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首页> 外文期刊>Journal of oral rehabilitation >Improvements in smoothness of chewing cycles in adults with mandibular prognathism after surgery: A longitudinal study
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Improvements in smoothness of chewing cycles in adults with mandibular prognathism after surgery: A longitudinal study

机译：一项纵向研究，改善了下颌预后成人的咀嚼周期的顺畅性：一项纵向研究

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Although adults with mandibular prognathism are known to show impaired smoothness of masticatory jaw movements, it remains uncertain whether/how the surgical-orthodontic treatment is effective to improve masticatory jaw movements. The aims of this study were (i) to verify whether the surgical-orthodontic treatment of patients with mandibular prognathism improve smoothness of the chewing jaw movements post-operatively and, if so, (ii) to examine whether the improved parameters show similar quantities as those of the control subjects. The chewing jaw movements for 13 patients with mandibular prognathism were recorded at pre- and post-treatment stages. The patient group was divided into two groups: Class IIIclosed showed full occlusal contact at the habitual intercuspal position, whereas Class IIIopen showed inability of occlusal contact between the upper and lower anterior teeth. The control group (CG) consisted of 52 subjects having acceptably good occlusion. The normalised jerk cost (NJC), movement duration and peak velocity in jaw closing were compared. For both Class IIIopen and Class IIIclosed groups, statistical comparisons revealed that the NJC and movement duration were decreased after the treatment, whereas the peak velocity was increased (all P 0·01). For the Class IIIopen, these quantities at the post-treatment stage did not show any significant differences compared with those for the CG. It is concluded that the smoothness of chewing jaw movements for patient with mandibular prognathism were improved after treatment, and for the patients with anterior open bite at pre-treatment, the post-operatively achieved smoothness of jaw-closing movements did not differ from those of the CG.
机译：尽管已知患有下颌前突的成年人表现出咀嚼下颌运动的平滑度受损，但仍不确定手术/正畸治疗是否有效/如何有效改善咀嚼下颌运动。这项研究的目的是（i）验证对下颌前突患者进行正畸的手术治疗是否能改善术后颌骨运动的顺畅度;如果是，（ii）检查改善的参数是否显示与那些对照对象。在治疗前和治疗后记录了13名下颌前突患者的咀嚼动作。患者组分为两组：III级闭合显示在习惯性牙间位置完全咬合，而IIIopen级显示上，下前牙之间无法咬合。对照组（CG）由52名具有可接受的良好咬合的受试者组成。比较了标准化的急动成本（NJC），运动持续时间和颚闭合中的峰值速度。对于III类开放组和III类封闭组，统计学比较显示，治疗后NJC和运动持续时间减少，而峰值速度增加（所有P <0·01）。对于Class IIIopen，在后处理阶段的这些数量与CG相比没有任何显着差异。结论是，治疗后下颌妊娠的患者咀嚼颌运动的平滑度得到了改善，而对于前开口咬合的患者，在治疗前，其术后闭合颌运动的平滑度与正常情况无差异。 CG。

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