In order to achieve better facial esthetics, functional occlusion, maintaining tissue health and stable treatment results, orthognathic surgery is required in certain orthodontic patients. While planning orthognathic surgery, we should inform patients benefits and risks associated in this treatment modality. Possible side effects including the post-operational temporary physiological influences to the patient should be mentioned.Thus, patients will be less anxious and deal with those problems more comfortably. The most common post-operation influences of orthognathic surgery is hypomobility. The objective measurements for mandibular function are maximum mouth opening (MMO), maximum bite force, and muscle fatigability. We summarize and compare the literatures regarding changes of mandibular function before and after orthognathic surgery. MMO after orthognathic surgery of Class II malocclusion patients was significantly smaller than that of Class III malocclusion patients. The longer the duration of maxillomandibular fixation, the slower the recovery of the MMO. Bite force was positively correlated with occlusal contact and recovered fully 6 months after surgery. The types of orthognathic surgery did not affect bite force significantly.
Hu, Hsiang-Ling; Lin, Sheng-Chin; Wu, Yun-Yun; Tun, Yuan-Yi; Cheng, Man-Ching; Yao, Chung-Chen Jane; and Chang, Wen-Chung
"Bite Force and Maximum Mouth Opening after Orthognathic Surgery,"
Taiwanese Journal of Orthodontics: Vol. 25:
4, Article 2.
Available at: https://www.tjo.org.tw/tjo/vol25/iss4/2