MR Image Assessment of Disc Configuration and Degree of Anterior Disc Displacement in Internal Derangement related to Age.
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Accession number;99A0465493
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| Title;MR Image Assessment of Disc Configuration and Degree of Anterior Disc Displacement in Internal Derangement related to Age. |
| Author;
IGARASHI CHINAMI
(Turumi Univ., Sch. of Dent. Med.)
KOBAYASHI KAORU
(Turumi Univ., Sch. of Dent. Med.)
YUASA MASAO
(Turumi Univ., Sch. of Dent. Med.)
IMANAKA MASAHIRO
(Turumi Univ., Sch. of Dent. Med.)
YAMAMOTO AKIRA
(Turumi Univ., Sch. of Dent. Med.)
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Journal Title;Dental Radiology
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Journal Code:Z0608B
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ISSN:0389-9705
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VOL.39;NO.1;PAGE.20-26(1999)
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| Figure&Table&Reference;FIG.1, TBL.7, REF.24 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;This study was designed to evaluate the configuration of the articular disc and degree of anterior disc displacement on magnetic resonance(MR) imagings in temporomandibular joints(TMJs) with internal derangement. A total of 363 joints diagnosed as having anterior disc displacement with reduction(ADDwR) and 523 joints diagnosed as having anterior disc displacement without reduction(ADDwoR) by MR imaging were examined. These joints did not show severe osseous changes on the condylar head or glenoid fossa. We assessed the configuration of the articular disc and degree of anterior disc displacement. In the ADDwR group, 82.6% of the articular discs showed biconcave configuration; enlargement of the posterior band in 4.6%, biconvex configuration in 0.5%, and others in 10.7%. Moreover 62.5% of the discs showed a slight degree of anterior disc displacement; were 27.2% moderately displaced and were 10.2% severe displaced. The prevalence of slightly displaced discs was higher in the TMJs of cases over 50 years of age than in cases under 30 years in the ADDwR group. On the other hand, in the ADDwoR group 35.9% of the articular discs showed biconcave configuration; enlargement of the posterior band in 12.6%, biconvex configuration in 25.4%, and others in 22.3%. Furthermore, 4.4% of the discs were slightly displaced; 43.9% moderately displaced and 51.6% were severely displaced. The prevalence of severely displaced and deformed discs in joints of cases over 40 years of age was high in the ADDwoR group. The prevalence of slightly displaced biconcave discs was higher in the ADDwR group. The other hand, the prevalence of severely displaced deformed discs was higher in the ADDwoR group. MR findings of internal derangement of the TMJ were found to be significantly correlated with age. (author abst.) |
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