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The effectiveness of Class II, division 1 treatment
K D O'Brien1, R Robbins, K W Vig
1Department of Dental Medicine and Surgery Unit of Orthodontics, University Dental Hospital of Manchester, England.
Summary
This study found that higher initial Peer Assessment Rating (PAR) scores predict longer orthodontic treatment duration for Class II, Division 1 malocclusions. However, only the initial PAR score impacted the final PAR score reduction.
Area of Science:
- Orthodontics
- Dental Public Health
- Evidence-Based Dentistry
Background:
- Class II, Division 1 malocclusions are common and require effective orthodontic treatment.
- Evaluating treatment effectiveness requires objective outcome measures like the Peer Assessment Rating (PAR) score.
- Understanding factors influencing treatment duration is crucial for efficient orthodontic practice.
Purpose of the Study:
- To assess orthodontic treatment effectiveness using the PAR score and treatment duration.
- To identify variables associated with treatment duration and PAR score changes in Class II, Division 1 malocclusions.
Main Methods:
- Retrospective analysis of 250 patient records from the University of Pittsburgh (1977-1989).
- Utilized multiple regression techniques to analyze relationships between treatment variables and outcomes.
- Outcome variables included percentage change in PAR score and treatment duration.
Main Results:
- Pretreatment PAR score, number of treatment stages, appointment attendance, appliance repairs, and extraction use significantly influenced treatment duration (p < 0.01).
- Only the pretreatment PAR score significantly impacted the percentage change in PAR score (p < 0.01).
Conclusions:
- Orthodontic treatment effectiveness for Class II, Division 1 malocclusions is primarily linked to the initial severity of the malocclusion.
- Factors such as patient compliance and treatment complexity significantly affect treatment duration.