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[Clinical study of stress shielding after mini-plate internal fixation for mandibular fractures]
Shi-jun Liu1, Li-jun Wang, Xiao-ming Gu
1Department of Stomatology, General Hospital, Chinese People's Armed Police Forces, Beijing 100039, China.
Objective:
To investigate the stress shielding after mini-plate internal fixation for mandibular fractures.
Methods:
Eighteen patients with mandibular fractures were selected.X-rays were taken before operation and 3, 4, 6 months after operation when the plates were removed. The bone density of the mini plate area was examined and compared among different time interval groups.
Results:
The bone density before operation (125.41 ± 2.47) and 3 months after operation (120.19 ± 3.52) was not significantly different, but became lower 4 and 6 months after operation than before operation.
Conclusions:
There appeared stress shielding after internal fixation for 4 and 6 months in mandibular fracture, and the mini plate should be removed at those times.
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