DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
Accession Number:
AD1182647
Title:
An In Vitro Study on Aligner Rotational "Lag" with In-Office Clear Aligner Therapy
Report Date:
2020-06-30
Abstract:
The purpose of this study was to investigate the amount of rotational lag in Clear Aligner Therapy (CAT) in reference to maxillary anterior teeth. Methods: A 3D digital model with ideal alignment of maxillary teeth nos. 2-15 with cutouts at teeth nos. 6, 8, and 10 was fabricated. Plastic teeth were set in areas of cutouts in ideal alignment using a stent and then cutouts were filled with wax. A CAT series was created to rotate the plastic teeth from ideal to 9 deg of rotation in 6 aligners (1.5 deg between each aligner) using a hot water bath. Initial and final digital scans were compared via superimposition to calculate the amount of rotation. Lag was calculated by subtracting the amount of achieved rotation from 9 deg. Results: There were significant differences in rotational lag among tooth shapes (F(2, 105) = 13.14, p <.0001). Tooth no. 8 lag (Mean = 3.12, SD = 1.76) was significantly smaller than tooth no. 6 (Mean = 5.46, SD = 2.23)(p <.0001) and tooth #10 (Mean = 4.95, SD = 2.08) (p = 0.0007). No significant difference was found between tooth no. 6 and no. 10 (p = 0.55). Conclusions: The CAT series was significantly more efficient in rotating max central incisors than lateral incisors and canines. None of the teeth tested completed the full 9 deg of rotation.
Document Type:
Conference:
Journal:
Pages:
15
File Size:
1.46MB
Contracts:
Grants:
Distribution Statement:
Approved For Public Release
