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Age effect on orthodontic tooth movement in rats.
Y Ren1, J C Maltha, M A Van 't Hof
1Department of Orthodontics & Oral Biology, University Medical Center Nijmegen, College of Dental Science, The Netherlands. j.maltha@dent.umcn.nl
Journal of Dental Research
|January 1, 2003
Summary
Orthodontic tooth movement is slower to start in adult rats but progresses at the same rate as in juveniles once initiated. This suggests adults experience a delay in initial tissue response, not reduced long-term efficiency.
Area of Science:
- Biomedical Engineering
- Orthodontics
- Periodontology
Background:
- Orthodontic treatment duration varies between age groups, potentially due to differences in tissue response and cellular turnover rates.
- Adults may exhibit delayed initial tissue responses or slower bone and periodontal ligament turnover compared to juveniles.
- Understanding age-related differences in orthodontic tooth movement is crucial for optimizing treatment strategies.
Purpose of the Study:
- To compare the rate and efficiency of orthodontic tooth movement in juvenile and adult rats.
- To investigate the influence of age on the initial phase and linear phase of tooth movement.
- To elucidate the underlying mechanisms of age-related differences in orthodontic treatment response.
Main Methods:
- Two groups of 30 rats were used, aged 6 weeks (juveniles) and 9-12 months (adults).
- A standardized orthodontic appliance delivered a 10 cN mesial force to three maxillary molars on one side.
- The contralateral side served as a control, with tooth movement measured over time.
Main Results:
- Initial orthodontic tooth movement was significantly faster in juvenile rats compared to adult rats.
- Once the linear phase of tooth movement was reached, the rate of movement was comparable between juvenile and adult groups.
- A delay in the onset of tooth movement was observed in adult animals.
Conclusions:
- Age-related differences in orthodontic tooth movement are primarily characterized by a delayed onset in adults.
- The rate of tooth movement becomes similar in both juvenile and adult rats once movement is initiated.
- Orthodontic treatment can be equally efficient in adults as in juveniles, provided the initial delay is considered.