Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (48): 8964-8967.doi: 10.3969/j.issn.1673-8225.2011.48.009

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Initial stress distribution of the maxillary anterior teeth, periodontal ligament and alveolar bone by different intruding loadings:A three-dimensional finite element analysis

Lu Hong-fei1, Mai Zhi-hui1, Chen Qi1, Chen Yue2, Ai Hong1   

  1. 1Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou  510630, Guangdong Province, China
    2Shanghai Branch Office, 3M China Ltd., Shanghai  200336, China
  • Received:2011-07-16 Revised:2011-09-04 Online:2011-11-26 Published:2011-11-26
  • Contact: Ai Hong, Master, Professor, Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong Province, China aih_zssy09@126.com
  • About author:Lu Hong-fei★, Master, Attending physician, Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong Province, China lhf_dr@163.com

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Abstract:

BACKGROUND: It is very important to explore an optimal loading force that can both allow effective intrusion and cause no damage to the teeth.
OBJECTIVE: To investigate the optimal loading conditions, including loading force values and directions, in the intruding mechanics of maxillary anterior teeth.
METHODS: A three-dimensional finite element model (3D FEM) of the maxillary anterior teeth was constructed to include the periodontal ligament (PDL), alveolar bone, and appliance (brackets and wire). The initial stress distribution and force of the maxillary anterior teeth were analyzed when the 3D FEM was loaded with different intruding force values and directions.
RESULTS AND CONCLUSION: The optimal value of the intruding force for 6 anterior teeth fell within the range from 0.5 N to 1.0 N. The maximum stress was detected at the distal cervical level of the lateral incisor, and a relatively even distribution of initial stress was observed at 20° palatal deviation to the Y axis. The results suggest that using mini-screw implants at the labial region between the canine and lateral incisor and a combined 0.5-1.0 N intruding force with a distal force could be an optimal intrusion force system by which patients with normal occlusion could obtain a pure intrusion of anterior teeth.

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