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Open AccessArticle

A New Proposal: A Digital Flow for the Construction of a Haas-Inspired Rapid Maxillary Expander (HIRME)

1
Istituto Giuseppe Cozzani, 19125 La Spezia, Italy
2
Department of Medical, Surgical and Health Sciences, School of Dentistry, Università di Trieste, 34100 Trieste, Italy
3
Private Lab, 24100 Bergamo, Italy
4
Teor laboratorio specializzato in ortodonzia, 80 47923 Rimini, Italy
5
Dipartimento di Biotecnologie Mediche, Università di Siena, 53100 Siena, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(13), 2898; https://doi.org/10.3390/ma13132898
Received: 3 April 2020 / Revised: 23 April 2020 / Accepted: 22 June 2020 / Published: 28 June 2020
Maxillary expansion is a common orthodontic treatment used for the correction of posterior crossbite resulting from reduced maxillary width. Transverse maxillomandibular discrepancies are a major cause of several malocclusions and may be corrected in different manners; in particular, the rapid maxillary expansion (RME) performed in the early mixed dentition has now become a routine procedure in orthodontic practice. The aim of this study is to propose a procedure that reduces the patient cooperation as well as the lab work required in preparing a customized Haas-inspired rapid maxillary expander (HIRME) that can be anchored to deciduous teeth and can be utilized in mixed dentition with tubes on the molars and hooks and brackets on the canines. This article thus presents an expander that is completely digitally developed, from the first moment of taking the impression with an optical scanner to the final solidification phase by the use of a 3D printer. This digital flow takes place in a CAD environment and it starts with the creation of the appliance on the optical impression; this design is then exported as an stl extension and is sent to the print service to obtain a solid model of the device through a laser sintering process. This “rough” device goes through a post-processing procedure; finally, a commercial expansion screw is laser-welded. This expander has all the advantages of a cast-metal Haas-type RME that rests on deciduous teeth; moreover, it has the characteristic of being developed with a completely digitized and individualized process, for the mouth of the young patient, as well as being made completely of cobalt-chrome, thus ensuring greater adaptability and stability in the patient’s mouth. View Full-Text
Keywords: Haas-inspired rapid maxillary expander (HIRME); mixed dentition; rapid palatal expansion; digital flow; optical impression; stl file; 3D printer Haas-inspired rapid maxillary expander (HIRME); mixed dentition; rapid palatal expansion; digital flow; optical impression; stl file; 3D printer
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MDPI and ACS Style

Cozzani, M.; Antonini, S.; Lupini, D.; Decesari, D.; Anelli, F.; Doldo, T. A New Proposal: A Digital Flow for the Construction of a Haas-Inspired Rapid Maxillary Expander (HIRME). Materials 2020, 13, 2898.

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