Tongue–palatal contact changes in patients with skeletal mandibular prognathism after sagittal split ramus osteotomy: an electropalatography study

Abstract

The purpose of this study was to investigate the changes in tongue-palatal contact patterns using electropalatography (EPG) before and after sagittal split ramus osteotomy (SSRO) in patients with mandibular prognathism. Nine clients who underwent SSRO for mandibular setback and seven control subjects were participated in this study. Tongue-palatal contact patterns for /t/, /s/ and /k/ production were investigated using EPG before surgery and 3 months after surgery. The mean value of whole total of palate contact (WT) in the maximum contact frame was examined before and after SSRO. The correlation quantity between the change of center of gravity (COG) value and the amount of mandibular setback was also evaluated. The mean value of WT for /t/ and /s/ significantly increased after SSRO, and the EPG pattern became normal. However, a remarkable change in WT for /k/ was not observed, and the mean value was significantly larger in the SSRO group before and after surgery than in the control group. A negative correlation between COG variation and the amount of mandibular setback for /t/ and positive correlation for /s/ was observed. This study demonstrated that tongue-palatal contact patterns for /t/ and /s/ articulation improved clearly after SSRO. There was a significant correlation between COG variation and the amount of mandibular setback. However, no significant change was detected through perceptual assessment before and after SSRO. Further investigation is needed to determine whether these results will change over time.

Changes in tongue–palatal contact during swallowing in patients with skeletal mandibular prognathism after orthognathic surgery

“…Electropalatography (EPG) is a portable device composed of an acrylic palatal base plate with 62 electrodes and an electrically connected personal computer, which permits the visualization of tongue-palatal contact during speech [ 6 , 7 ]. Recently, Kojima et al reported that tongue-palatal contact patterns for /t/ and /s/ articulation improved clearly after SSRO in patients with mandibular prognathism by EPG study [ 8 , 9 ]. Ichida et al showed that tongue-palatal contact duration associated with swallowing was closely related to the patient’s maxillofacial morphology by EPG study [ 10 ].…”

Speech Disorders in Dysgnathic Adult Patients in the Field of Severity of Primary Dysfunction

“…These findings are in agreement with our study as the patients with the non-normative articulation of /t/ and /s/ also had the incorrect type of swallowing, which means that the palatal-tongue contact was disturbed. Kojima et al [21] suggested that orthognathic surgery can improve the malocclusion and skeletal jaw relationship and tongue-palate position during post-operative articulation. Considering tongue thrust, Mozzanica et al [22] also stated that patients with tongue thrust perform forward movements and interpose the tongue between their teeth while speaking and swallowing with consecutive pressure against the lingual surfaces of the anterior teeth and altered tongue position in the oral cavity.…”

“…All phonemes require exact elevation of the tongue and its placement over the hard palate and the alveolar ridge. Kojima et al [21] conducted research on tonguepalatal contact changes in patients with skeletal mandibular prognathism after sagittal split ramus osteotomy and found that whole total of palate tongue. To summarise, the conducted study accompanied by a literature review reveals that primary functions such as breathing, swallowing, chewing and biting are usually distorted in patients affected by malocclusion in class II and class III and impair articulation of speech intelligibility.…”

Three‐Dimensional Touch Device with Two Terminals

“…Diseases such as malocclusion or sleep apnea can be diagnosed in advance by detecting abnormalities in the tongue's position. [32][33][34][35][36] Figure 6f shows that the normal tongue position differs from that in cases of malocclusion or sleep apnea, and this fact can be used for making a quick preliminary diagnosis. Moreover, conditions like cerebrovascular diseases (e.g., stroke or concussion) can be diagnosed by analyzing differences between tongue pressures applied to the roof of the mouth.…”