Damping effects on the response of maxillary incisor subjected to a traumatic impact force: A nonlinear finite element analysis

Huang, Haw-Ming; Tsai, Chi-Yang; Lee, Hao-Fu; Lin, Che-Tong; Yao, Wei-Cheng; Chiu, Wen-Ta; Lee, Sheng-Yang

doi:10.1016/j.jdent.2005.06.007

« Previous Next »Journal of Dentistry
Volume 34, Issue 4 , Pages 261-268, April 2006

Damping effects on the response of maxillary incisor subjected to a traumatic impact force: A nonlinear finite element analysis

Haw-Ming Huang
- Graduate Institute of Oral Sciences, Taipei Medical University, Taipei, Taiwan, ROC
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan, ROC
Chi-Yang Tsai
- Institute of Oral Rehabilitation Sciences, School of Dentistry, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan, ROC
Hao-Fu Lee
- Institute of Oral Rehabilitation Sciences, School of Dentistry, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan, ROC
Che-Tong Lin
- Graduate Institute of Oral Sciences, Taipei Medical University, Taipei, Taiwan, ROC
Wei-Cheng Yao
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan, ROC
- Department of Anesthesiology, Min-Sheng General Hospital, Taoyuan, Taiwan, ROC
Wen-Ta Chiu
- Department of Neurosurgery, Municipal Wan Fang Hospital, Taipei, Taiwan, ROC
- Institute of Injury Prevention & Control, Taipei Medical University, Taipei, Taiwan, ROC
Sheng-Yang Lee
- Institute of Oral Rehabilitation Sciences, School of Dentistry, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan, ROC
- Corresponding author. Tel.: +886 2 2736 1661x5123; fax: +886 2 2736 2295/2778 5383.

Received 28 September 2004; received in revised form 23 June 2005; accepted 27 June 2005.

Summary

Objectives

The aim of this study was to evaluate the effects of damping on stress concentration in an impacted incisor.

Methods

Damping ratios of maxillary incisors were tested using an in vivo modal testing method. A finite element model of the upper central incisor was established for dental trauma analysis. To assess the effect of damping properties on induced stresses in the traumatized incisors, equivalent stresses in the finite element model with various damping ratios were calculated for comparison. The mechanisms of cushioning properties of the upper incisors on traumatic injuries were assessed by profiling the stress distributions in the incisor model sequentially with time.

Results

The measured damping ratio of maxillary incisors was 0.146±0.037. When the incisor was subjected to an impact force, high stresses were concentrated at the labial and lingual incisor edges, cervical ridge, and the area around root apex. When the damping ratios of the incisor model were set at 10- and 50-fold of the measured values, the peak stresses induced near the impact site of the incisor model were reduced from 24.0 to 23.2 and 15.9MPa, respectively. On the other hand, the peak stress lagged and the stress existence period increased when the damping properties were taken into consideration.

Conclusions

Damping properties of teeth provide protection to the tooth during traumatic injury by decreasing the peak stress magnitude due to release of strain energy over a longer period.

Keywords: Dental trauma, Finite element method, Damping ratio, Stress