Recovery of mandibular mobility following orthognathic surgery

A hypothesis on the desired postoperative position of the condyle in orthognathic surgery: a review

“…Aragon et al 91 reported that protrusive movement and lateral excursion of the mandible did not recover to the preoperative levels after a sagittal split osteotomy was performed to advance the mandible. Boyd et al 92 These studies suggested that changing the condylar position could improve TMJ function after IVRO. If accurate condylar repositioning in SSRO is performed on the deviation side of the mandibular asymmetry with a TMJ that has an anteriorly displaced disc, improvement in TMJ function will not be expected.…”

Assessment of the Relationship Between the Recovery of Maximum Mandibular Opening and the Maxillomandibular Fixation Period After Orthognathic Surgery

“…In a previous study by Boyd et al 8 a significant reduction in MMO occurred immediately after surgery in the Le Fort I osteotomy and SSRO groups and at lease of fixation in the IVRO group. They stated that significant differences in the recovery patterns of mandibular mobility exist between surgical procedures.…”

“…This study demonstrated that there were no significant differences among the four patient groups, suggesting that the addition of Le Fort I osteotomy does not affect the recovery of MMO, as mentioned previously. 8 Previous studies indicate that intrinsic differences exist between SSRO and IVRO patients when dental fixation is used without physiotherapy, with IVRO patients recovering a larger percentage of their preoperative MMO. 3,4 It was considered that the difference in the recovery of MMO between the SSRO and IVRO groups depended on the period of MMF after surgery.…”

“…Several investigators have reported alterations in mandibular mobility following orthognathic surgery. [1][2][3][4][5][6][7][8] This can occur to a greater or lesser extent following mandibular and maxillary surgery. 4,6 Methods including intra-operative fixation of bony segments, postoperative intermaxillary fixation, and myotomy of the suprahyoid musculature may influence the degree of hypomobility.…”

“…MMO measurement is easier to understand and it can show statistical differences more readily than protrusive and lateral excursion measurements. 8 However, there were no reports that statistically evaluate the relationship between the recovery of MMO and the MMF period after orthognathic surgery. Although it is very important to understand the recovery of MMO after different orthognathic procedures, there is still no evidence to suggest whether particular surgical procedures and the MMF period affect the recovery of the MMO.…”