Dr. Simon Graf

Short CV

Smile AG Belp, Switzerland Born 15.10.1980 Academic studies:
Dentist, University of Bern 17.10.2007 Postgraduate program, orthodontic
department of the University of Basel  August 2009 - September 2012

Opening Smile AG, private orthodontic clinic in Belp, Switzerland February 2014
www.smile-ag.ch  info@smile-ag.ch
+41 31 812 11 10 Private number +41 78 626 88 97




Title: CAD/CAM procedures for orthodontics: A new digital approach for metallic orthodontic appliances

Aim; The aim is to provide a digital procedure for metallic orthodontic appliances.
So far there were, since the introduction of intraoral scanners, only possibilities for space-analysis or digital setup. If there was the need for something further, everybody still either made alginate impressions, or printed the models.
As there are CAD/CAM solutions for ceramics available (e.g. Cerec Sirona), there should also be a possibility for metallic appliances.

Materials and methods: First the Trios scanner from 3Shape was used to generate the 3D data of the patient.
CAD/CAM software was used to design different orthodontic appliances, starting with the classic hyrax (rapid palatal expansion).
A expansion screw from Forestadent 12mm was digitized and incorporated in the design.
The metal used, was Remanium Star® by Dentaurum, a CO-CR-alloy in powder, so it could be used in the laser-melting process.
Bonding procedure with Scotchbond Universal and Transbond XT as known for conventional bonding of metallic orthodontic appliances.

Results: 20 out of 25 hyrax showed a success rate of 100% with a cemental gap of 0.05mm and with the described bonding procedure. Changes of the width of the cemental gap and bonding procedure led to failure in the 5 other hyrax.

Discussion: As a new private clinic, the number of patients is not big enough for a significant value.
Other appliances (lingual arch, trans palatal arch, hybrid-hyrax with mini-pin, hybrid-hyrax-distalizer with mini-pin) were inserted meanwhile with this procedure (cemental gap width and bonding) and showed a reliable success rate.

Conclusion: This procedure seems to be a reliable possibility to transfer the conventional metallic appliances in the digital century.
Nevertheless, more data with different designs and appliances would be helpful to ensure this new procedure.