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KMID : 0361920110410030154
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Korean Journal of Orthodontics
2011 Volume.41 No. 3 p.154 ~ p.163
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Quantitative evaluation and affecting factors of post-treatment relapse tendency
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Son Woo-Sung
Cha Kyung-Suk
Jung Dong-Hwa
Kim Tae-Woo
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Abstract
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Objective: The purpose of this study was to quantitatively evaluate relapse tendency after orthodontic treatment and determine the contributing factors by using the American Board of Orthodontics objective grading system (ABO-OGS).
Methods:The subjects were 80 patients with more than 2 years of retention period after completing orthodontic treatment at the dental hospitals of Busan University, Kyunghee University, and Dankook University. The posttreatment (T2) and post-retention (T3) ABO-OGS measurements were analyzed in relation to age, gender, Angle’s classification, extraction, retention period, and pretreatment condition (initial peer assessment rating (PAR) index, T1) by multiple regression analysis.
Results: Among the 7 ABO-OGS criteria, alignment worsened but occlusal contact and interproximal contact improved in T3, but not in T2 (p ＜ 0.01). The 4 other criteria showed no significant differences. Multiple regression analysis showed that alignment, occlusal relationship, overjet, and interproximal contact were significant linear models, but with a low explanation power. Age, gender, Angle’s classification, extraction, retention period, and pretreatment condition (initial PAR index, T1) had little influence on the ABO-OGS changes between T3 and T2.
Conclusions: An orthodontist’s understanding of posttreatment relapse tendency can be useful in diagnosis and during patient consultation.
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KEYWORD
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Relapse, PAR index, ABO-OGS, Occlusal index
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