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KMID : 1813120180030020017
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Journal of Sleep and Dental Medicine
2018 Volume.3 No. 2 p.17 ~ p.25
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The reliability of 4D sonographic method in measuring the range of mandibular condylar movement
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Kim Jin-Woo
Oh Se-Youn
Kim Sun-Jong
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Abstract
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A 4D sonographic measurement method was developed to assess mandibular condylar movements. The aim of this study was to evaluate the clinical feasibility and reliability of 4D sonography for condylar movements. Condylar movements in 20 subjects were recorded using a 4D linear transducer with a Voluson E8 scanner while each participant was asked to sequentially) move the jaw from the intercuspal position(ICP) to the maximum open position(MOP) and then the maximum protrusive position(MPP). The straight-line distances(LDs) of the condyle from the ICP to the MOP and to the MPP were measured twice by a single examiner 2 weeks apart, and once by another examiner. The reliability of the measurements was assessed using the intra-class correlation coefficient(ICC) and the 95% limits of agreement(LoA). The average LDs of the condyle from the ICP to the MOP and to the MPP were 15.1±1.6 and 8.4±1.3mm, respectively. The sonographic measurements showed very good reliability. The ICCs for intra-examiner and inter-examiner reliability were all above 0.96. The 95% LoA for intra-examiner and inter-examiner differences were small(with values ranging from ?0.62 to 0.52mm and from ?0.69 to 0.63mm, respectively). The results suggest that 4D sonography might be a valuable tool for assessing mandibular condylar movement.
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