Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
김지은, Mah Su-Jung, 김태우, 김수정, 박기호, 강윤구,
소속 상세정보
김지은 ( Kim Ji-Eun ) - Kyung Hee University School of Dentistry Department of Orthodontics
( Mah Su-Jung ) - Kyung Hee University Hospital at Gangdong Dental Hospital Department of Orthodontics
김태우 ( Kim Tae-Woo ) - Seoul National University School of Dentistry Department of Orthodontics
김수정 ( Kim Su-Jung ) - Kyung Hee University School of Dentistry Department of Orthodontics
박기호 ( Park Ki-Ho ) - Kyung Hee University School of Dentistry Department of Orthodontics
강윤구 ( Kang Yoon-Goo ) - Kyung Hee University School of Dentistry Department of Orthodontics
Abstract
Objective: The aim of this study was to determine cephalometric factors that help predict favorable soft-tissue profile outcomes following treatment with the Class II Twin-block appliance.
Methods: Pre- and post-treatment lateral cephalograms of 45 patients treated with the Class II Twin-block appliance were retrospectively analyzed. Profile silhouettes were drawn from the cephalograms and evaluated by three orthodontists in order to determine the extent of improvement. Samples were divided into a favorable group (upper 30% of visual analogue scale [VAS] scores, n = 14) and an unfavorable group (lower 30% of VAS scores, n = 14). Skeletal and soft-tissue measurements were performed on the cephalograms and an intergroup comparison was conducted.
Results: An independent t-test revealed that the following pre-treatment values were lower in the favorable group compared to the unfavorable group: lower incisor to mandibular plane angle, lower incisor to pogonion distance, point A-nasion-point B angle, sella-nasion line (SN) to maxillary plane angle, SN to mandibular plane angle, gonial angle, and symphysis inclination. The favorable group had a larger incisor inclination to occlusal plane. Moreover, the favorable group showed larger post-treatment changes in gonial angle, B point projection, and pogonion projection than did the unfavorable group.
Conclusions: Class II malocclusion patients with a low divergent skeletal pattern and reduced lower incisor protrusions are likely to show more improvement in soft-tissue profile outcomes following Class II Twin-block treatment.
키워드
Class II Twin-block; Soft-tissue profile; Cephalometric predictors
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