Biondi E, Bandini A, Lombardo L, Orlandi S, Siciliani G, Manfredi C
Department of Orthodontics, University of Ferrara, Ferrara, Italy.
Department of Information Engineering, University of Firenze, Firenze, Italy.
Orthod Craniofac Res. 2017 Feb;20(1):21-29. doi: 10.1111/ocr.12136.
To investigate possible changes and/or device-related impairments in phonetic habits produced by rapid maxillary expansion (RME).
Thirty-five patients scheduled for RME were divided into two groups: Group A (banded two-arm Hyrax) and Group B (banded four-arm Hyrax). Speech samples were collected at six time points, before, during and after RME removal. Acoustical analysis was performed using PRAAT and BioVoice analysis tools. Ten volunteers completed a questionnaire on the acceptability of patient's speech. Maxillary dimensions and palatal volume were measured on dental casts before and after expansion using a digital gauge.
Voice analysis showed an increase in the peak frequency of fricative consonants (/s/,/ʃ/) after expansion, whereas there was no change of formant frequencies of palatal consonants (/ɲ/,/ʎ/). Vowel /i/ displayed a lowering of the first formant frequency, and an increase in the second and third formant frequencies. After bonding, Group B showed both a greater reduction in the peak frequency of fricatives and a greater increase in the formant frequencies of palatal consonants than Group A.
Rapid maxillary expansion causes a slight phonetic change in the acoustical parameters of both consonants and vowels. The two-arm Hyrax caused less speech impairment than the four-arm Hyrax during the treatment.
研究快速上颌扩弓（RME）导致的语音习惯可能发生的变化和/或与装置相关的损伤。
35例计划接受RME治疗的患者被分为两组：A组（带环双臂Hyrax矫治器）和B组（带环四臂Hyrax矫治器）。在RME矫治器拆除前、拆除过程中和拆除后六个时间点采集语音样本。使用PRAAT和BioVoice分析工具进行声学分析。10名志愿者完成了一份关于患者语音可接受性的问卷。使用数字量规在扩弓前后的石膏模型上测量上颌尺寸和腭部容积。
语音分析显示，扩弓后摩擦辅音（/s/、/ʃ/）的峰值频率增加，而腭辅音（/ɲ/、/ʎ/）的共振峰频率没有变化。元音/i/的第一共振峰频率降低，第二和第三共振峰频率增加。粘结后，B组摩擦音的峰值频率降低幅度和腭辅音的共振峰频率增加幅度均大于A组。
快速上颌扩弓会导致辅音和元音的声学参数发生轻微的语音变化。在治疗过程中，双臂Hyrax矫治器比四臂Hyrax矫治器导致的语音损伤更小。
