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Published on: February 23, 2024
Effects of lower central incisors's biomechanics at different mixed dentition stages using clear aligners for deep
Meiying Wu1, Yue Li1, Xinyu Xing1
1Yunnan Key Laboratory of Stomatology & Department of Orthodontics, The Affiliated Stomatology Hospital, Kunming Medical University, Kunming, 650106, China.
Background:
This study aimed to investigate the effects of various intrusion modes on the movement trends and stress distribution of lower teeth at different stages in lower central incisors during deep overbite in mixed dentition treated with clear aligners.
Methods:
Three-dimensional finite element models were constructed to represent lower central incisors at different stages of Demirjian classification (stages F, G and H). Three protocols were designed to intrude lower central incisors (intrusion modes I, II and III). The analysis was conducted on the movement trends and stress distribution of the lower teeth.
Results:
Regardless of root developmental stages of lower central incisors, the trend of mesial and labial movements were observed during the intrusion process. The stress in the periodontal membranes was primarily concentrated at the labial neck and lingual root apex of the lower anterior incisors. At stages F and G, intrusion mode III exhibited the most obvious movement trend along the intrusion direction. Conversely, intrusion mode I demonstrated the most significant movement trend in the stage H.
Conclusion:
The displacement observed along the Z-axis (intrusion direction) was greatest for Mode III at stages F/G, and greatest for Mode I at stage H. Therefore, the factors such as the development of teeth roots, intrusion amount and modes should be fully considered for a reasonable design in clinic, which could improve the treatment efficiency.
