Southwest Bahia State University, Bahia, Brazil.
Postgraduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
Orthod Craniofac Res. 2024 Apr;27(2):185-192. doi: 10.1111/ocr.12716. Epub 2023 Oct 3.
Rapid maxillary expansion (RME) may change speech sound parameters due to the enlargement of oral and nasal cavities. This study aimed to systematically review the current evidence on speech changes as a side effect of RME. An electronic search was conducted in nine databases, and two of them accessed the 'grey literature'. The eligibility criteria included clinical studies assessing orthodontic patients with maxillary transverse deficiency and the relationship with speech alterations without restricting publication year or language. Only interventional studies were included. The JBI Critical Appraisal Tool assessed the risk of bias. The initial search provided 4853 studies. Seven articles (n = 200 patients) met the inclusion criteria and were analysed. The primary source of bias was the absence of a control group in four studies. RME altered speech production by changing vowel fundamental frequency and fricative phoneme formant frequency. Shimmer and jitter rates changed in one and two studies, respectively. Two studies presented deterioration during orthodontic treatment, but speech improved after appliance removal. Despite the limited evidence, RME affects speech during and after treatment.
快速上颌扩张（RME）可能会由于口腔和鼻腔的扩大而改变语音参数。本研究旨在系统回顾 RME 作为副作用引起语音变化的现有证据。在九个数据库中进行了电子搜索，其中两个数据库访问了“灰色文献”。纳入标准包括评估上颌横向发育不足的正畸患者与语音改变之间关系的临床研究，且不限制发表年份或语言。仅纳入干预性研究。JBI 批判性评估工具评估了偏倚风险。最初的搜索提供了 4853 项研究。符合纳入标准并进行分析的有 7 篇文章（n=200 名患者）。四项研究的主要偏倚来源是缺乏对照组。RME 通过改变元音基频和擦音音素共振峰频率来改变语音产生。颤音和齿擦音率分别在一项和两项研究中发生变化。两项研究在正畸治疗过程中出现恶化，但矫治器去除后语音改善。尽管证据有限，但 RME 会在治疗期间和治疗后影响语音。
