The role of occlusion in temporomandibular disorders (TMD) in the Northern Finland Birth Cohort (NFBC) 1966

Zhang

European J Oral Sciences

et al. 2018

Unilateral anterior crossbite (UAC) has been demonstrated to cause masseter hyperactivity via the periodontal trigeminal mesencephalic nucleus (Vme)–trigeminal motor nucleus circuit. Here, we studied activation of motor neurons of the facial nucleus (VII), hypoglossal nucleus (XII), nucleus ambiguus (Amb), and spinal nucleus of the accessory nerve (SNA) in rats with UAC via their similar connections with Vme. An anterograde tracer, biotinylated dextran amine (BDA), was injected into the Vme to identify the central axon terminals around the motor neurons of VII, XII, Amb, and SNA. The expression of vesicular glutamate transporter 1 (VGLUT1) in neurons of VII, XII, Amb, and SNA, and the expression of acetylcholinesterase (AChE) were measured in the stapedius, lingualis, palatopharyngeal, and sternocleidomastoid muscles. In BDA‐treated rats, many BDA‐labeled cell bodies in the Vme and terminals in VII, XII, Amb, and SNA were identified. Compared with control rats, rats with UAC showed higher expression of VGLUT1 in these nuclei, and statistically significantly higher expression of AChE in the stapedius, lingualis, and sternocleidomastoid muscles, but not in the palatopharyngeal muscle. These findings suggest that UAC activates orofacial, head, and cervical multimotor behaviors via connections between the Vme and the corresponding motor nuclei.

Section: Discussionmentioning

confidence: 99%

Dental malocclusion stimulates neuromuscular circuits associated with temporomandibular disorders

Zhang

European J Oral Sciences

et al. 2018

The Journal of Contemporary Dental Practice

“…53 The literature also illustrates how such transverse occlusal discrepancies would impact muscular condition and function. Jussila et al 54 demonstrated association between myalgia and lateral scissor bite.…”

Section: Discussionmentioning

confidence: 99%

Occurrence of Malocclusion in Patients with Orofacial Pain and Temporomandibular Disorders

Bindayel

2018

Cukurova Medical Journal

“…The features occurring more frequently in patients with temporomandibular disease than healthy individuals can be pronounced overjet, skeletal anterior open-bite, early contact or lateral deviation during jaw closure, loss of molar support and trabecular structure changes in the joint area bones. Occlusal condition may cause temporomandibular disorder symptoms by affecting mandibular functions as a result of mandible instability and acute changes in occlusal relationships 17 . Relationships between teeth and malocclusions have been found to be associated with temporomandibular disorders 12 .…”

Section: Discussionmentioning

confidence: 99%

Farklı maloklüzyon gruplarında ortodontik tedavinin mandibular kondil kemik kalitesine etkisi

Ertuğrul¹

2021

The aim of this study was to investigate the effects of orthodontic treatment on the mandibular condyle head bone formation according to different orthodontic malocclusion groups. Materials and Methods: In the study, forty-eight patients were examined. Individuals included in the study were grouped according to malocclusion groups. Our study was carried out retrospectively. The quality of mandibular condyle bone in panoramic images of patients before and after orthodontic treatment were compared retrospectively. This examination was carried out by a fractal analysis method. Results: According to the findings we obtained from our study; the change in mandibular condyle bone quality before and after orthodontic treatment by age and gender was not found to be statistically different. After orthodontic treatment in individuals with Class I and III malocclusions, the trabecular density structure of the mandibular condyle bone increased and decreased in individuals with Class II malocclusion. The change in mandibular condyle bone quality before and after orthodontic treatment by malocclusion groups was found to be statistically different. Conclusion:The fractal analysis method is a technique that facilitates the diagnosis of minimal changes occurring on the radiographs of orthodontic treatment patients and to evaluate the prognosis of the disease. A relationship was found between orthodontic treatment applied to different malocclusion groups and mandibular condyle head bone formation. When evaluating orthodontic treatments, mandibular condyle head bone formation should be taken into consideration. Amaç: Bu çalışmada, ortodontik tedavinin mandibular kondil başı kemik oluşumu üzerine etkilerinin farklı ortodontik maloklüzyon gruplarına göre araştırılması amaçlanmıştır. Gereç ve Yöntem: Çalışmada kırk sekiz hasta incelendi. Çalışmaya dahil edilen kişiler maloklüzyon gruplarına göre gruplandırıldı. Çalışmamız geriye dönük olarak yapıldı. Hastaların ortodontik tedavi öncesi ve sonrası panoramik görüntülerinde çene kondil kemiğinin kalitesi retrospektif olarak karşılaştırıldı. Bu inceleme fraktal analiz yöntemi ile yapılmıştır. Bulgular: Çalışmamızdan elde ettiğimiz bulgulara göre; yaşa ve cinsiyete göre ortodontik tedavi öncesi ve sonrasında mandibular kondil kemik kalitesindeki değişim istatistiksel olarak farklı bulunmadı. Sınıf I ve III maloklüzyonlu bireylerde ortodontik tedavi sonrası mandibular kondil kemiğinin trabeküler yapısında densite azalması olmuştur. Sınıf II maloklüzyonlu bireylerde mandibular kondil kemiğinin trabeküler yapısı densite artması olmuştur. Maloklüzyon gruplarına göre ortodontik tedavi öncesi ve sonrası mandibular kondil kemik kalitesindeki değişim istatistiksel olarak farklı bulundu. Sonuç: Fraktal analiz yöntemi, ortodontik tedavi gören hastaların radyografilerinde oluşan minimal değişikliklerin teşhisini kolaylaştıran ve hastalığın seyrini değerlendiren bir tekniktir. Farklı maloklüzyon gruplarına uygulanan ortodontik tedavi ile mandibular kondil başı kemik oluşumu arasında ilişki bulunabilece...