The time course of orofacial muscle activities during deglutition in patients with mandibular prognathism between before and after orthognathic surgery

Abstract

between the lower irregularity index and GZN, and also between the upper irregularity index and IMPA. For female adult Mongolian Angle Class I subjects, it could be considered that the maxillofacial morphology and the occlusion of incisors have an influence on anterior crowding. http://dx.Class II adult case with high angle and severe crowding treated by unusual extraction Shigeki Iijima Iijima Orthodontic Office, Japan Orthod Waves-Jpn Ed 2012; 71(1): 53-60This case report describes the treatment of a female, aged 23 years and 8 months, having a high mandibular plane angle and Class II malocclusion with severe anterior crowding accompanied by high canines. Her oral hygiene was fair and she had several heavily restored molars. The orthodontic treatment involved the extraction of the microdont maxillary lateral incisors and second molars, mandibular left first and right second premolars and right second molar, and tooth alignment with a standard edgewise appliance in conjunction with high pull J-hook headgear. The active treatment was completed in 39 months. Class I molar relationships were achieved with an optimal overbite-overjet relationship. After a retention period of 32 months, the patient presented with an occlusion that was both functional and esthetically stable.http://dx.

Tongue pressure production during swallowing in patients with mandibular prognathism

“…Fukui et al . . investigated the pre‐operative and post‐operative time course of activity of maxillofacial muscles during swallowing in patients with mandibular prognathism who had been treated with orthognathic surgery.…”

“…compared the activity during swallowing of maxillofacial muscles involved in swallowing in patients with mandibular prognathism and individuals with normal occlusion and found that morphological disharmony was greatly affected by the amount of muscle activity, which prolonged the duration of sustained muscle activity during swallowing. Fukui et al (4). investigated the pre-operative and post-operative time course of activity of maxillofacial muscles during swallowing in patients with mandibular prognathism who had been treated with orthognathic surgery.…”

Tongue pressure and maxillofacial muscle activities during swallowing in patients with mandibular prognathism

“…The amount of test food was set at 4.0 mL per swallow since previous studies have indicated that this volume can be swallowed in a single gulp without mastication and it most closely reproduces natural swallowing. [9][10][11][24][25][26][27] The distribution of points at which tongue pressure was first exerted during tongue pressure production differed significantly between mandibular prognathism and control groups (Figure 2C). In the control group, tongue pressure most often occurred first in the anteromedian and mid-median parts of the palate, whereas tongue pressure in the mandibular prognathism group was more likely to arise first in peripheral parts.…”

“…prognathism has previously been studied in terms of masticatory function, 6,7 articulatory function 8 and swallowing function, [9][10][11] but few studies have focused on the latter and many points remain unclear.…”

“…Sasakura et al 10 also investigated patterns of activity of the oral and maxillofacial muscles during swallowing in patients with mandibular prognathism and reported that muscle activity persisted for significantly longer compared with that of healthy volunteers. Fukui et al 11 compared patterns of maxillofacial muscle activities during swallowing in patients with mandibular prognathism before and after surgery and healthy volunteers over time and showed that these more closely approached the characteristics of volunteers with normal occlusion when morphological discrepancies were improved.…”