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Open Dent J. 2018 Jan 31;12:104-117. doi: 10.2174/1874210601812010104. eCollection 2018.

Digital Dynamic 3D Monitoring of Lower Incisors Intrusion in Lingual Orthodontics.

Author information

1
Department of Surgical and Morphological Sciences, University of Insubria, Varese, Italy.
2
Department of Biomedical Sciences, Dentistry and Morphological and Functional Imaging, University of Messina, Messina, Italy.
3
Department of Biotechnological, Biomedical and Translational Sciences, Section of Orthodontics, University of Parma, Parma, Italy.
4
Department of Medicine and Surgery, University of Insubria, Varese, Italy.
5
Department of Biotechnology and Life Sciences, University of Insubria, Varese, Italy.

Abstract

Objective:

The aim of the present study is to propose a 3-dimensional evaluation of lower intrusion obtained with lingual orthodontics considering not only the crowns but also dental roots.

Methods:

9 adult patients underwent fixed lingual orthodontic treatment with i-TTя lingual brackets system for the correction of crowding in the lower arch associated with a deep overbite. Initial records, consisting of photos, CBCTs and intraoral scans were collected. Threshold segmentation of the CBCT was performed to generate a three-dimensional virtual model of each the teeth of the lower arch, superimposed with the crown of the same teeth obtained by intraoral scan models to generate a complete set of digital composite lower arch The same procedure was performed to monitor one key step of the i-TTЯ technique consisting in lower incisors intrusion (T2). T1-T2 three-dimensional superimposition and color displacement maps were generated to measure and evaluate the movements obtained at the lower arch.

Results:

The root displacement of the incisors during their intrusion in the early stage was totally "bone-safe" in the 88.9% (8 of 9) of the cases observed. No significant extrusion of the premolars used as anchorage unit was measured.

Conclusion:

This method has proved to be an accurate and reliable approach to dynamically visualize the 3-dimensional positions of the teeth, including their roots, with no additional radiation for in-progress treatment monitoring. The 3-dimensional evaluation showed that the employed lingual appliance allowed to obtain significant lower incisors intrusion with negligible undesired extrusion of premolars employed as anchorage teeth.

KEYWORDS:

3D imaging; Anterior crowding; Deepbite; Digital setup; Lingual orthodontics; Lower intrusion; Root position

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