Abstract
BackgroundThe aim of the study was to compare the amount of interproximal enamel reduction (IPR) provided on ClinCheck software with the amount of IPR carried out by the orthodontist during treatment with clear aligners.Methods30 subjects (14 males, 16 females; mean age of 24.53 ± 13.41 years) randomly recruited from the Invisalign account of the Department of Orthodontics at the University of Rome “Tor Vergata” from November 2018 to October 2019, were collected according to the following inclusion criteria: mild to moderate dento-alveolar discrepancy (1.5–6.5 mm); Class I canine and molar relationship; full permanent dentition (excluding third molars); both arches treated only using Comprehensive Package by Invisalign system; treatment plan including IPR. Pre- (T0) and post-treatment (T1) digital models (.stl files), created from an iTero scan, were collected from all selected patients. The OrthoCAD digital software was used to measure tooth mesiodistal width in upper and lower arches before (T0) and at the end of treatment (T1) before any refinement. The widest mesio-distal diameter was measured for each tooth excluding molars by “Diagnostic” OrthoCAD tool. The total amount of IPR performed during treatment was obtained comparing the sum of mesio-distal widths of all measured teeth at T0 and T1. Significant T1–T0 differences were tested with dependent sample t-test (P < 0.05).ResultsIn the upper arch, IPR was digitally planned on average for 0.62 mm while in the lower arch was on average for 1.92 mm. As for the amount of enamel actually removed after IPR performing, it was on average 0.62 mm in the maxillary arch. In the mandibular arch, the mean of IPR carried out was 1.93 mm. The difference between planned IPR and performed IPR is described: this difference was on average 0.00 mm in the upper arch and 0.01 in the lower arch.ConclusionsThe amount of enamel removed in vivo corresponded with the amount of IPR planned by the Orthodontist using ClinCheck software.
Highlights
The aim of the study was to compare the amount of interproximal enamel reduction (IPR) provided on ClinCheck software with the amount of IPR carried out by the orthodontist during treatment with clear aligners
In Invisalign treatment IPR is pre-planned during ClinCheck development: the clinician can decide the amount of IPR to be performed and the area and stage where it is needed [5]
47 arches were collected for this investigation: in 17 patients interproximal enamel reduction was digitally planned and performed in both arches, in 2
Summary
The aim of the study was to compare the amount of interproximal enamel reduction (IPR) provided on ClinCheck software with the amount of IPR carried out by the orthodontist during treatment with clear aligners. The main target of an orthodontic treatment is to provide the best balance among occlusal relationships, dental and facial esthetics and long-term treatment stability Achieving these goals could be difficult in most patients because of the excess of tooth structures that often can interfere with the correct alignment of the teeth in the dental arch [4]. It is a clinical procedure that allows to gain space in order to align teeth through the reduction, the anatomic recontouring and the protection of interproximal enamel surfaces of permanent teeth [5] This technique may help achievement of treatment goals while preserving the integrity of the dental and periodontal tissues [6]. The amount of IPR done has to be as the expected and programmed one in order to obtain the planned movements [11]
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