The effect of orthognathic surgery on speech function in patients with skeletal Class Ⅲ malocclusion

doi:10.19439/j.sjos.2021.04.011

Abstract

Abstract: PURPOSE: To investigate the influence of the position of the upper and lower jaws on the anatomical structure of pharynx before and after orthognathic surgery in patients with skeletal Class Ⅲ malocclusion. METHODS: Craniofacial CT scan and speech data were collected from 31 patients with skeletal Class Ⅲ malocclusion before and 3 months after surgery. The collected CT data was imported into Dolphin imaging 11.95 software to establish a digital original model, and the anatomical structure of the pharynx was measured and analyzed. Speech data were analyzed objectively and subjectively by Computerized Speech Lab 4500b and professional speech specialists. Statistical analysis was performed using SPSS 24.0 software package. RESULTS: The distance from the lower edge of the soft palate to the posterior pharyngeal wall, the shortest distance from the posterior margin of the tongue to the posterior pharyngeal wall and its corresponding cross-sectional area were significantly different from those before surgery (P<0.05). The changes of SNA, SNB, ANB, OJ, and OBJ before and after surgery were significant in this series. Importantly, the speech intelligibility of orthognathic patients before and after surgery changed significantly subjectively (P<0.05). Objectively, the postoperative vowels /a/B2, B3, B4, /i/B1,B2, /u/B1,B2 and B4 of the patients were significantly different from those before surgery. There was no significant difference in the lower limit frequency of the consonants /x/, /zh/, /s/, the energy value of /zh/ and the grammatical form of /z/ before and after surgery. The maxillary advancement distance was highly correlated or significantly correlated with △S1, △VOP, and voice changes. CONCLUSIONS: Orthognathic surgery moves the upper and lower jaws to cause changes in the anatomy of the pharyngeal cavity, leading to changes of postoperative speech.

Key words: Orthognathic surgery, Skeletal Class Ⅲ malocclusion, Pharyngeal cavity anatomy, Speech function

CLC Number:

R782.2

MENG Kun, SUN Jian, LI Ya-li, LIU Yan-shan, CHEN Chen, XU Ze-xian, SUN Ming, ZHANG Xiu-xiu, ZHOU Dong-yang. The effect of orthognathic surgery on speech function in patients with skeletal Class Ⅲ malocclusion[J]. Shanghai Journal of Stomatology, 2021, 30(4): 394-401.

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