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Changes in disc status in the reducing and nonreducing anterior disc displacement of temporomandibular joint: a longitudinal retrospective study

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ABSTRACT

Treatment procedures for anterior disc displacement (ADD) of temporomandibular joint (TMJ) are far from reaching a consensus. The aim of the study was to evaluate disc status changes of anterior disc displacement with reduction (ADDWR) and without reduction (ADDWoR) comparatively, to get a better understanding of the disease progress without intervention. This longitudinal retrospective study included 217 joints in 165 patients, which were divided into ADDWR group and ADDWoR group based on magnetic resonance imaging (MRI) examination. The joints were assessed quantitatively for disc length and displacement distance at initial and follow-up visits. Disc morphology, which was classified in 5 types, was also evaluated. Paired t-test and Wilcoxon signed rank test were used to assess intra-group differences and independent t-test for inter-group differences. Moreover, analysis of covariance was applied to analyze influential factors for changes in disc length and displacement distance. According to our results, discs tended to become shorter, move further forward and distort more seriously in ADDWoR group than in ADDWR group after follow-up. Moreover, discs were prone to become shorter and more anteriorly displaced in teenagers, type I and III morphologies, advanced Wilkes stages, or those with joint effusion. Follow-up period seemed to be not critical.

No MeSH data available.


Measurement of disc length and displacement distance on MRI.(A) In TMJ MRI image, (B) Schematic diagram.
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f1: Measurement of disc length and displacement distance on MRI.(A) In TMJ MRI image, (B) Schematic diagram.

Mentions: Points A and C were the most anterior and most posterior points of the disc corresponding to the long axis of the condylar head. Point B was the midpoint of the intermediate zone of the disc. Point D was the intersection point where y crossed the condylar outline. Linear measurement was performed for AB and BC, and the summation of these 2 distances was defined as the disc length (Fig. 1). If the disc was obviously deformed and the intermediate zone could not be distinguished, the distance of AC was measured directly. Moreover, the distance of C and D was used to determine the displacement distance relative to the condyle1722.


Changes in disc status in the reducing and nonreducing anterior disc displacement of temporomandibular joint: a longitudinal retrospective study
Measurement of disc length and displacement distance on MRI.(A) In TMJ MRI image, (B) Schematic diagram.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037465&req=5

f1: Measurement of disc length and displacement distance on MRI.(A) In TMJ MRI image, (B) Schematic diagram.
Mentions: Points A and C were the most anterior and most posterior points of the disc corresponding to the long axis of the condylar head. Point B was the midpoint of the intermediate zone of the disc. Point D was the intersection point where y crossed the condylar outline. Linear measurement was performed for AB and BC, and the summation of these 2 distances was defined as the disc length (Fig. 1). If the disc was obviously deformed and the intermediate zone could not be distinguished, the distance of AC was measured directly. Moreover, the distance of C and D was used to determine the displacement distance relative to the condyle1722.

View Article: PubMed Central - PubMed

ABSTRACT

Treatment procedures for anterior disc displacement (ADD) of temporomandibular joint (TMJ) are far from reaching a consensus. The aim of the study was to evaluate disc status changes of anterior disc displacement with reduction (ADDWR) and without reduction (ADDWoR) comparatively, to get a better understanding of the disease progress without intervention. This longitudinal retrospective study included 217 joints in 165 patients, which were divided into ADDWR group and ADDWoR group based on magnetic resonance imaging (MRI) examination. The joints were assessed quantitatively for disc length and displacement distance at initial and follow-up visits. Disc morphology, which was classified in 5 types, was also evaluated. Paired t-test and Wilcoxon signed rank test were used to assess intra-group differences and independent t-test for inter-group differences. Moreover, analysis of covariance was applied to analyze influential factors for changes in disc length and displacement distance. According to our results, discs tended to become shorter, move further forward and distort more seriously in ADDWoR group than in ADDWR group after follow-up. Moreover, discs were prone to become shorter and more anteriorly displaced in teenagers, type I and III morphologies, advanced Wilkes stages, or those with joint effusion. Follow-up period seemed to be not critical.

No MeSH data available.