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《West China Journal of Stomatology》 2016-04
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Effects of Hawley retainer and vacuum-formed retainer on articulation of Chinese speech of adult orthodontic patients: a randomized controlled trial

Wan Jia;You Lun;Chen Junyu;Chen Zhiqiang;Wang Tong;School of Foreign Languages,University of Electronic Science and Technology;State Key Laboratory of Oral Diseases,Dept.of Orthodontics,West China Hospital of Stomatology,Sichuan University;State Key Laboratory of Oral Diseases,Dept.of Prosthodontics,West China Hospital of Stomatology,Sichuan University;  
Objective This study investigated the influence of Hawley retainer and vacuum-formed retainer on the articulation of Chinese speech of adult orthodontic patients. Methods A total of 20 volunteers were recruited in this randomized controlled trial in accordance with the inclusion criteria. Participants were randomly distributed into two groups, namely, the Hawley retainer group and the vacuum-formed retainer group. Speech performance was evaluated at the following time intervals: before wearing retainers(T0), immediately after wearing both upper and lower retainers(T1), 24 h later(T2), 1 week later(T3), and 1 month later(T4). The phonetic parameters were acquired through the use of computer-based voice analysis software Praat version 5.4.21, and the final data were analyzed using SPSS 19.0. Results Both retainers can influence the phonetic parameters of vowels /e/, /i/, and /ü/ and consonants /s/, /f/, /x/, /t/, /j/, and /q/. However, the Hawley retainer showed a more remarkable effect on the articulation of Chinese speech, and the distortion of /i/, /ü/, and /s/ sounds can last for more than 1 month. Nevertheless, the recovery period of the patients' phonetic function in the vacuum-formed retainer group was within 1 month. Conclusion Both retainers can induce distortion of some Chinese vowels and consonants in the speech of adult orthodontic patients, but the Hawley retainer can more significantly influence the articulation of Chinese speech than vacuum-formed retainer.
【Fund】: 电子科技大学2015年中央高校基本科研业务费项目(学生创新创业项目);; 四川省科技厅科技支撑计划(2015SZ0078);; 国家留学基金委优秀本科生国际交流项目[留金发(2015)3074号]~~
【CateGory Index】: R783.5
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【Citations】
Chinese Journal Full-text Database 4 Hits
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1 Wan Jia;You Lun;Chen Junyu;Chen Zhiqiang;Wang Tong;School of Foreign Languages,University of Electronic Science and Technology;State Key Laboratory of Oral Diseases,Dept.of Orthodontics,West China Hospital of Stomatology,Sichuan University;State Key Laboratory of Oral Diseases,Dept.of Prosthodontics,West China Hospital of Stomatology,Sichuan University;;Effects of Hawley retainer and vacuum-formed retainer on articulation of Chinese speech of adult orthodontic patients: a randomized controlled trial[J];华西口腔医学杂志;2016-04
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