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Long-term posttreatment changes measured by the American Board of Orthodontics objective grading system.
Am J Orthod Dentofacial Orthop. 2005 Apr; 127(4):444-50; quiz 516.AJ

Abstract

BACKGROUND

The American Board of Orthodontics (ABO) developed the objective grading system (OGS) to evaluate cases submitted as part of the phase III examination for board certification. This study examines the long-term changes in 6 of the 8 criteria measured by the board, with an emphasis on the relationship between posttreatment results and subsequent improvement or worsening.

MATERIAL

One hundred subjects were randomly chosen from the postretention archives of the Department of Orthodontics at the University of Washington. Pretreatment peer assessment rating (PAR) scores and posttreatment and postretention OGS scores were measured on study casts. The ABO criteria studied were alignment, marginal ridges, buccolingual inclinations, occlusal contacts, occlusal relationships, and overjet. Interproximal contacts and root angulations were not scored.

RESULTS

The mean overall OGS score at posttreatment was 21.5 points. At postretention, this score had improved significantly, by approximately 4 points. When comparing posttreatment scores and long-term changes, similar patterns were seen for all criteria, except alignment; increased posttreatment scores were associated with increased long-term improvement. Well-treated cases tended to deteriorate, and poorly finished cases tended to improve, illustrating a regression to the mean. Alignment was the only criterion associated with a mean long-term worsening, as well as a less predictable pattern of change.

CONCLUSIONS

The results of this study indicate that settling occurs after orthodontic treatment, and that the attainment of perfect occlusal results does not ensure stability.

Authors+Show Affiliations

Department of Orthodontics, University of Washington, Seattle 98195-7446, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15821689

Citation

Nett, Brian C., and Greg J. Huang. "Long-term Posttreatment Changes Measured By the American Board of Orthodontics Objective Grading System." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 127, no. 4, 2005, pp. 444-50; quiz 516.
Nett BC, Huang GJ. Long-term posttreatment changes measured by the American Board of Orthodontics objective grading system. Am J Orthod Dentofacial Orthop. 2005;127(4):444-50; quiz 516.
Nett, B. C., & Huang, G. J. (2005). Long-term posttreatment changes measured by the American Board of Orthodontics objective grading system. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 127(4), 444-50; quiz 516.
Nett BC, Huang GJ. Long-term Posttreatment Changes Measured By the American Board of Orthodontics Objective Grading System. Am J Orthod Dentofacial Orthop. 2005;127(4):444-50; quiz 516. PubMed PMID: 15821689.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Long-term posttreatment changes measured by the American Board of Orthodontics objective grading system. AU - Nett,Brian C, AU - Huang,Greg J, PY - 2005/4/12/pubmed PY - 2005/5/3/medline PY - 2005/4/12/entrez SP - 444-50; quiz 516 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 127 IS - 4 N2 - BACKGROUND: The American Board of Orthodontics (ABO) developed the objective grading system (OGS) to evaluate cases submitted as part of the phase III examination for board certification. This study examines the long-term changes in 6 of the 8 criteria measured by the board, with an emphasis on the relationship between posttreatment results and subsequent improvement or worsening. MATERIAL: One hundred subjects were randomly chosen from the postretention archives of the Department of Orthodontics at the University of Washington. Pretreatment peer assessment rating (PAR) scores and posttreatment and postretention OGS scores were measured on study casts. The ABO criteria studied were alignment, marginal ridges, buccolingual inclinations, occlusal contacts, occlusal relationships, and overjet. Interproximal contacts and root angulations were not scored. RESULTS: The mean overall OGS score at posttreatment was 21.5 points. At postretention, this score had improved significantly, by approximately 4 points. When comparing posttreatment scores and long-term changes, similar patterns were seen for all criteria, except alignment; increased posttreatment scores were associated with increased long-term improvement. Well-treated cases tended to deteriorate, and poorly finished cases tended to improve, illustrating a regression to the mean. Alignment was the only criterion associated with a mean long-term worsening, as well as a less predictable pattern of change. CONCLUSIONS: The results of this study indicate that settling occurs after orthodontic treatment, and that the attainment of perfect occlusal results does not ensure stability. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/15821689/Long_term_posttreatment_changes_measured_by_the_American_Board_of_Orthodontics_objective_grading_system_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540604011084 DB - PRIME DP - Unbound Medicine ER -