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Orthodontic Treatment and Temporomandibular Joint Condylar Position Relationship with Disk Displacement (Magnetic Resonance Imaging Study)

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Abstract

Temporomandibular joint (TMJ) is a complex synovial articulation between the mandibular condyle and the glenoid fossa of temporal bone. The question of whether a relationship exists between orthodontic treatment, abnormal condyle and disk position, and temporomandibular disorders has been investigated for many years. Despite the abundance of studies, the question continues to trouble orthodontists.This study conducted to assess the relationship between orthodontic treatments, abnormal condyle and disk position, with temporomandibular disorders, and to study the disk- condyle relationship in term of presence or absence of anterior disk displacement. By mean of Magnetic Resonance Imaging a cross sectional investigation for the condyles of temporomandibular joints (TMJs) and disk position was conducted to 50 TMJs of 25 patients between 19-30 years of age who had undergone orthodontic treatment (by upper and lower fixed orthodontic appliances with extraction of maxillary first premolar only for treatment of class II division 1 malocclusion), and 50 TMJs of 25 patients who had not yet received orthodontic treatment from the same class and matched age group.The results of this study showed that 30% of pre-treatment group have anterior disk displacement in comparison to 26.0% of the post treatment group. The condyle position is more concentric in post treatment group than pre-treatment, and the position of the disk is not affected by orthodontic treatment. This conclude that condyle position of the TMJ may be affected by orthodontic treatment, but the disk position is not.


Article
The Relationship of Tempromandibular joint disorders with Bony Exostosis in the Oral Cavity

Authors: Dr. Thikra I .Hamad. B.D.S., M.Sc. Lecturer د. ذكرى حامد --- Dr. Intisar J .Ismail. B.D.S., M.Sc. Lecturer د. انتصار اسماعيل
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2009 Volume: 6 Issue: 2 Pages: 164-171
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The temporomandibular joint (TMJ) may be affected by inflammatory, traumatic, infectious, congenital, and developmental, as seen in other joints. However, the most common affliction of the TMJ and masticatory apparatus is a group of functional disorders with associated pain that occurs predominantly in women and was previously known as the TMJ pain dysfunction syndrome. Since 1978, there have been substantial changes in the study of etiologic factors, pathophysiology, diagnosis, and management of what are now called temporomandibular disorders (TMD).(1)The general perception that all symptoms in the head, face, and jaw region without an identifiable cause constitute a "TMJ" problem is clearly unfounded.Although some oral lesions, such as torus palatinus and torus mandibularis are normal variants, but require prompt diagnosis and sometime treatment to reduce the potential for serious complication and enhance prosthodontic treatment. The purpose of this study is to inspect the relation of TMJ dysfunction syndrome to the presence of oral exostosis, and find the prevalence of torus palatinus (TP) and torus mandibularis (TM)The sample consisted of 932 teachers, 301 males and 631 females were examined for the presence of TMD, TP and / or TM. Analysis was carried out according to age, gender, TMJ dysfunction and the presence of TP and TM.Results indicated that 123(16.1%) had at least one symptoms of TMD, where as 49 (5.3%) had TP; and 67 (7.2) had TM. The male: female prevalence ratios of TP and TM were 1: 3.42 and 1: 1.81 respectively. The results revealed that significant relationship between TMD and tori, and increase in percentage of mandibular tori with the presence of TMJ dysfunctional syndrome more than maxillary tori were found.TP and TM were more frequent in females and there is significant relation between the TP and TM with presence of TMJ dysfunction syndrome ( P< 0.05 ) especially TM , the presence of TM might be useful to look for sign of dysfunction.(TP),

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