Presentation Category
Research
Introduction/Context/Diagnosis
Objectives: This study aimed to compare 1) treatment time, 2) treatment outcome, and 3) treatment effects in regards to dental and skeletal changes of class II molar correction in growing patients between cases using Invisalign mandibular advancement (MA) and class II elastic simulation jump. Methods: 44 growing patients with Class II malocclusion were included: 17 patients in the class II elastic group and 27 in the Invisalign MA group. Molar relationships on digital casts at pre-treatment (T1) and end-of-active-treatment (T2) for each treatment group were obtained. 3Shape software was used to measure the amount of Class II correction by comparing molar relationship, overjet (OJ), and overbite (OB) at T1 and T2 respectively. Measurements were taken separately by 2 students, and averaged before data analysis. Results: The average molar correction was greater for the MA group (-3.48 ± 1.47mm) than the elastics group (-2.88 ± 1.43mm) with negative signs indicating correction to Class I. Treatment time was longer in the MA group, averaging 33.13 ± 12.91 months while the elastics group averaged 26.05 ± 12.93 months. The average overjet correction was greater for the MA group (-3.20 ± 1.83mm) than the elastics group (-2.16 ± 1.79mm). The average overbite correction was slightly greater in the MA group (-2.01 ± 1.21mm) than in the elastics group (-1.49 ± 1.0mm). Conclusions: Both mandibular advancement and class II elastic jump using clear aligner therapy successfully corrected class II malocclusion. Invisalign MA performed significantly better at correcting molar relationships, but its ability to correct overjet and overbite compared to the elastic jump method is statistically insignificant. While Invisalign MA requires longer treatment time on average, the difference is statistically insignificant. Acknowledgements: IRB #2022103 approved.
Location
Arthur A Dugoni School of Dentistry, 155 5th St, San Francisco, CA 94103, USA
Format
Presentation
Methods of Class II Correction in Growing Patients using Clear Aligner Therapy
Arthur A Dugoni School of Dentistry, 155 5th St, San Francisco, CA 94103, USA
Objectives: This study aimed to compare 1) treatment time, 2) treatment outcome, and 3) treatment effects in regards to dental and skeletal changes of class II molar correction in growing patients between cases using Invisalign mandibular advancement (MA) and class II elastic simulation jump. Methods: 44 growing patients with Class II malocclusion were included: 17 patients in the class II elastic group and 27 in the Invisalign MA group. Molar relationships on digital casts at pre-treatment (T1) and end-of-active-treatment (T2) for each treatment group were obtained. 3Shape software was used to measure the amount of Class II correction by comparing molar relationship, overjet (OJ), and overbite (OB) at T1 and T2 respectively. Measurements were taken separately by 2 students, and averaged before data analysis. Results: The average molar correction was greater for the MA group (-3.48 ± 1.47mm) than the elastics group (-2.88 ± 1.43mm) with negative signs indicating correction to Class I. Treatment time was longer in the MA group, averaging 33.13 ± 12.91 months while the elastics group averaged 26.05 ± 12.93 months. The average overjet correction was greater for the MA group (-3.20 ± 1.83mm) than the elastics group (-2.16 ± 1.79mm). The average overbite correction was slightly greater in the MA group (-2.01 ± 1.21mm) than in the elastics group (-1.49 ± 1.0mm). Conclusions: Both mandibular advancement and class II elastic jump using clear aligner therapy successfully corrected class II malocclusion. Invisalign MA performed significantly better at correcting molar relationships, but its ability to correct overjet and overbite compared to the elastic jump method is statistically insignificant. While Invisalign MA requires longer treatment time on average, the difference is statistically insignificant. Acknowledgements: IRB #2022103 approved.
Comments/Acknowledgements
Presentation Category: Research