Changes in mandibular incisor position and arch form resulting from Invisalign correction of the crowded dentition treated nonextraction

Abstract

Invisalign(®) treatment can successfully resolve mandibular arch crowding using a combination of buccal arch expansion, interproximal reduction, and lower incisor proclination. When there is <6 mm of crowding, lower incisor position remained relatively stable. The lower incisors proclined and protruded in the more severely crowded dentitions (>6 mm).

Clinical effectiveness of Invisalign® orthodontic treatment: a systematic review

“… Maxillary molar distalization with aligners in adult patients: a multicenter retrospective study Invisalign group Dentoalveolar and skeletal changes following maxillary molar distalization therapy with Invisalign in adult patients Pre- and post-treatment lateral cephalometric radiographs - Distal movement of the 1st molar: 2.25 mm without significant tipping and vertical movements - Distal movement of the 2nd molar: 2.52 mm without significant tipping ( P = 0.056) and vertical movements - No significant movements on the lower arch. - SN-GoGn and SPP-GoGn angles showed no significant differences between pre- and post-treatment cephalograms - Invisalign aligners are effective in distalizing Mx molars in selected end-to-end class II non-growing subjects without significant vertical and mesiodistal tipping movements - No changes to the facial height Duncan et al [ 32 ] (2015) Retrosp. Changes in mandibular incisor position and arch form resulting from Invisalign correction of the crowded dentition treated nonextraction Invisalign groups Treatment outcomes in non-extraction cases with lower anterior crowding treated with Invisalign® -Pre- and post-treatment records (digital study models and lateral cephalometric radiographs) -Cephalometric analysis to determine lower incisor changes - IPR and changes in arch width were also measured - In the severe crowding group, there were statistically significant changes in lower incisor position and angulation - No significant differences in lower incisor position and angulation in the the mild and moderate crowding groups - Statistically significant increase in buccal expansion in all three groups.…”

“…Seven studies [ 18 , 19 , 23 , 28 , 33 , 37 , 38 ] compared treatment outcome of Invisalign® orthodontic treatment with that of conventional fixed appliances. At last, four studies [ 20 , 25 , 29 , 32 ] compared Invisalign® groups to each other, while one study [ 31 ] did not have any control or comparison group.…”

“…On the other hand, a second study [ 31 ] reported the ability of Invisalign to bodily distalize maxillary molars in adult nonextraction mild class II cases (≤ ½ cusp), with no changes in facial height. Finally, a third study [ 32 ] showed the ability of Invisalign to correct mild to moderate crowding nonextraction cases without causing significant changes in the mandibular incisor position and inclination. On the contrary, such changes (protrusion and proclination) were induced in cases with severe crowding (≥ 6 mm).…”

Determination of individual teleroentgenographic characteristics of the lower medial incisors position in Ukrainian young men and young women with orthognathic bite

“…Determination of the position of the lower incisors in the sagittal plane is one of the key positions in the diagnosis, planning and control of treatment of dental ankles [9,25]. First of all, because together with the upper incisors, in addition to the function of biting, they also play an aesthetic function.…”

Correction of a Severely Rotated Mandibular Canine in an Adult Patient Using Invisalign: A Case Report

“…The patients that used this system have worn the aligners approximately 22 hours per day except for meals, drinks and dental hygiene [6]. Each aligner is ideally worn for 15 days, moving the teeth at a maximum rate of 0.33 mm and 2 degrees of rotation per aligner [7].…”