Treatment of open bite malocclusion with high angle using invisalign

Abstract

Objective To investigate the clinical application of invisalign in the treatment of open bite malocclusion with high angle and evaluate its effect. Methods Thirty open bite patients with high angle were enrolled in the study using invisalign with extraction treatment, including 12 male and 18 female. The age ranged from 18 to 30 years, with an average age of 24.5 years. Cephalograms of pretreatment and posttreatment were measured. The data were analyzed by SPSS 17.0. Results The overbite of all the patients were back to normal and their lateral profile improved significantly after treatment. SNA decreased by 1.6° (P<0.001) , SNB decreased by 0.5° (P = 0.038) , ANB decreased by 1.1° (P<0.001) , GoGn-SN decreased by 1.7° (P<0.001) , U1-NA decreased by 3.7 mm (P<0.001) , L1-NB decreased by 1.8 mm (P = 0.001) , U1-L1 increased by 16.6° (P<0.001) , U1-SN decreased by 8.2° (P<0.001) , OPP-SN decreased by 5.3° (P = 0.012) , FH-PP decreased by 0.9° (P = 0.041) , the differences were statistically significant. U6-PP decreased by 0.6 mm (P = 0.091) , L1-MP decreased by 0.6° (P = 0.058) , without statistically significant differences. Conclusions Invisalign is an effective appliance for treating open bite malocclusion with high angle for it can control the vertical height effectively, and rotate the mandible counterclockwise. Key words: Open bite; Malocclusion; Cephalometry; Invisalign techinique; High angle