Abstract
BackgroundThe purpose of orthognathic surgery is to correct facial deformity and dental malocclusion and to obtain normal orofacial function. However, there are controversies of whether orthognathic surgery might have any negative influence on temporomandibular (TM) joint. The purpose of this study was to evaluate the influence of orthognathic surgery on articular disc position and temporomandibular joint symptoms of skeletal CI II patients by means of magnetic resonance imaging.Material and MethodsFor this purpose, fifteen patients with skeletal CI II malocclusion, aged 19-32 years (mean 23 years), 10 women and 5 men, from the Isfahan Department of Oral and Maxillofacial Surgery were studied. All received LeFort I and bilateral sagittal split osteotomy (BSSO) osteotomies and all patients received pre- and post-surgical orthodontic treatment. Magnetic resonance imaging was performed 1 day preoperatively and 3 month postoperatively. Descriptive statistics and Wilcoxon and Mc-Nemar tests were used for statistical analysis. P<0.05 was considered significant.ResultsDisc position ranged between 4.25 and 8.09 prior to surgery (mean=5.74±1.21). After surgery disc position range was 4.36 to 7.40 (mean=5.65±1.06). Statistical analysis proved that although TM disc tended to move anteriorly after BSSO surgery, this difference was not statistically significant (p value<0.05).ConclusionsThe findings of the present study revealed that orthognathic surgery does not alter the disc and condyle relationship. Therefore, it has minimal effects on intact and functional TM joint. Key words:Orthognathic surgery, skeletal class 2, magnetic resonance imaging, temporomandibular disc.
Highlights
An important issue in the orthognathic surgery is its effects on temporomandibular (TM) joint
Determination of condylar position in relation to TM disc is of utmost importance as changes in the condyle-disc complex position can result in complications, malfunction and delayed relapse of orthognathic treatments in achievement of a successful orthognathic surgery, maxillofacial surgeons mainly rely on patient satisfaction from esthetic aspect
As changes in TM disc position can exacerbate or improve symptoms in the TM joint, the purpose of this study was to determine and compare the position of the articular disc before and after orthognathic surgery in skeletal class 2 patients and to assess whether orthognathic surgery leaded to changes in TM disc position
Summary
An important issue in the orthognathic surgery is its effects on temporomandibular (TM) joint. A study carried out on 25 patients requiring orthognathic surgery for correction of skeletal class 3 deformity reported that clinical and MRI examinations revealed correction of articular disc position after surgery [5]. As changes in TM disc position can exacerbate or improve symptoms in the TM joint, the purpose of this study was to determine and compare the position of the articular disc before and after orthognathic surgery in skeletal class 2 patients and to assess whether orthognathic surgery leaded to changes in TM disc position. The purpose of this study was to evaluate the influence of orthognathic surgery on articular disc position and temporomandibular joint symptoms of skeletal CI II patients by means of magnetic resonance imaging. Conclusions: The findings of the present study revealed that orthognathic surgery does not alter the disc and condyle relationship It has minimal effects on intact and functional TM joint
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