Introduction
Orthodontics in China has developed rapidly, but there is no standard index of treatment
outcomes. We assessed the validity of the American Board of Orthodontics Objective
Grading System (ABO-OGS) for the classification of treatment outcomes in Chinese patients.
Methods
We randomly selected 108 patients who completed treatment between July 2005 and September
2008 in 6 orthodontic treatment centers across China. Sixty-nine experienced Chinese
orthodontists made subjective assessments of the end-of-treatment casts for each patient.
Three examiners then used the ABO-OGS to measure the casts. Pearson correlation analysis
and receiver operating characteristic curve analysis were conducted to evaluate the
correspondence between the ABO-OGS cast measurements and the orthodontists' subjective
assessments.
Results
The average subjective grading scores were highly correlated with the ABO-OGS scores
(r = 0.7042). Four of the 7 study cast components of the ABO-OGS score—occlusal relationship,
overjet, interproximal contact, and alignment—were statistically significantly correlated
with the judges' subjective assessments. Together, these 4 accounted for 58% of the
variability in the average subjective grading scores. The ABO-OGS cutoff score for
cases that the judges deemed satisfactory was 16 points; the corresponding cutoff
score for cases that the judges considered acceptable was 21 points.
Conclusions
The ABO-OGS is a valid index for the assessment of treatment outcomes in Chinese patients. By
comparing the objective scores on this modification of the ABO-OGS with the mean subjective assessment
of a panel of highly qualified Chinese orthodontists, a cutoff point for satisfactory
treatment outcome was defined as 16 points or fewer, with scores of 16 to 21 points
denoting less than satisfactory but still acceptable treatment. Cases that scored
greater than 21 points were considered unacceptable.
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe to American Journal of Orthodontics and Dentofacial OrthopedicsAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
References
- The occlusal index to assess orthodontic treatment.Br J Orthod. 1972; 2: 47-51
- The development of the PAR index (peer assessment rating): reliability and validity.Eur J Orthod. 1992; 14: 125-139
- Objective grading system for dental casts and panoramic radiographs. American Board of Orthodontics.Am J Orthod Dentofacial Orthop. 1998; 114: 589-599
- The development of the index of complexity, outcome and need (ICON).J Orthod. 2000; 27: 149-162
- Posttreatment tooth movement: for better or for worse.Am J Orthod Dentofacial Orthop. 2010; 138: 552-558
- The quality of treatment in the adult orthodontic patient as judged by orthodontists and measured by the objective grading system.Am J Orthod Dentofacial Orthop. 2011; 139: S69-S75
- Validity assessment and determination of the cutoff value for the index of complexity, outcome and need among 12-13 year-olds in Southern Chinese.Int J Oral Sci. 2012; 4: 88-93
- The validation of the peer assessment rating index for malocclusion severity and treatment difficulty.Am J Orthod Dentofacial Orthop. 1995; 107: 172-176
- Orthodontics in China.J Orthod. 2002; 29: 62-65
- The prevalence of malocclusion in China—an investigation of 25,392 children.Zhonghua Kou Qiang Yi Xue Za Zhi. 2002; 37: 371-373
- History and development of Chinese orthodontics.Beijing Da Xue Xue Bao. 2008; 18: 11-14
- Comprehensive clinical evaluation as an outcome assessment for a graduate orthodontics program.Am J Orthod Dentofacial Orthop. 2004; 126: 533-543
- Assessing treatment outcomes for a graduate orthodontics program: follow-up study for the classes of 2001-2003.Am J Orthod Dentofacial Orthop. 2006; 130: 648-655
- Comparison of university and private-practice orthodontic treatment outcomes with the American Board of Orthodontics objective grading system.Am J Orthod Dentofacial Orthop. 2005; 127: 707-712
- Assessment of orthodontic treatment outcomes: early treatment versus late treatment.Angle Orthod. 2005; 75: 162-170
- Invisalign and traditional orthodontic treatment postretention outcomes compared using the American Board of Orthodontics objective grading system.Angle Orthod. 2007; 75: 864-869
- Assessing the American Board of Orthodontics objective grading system: digital vs plaster dental casts.Am J Orthod Dentofacial Orthop. 2007; 131: 51-56
- Clinical use of the ABO-scoring index: reliability and subtraction frequency.Angle Orthod. 2003; 73: 556-564
- An introduction to ROC analysis.Pattern Recognition Lett. 2006; 27: 861-874
- Evaluation of the accuracy of digital model analysis for the American Board of Orthodontics objective grading system for dental casts.Am J Orthod Dentofacial Orthop. 2005; 128: 624-629
- Evaluation of a software program for applying the American Board of Orthodontics objective grading system to digital casts.Am J Orthod Dentofacial Orthop. 2008; 133: 283-289
Article Info
Publication History
Accepted:
April 2013
Received in revised form:
April 2013
Received:
January 2013
Footnotes
All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.
Supported by the Specific Research Project of Health Pro Bono Sector, Ministry of Health, China .
Identification
Copyright
© 2013 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.
