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

: To investigate changes in mandibular incisor position resulting from Invisalign correction of the crowded dentition without extraction. Materials and Methods: A retrospective chart review was completed on 61 adult White patients. Patients were categorized into three groups based on the value of pretreatment crowding of the lower dentition: 20 mild (2.0–3.9 mm), 22 moderate (4.0–5.9 mm), and 19 severe (.6.0 mm). Cephalometric radiographs were measured to determine lower incisor changes

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