Related Experiment Video
Updated: May 19, 2026
08:05
A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers
Published on: January 5, 2018
Relapse revisited--again.
Kenneth C Dyer1, James L Vaden, Edward F Harris
1Chattanooga, TN, USA.
Summary
Orthodontic treatment shows good long-term stability, with most patients maintaining corrected alignment and occlusion for over 2 decades after active treatment and retention.
Area of Science:
- Orthodontics
- Dental Cast Analysis
- Longitudinal Study
Background:
- Limited long-term data exists on orthodontic patient dentition changes post-treatment.
- Most studies report findings only a few years after treatment completion.
Purpose of the Study:
- To assess long-term changes in orthodontic patient dentitions an average of 24 years post-treatment.
- To determine if incisor irregularity increases over time and quantify relapse after conservative treatment.
Main Methods:
- Analysis of dental casts from 52 women treated with standard edgewise appliances (mid-1970s-early 1980s).
- Patients received Hawley or canine-to-canine retainers for 24-32 months.
- Measurements included incisor overjet/overbite, buccal segment relationships, and incisor irregularity using digital calipers.
Main Results:
- 77% of patients had less than 3.5 mm of mandibular incisor irregularity at long-term recall.
- Maxillary incisor irregularity correction remained stable.
- Buccal segment Class II correction demonstrated stability.
Conclusions:
- Orthodontic treatment can achieve favorable long-term stability in occlusal correction.
- Good long-term stability in tooth alignment is achievable with orthodontic intervention.
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