Skeletal Class Ⅲ patients treated with Fränkel function regulator type Ⅲ in the early and late mixed dentition

• Published in: Zhonghua kouqiang yixue zazhi Vol. 51; no. 5; p. 257
• Main Authors: Du, Yajing, Huang, Shiyan, Rao, Nanquan, Xu, Shuhao, Li, Xiaobing
• Format: Journal Article
• Language: Chinese
• Published: China 01.05.2016
• Subjects: Cephalometry; Child; Dentition, Mixed; Female; Humans; Male; Malocclusion, Angle Class III - therapy; Orthodontic Appliances, Functional; Overbite - etiology; Time-to-Treatment; Treatment Outcome
• ISSN: 1002-0098
• DOI: 10.3760/cma.j.issn.1002-0098.2016.05.001

To investigate the outcome of skeletal Class Ⅲ patients treated with Fränkel function regulator type Ⅲ (FR Ⅲ)in the early mixed and late mixed dentition. The samples consisted of 45 mild and moderate skeletal Class Ⅲ patients(26 males, 19 females; meanage, [7.9±1.3] years) treated with FR Ⅲ. According to Hellman's dental developmental stages, these samples were divided into early-treated group(n=24) and late-treated group(n=21). Lateral cephalograms were taken at the beginning and the end of treatment. Twenty-one measurements on hard and soft tissue were included. After treatment, SNA, ANB, NA-Apo, Wits, U1-SN, U1-NA, Overjet, UL-EP were significantly increased (1.0±1.9)°, (1.2±1.6)°, (2.6±4.2)°, (1.8±2.7) mm, (4.2±7.6)°, (2.6±7.5)°, (3.6±2.3) mm and (0.8±2.2) mm(P<0.05). OP-SN and IMPA were significantly decreased (1.5±3.7)°and (1.4±4.2)°(P<0.05). There were significant differences in SNA, ANB, UL-EP, IMPA, L1-NB between early-treated group and late-treated group(P<0.05). FR Ⅲ was suitable for the treatment