Quantitative Analysis by MRI on Condylar Motion of the Temporomandibular Joint in Patients Applied with Occlusal Splints.
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Accession number;99A0465492
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| Title;Quantitative Analysis by MRI on Condylar Motion of the Temporomandibular Joint in Patients Applied with Occlusal Splints. |
| Author;
SAITO HIROKI
(Iwate Med. Univ., Sch. of Dent.)
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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.8-19(1999)
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| Figure&Table&Reference;FIG.5, TBL.6, REF.26 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Occlusal splint therapy is a commonly used conservative treatment for internal derangement of temporomandibular joints(TMJs). Among recent imaging techniques to evaluate temporomandibular joint disorders(TMD), MR imaging is most suitable to assess splint therapy. Pseudodynamic MR study may help to confirm recapture of displaced discs after treatment with occlusal splints, but its qualitative nature may limit its application after treatment. The purpose of this study was to assess the feasibility of a newly developed quantitative motion analysis method for the mandibular condyle before and after application of occlusal splints. The subjects were 50 consecutive patients (7 men, 43 women, average 29 years of age,) with internal derangement. Stabilization type splints were applied in 23 cases (46%), anterior repositioning type in 18 cases (36%) and pivot type in 9 cases (18%). All patients underwent MR imaging with a 1.5-TMR unit with a 3-inch dual surface coil. Pseudodynamic MR study of the opening cycle was obtained using multiplanar GRASS sequence(MPGR). Incremental and decremental sagittal MR images before and after splint application were transferred to the workstation. Software originally developed by Nakasato and Katsuragawa was used to analyze the condylar motion and path. After splint application, normalized position of displaced discs was seen in 11 cases (22%), and occurred most frequently with anterior repositioning type splints. In patients with anterior repositioning type splints, improvement in the condylar motion was most significant. In patients with normalized disc position after application of occlusal splints, abnormal "figure-eight-shaped" condylar paths were corrected in 9 of 10 cases. In the case with normalized disc position after application of anterior repositioning splint, the maximum rotational angle before application of the splint is lager than that of the case without normalized disc position.... (author abst.) |
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