998: Degree in dentistry
  • 1998-1999: Work as a resident physician in private dental practice
  • 1999-2003: Research Assistant University Medicine Leipzig (UML), Department of Orthodontics
  • 2005-2007: Degree "Master of Medical Education" University of Heidelberg
  • 2010: Habilitation (post-doctoral accreditation as a university lecturer) and appointment as Deputy Director of the Department of Orthodontics, UML
  • 2013: Director of the Department of Orthodontics University Medicine Greifswald, Germany (UMG)
  • 2019: Director of the Center for Dental, Oral and Orthodontic Medicine, UMG
  • Specialties: epidemiology and healthcare research, cold atmospheric plasma (CAP), digital orthopedics / 3D printing / aligner technology

Biological reality of computer planned tooth movements with aligners - a multicenter, prospective study

Aim: To detail an empirical model of tooth movement using the aligner technique.

Material and method: According to a standardized protocol, 31 patients were treated with aligners. Following intraoral scanning, the planning of the treatment goal and staging was performed in OnyxCeph 3D Lab. The limit values of the movements were uniform. No attachments were used. All working models were printed with a FDM printer with 150 µm layer thickness and aligners made of 0.6 mm Erkodur (initial) and 0.8 mm material. Superposition of the planning target was performed for each aligner level using GOM Inspect software after intermediate scans.

Results: Between 30% and 90% of the planned tooth movements could be implemented for each aligner step. No clearly significant correlation between the tooth, type of movement and movement achieved could be found.

Conclusions: A complete transfer of the planned tooth movements cannot be expected. The deviations do not follow a systematic pattern.

SATURDAY, March 6th, 2021, 10.30 - 10.40 am