牙咬合测量尺的设计及在颞下颌关节MRI扫描中的应用

Design of the dental occlusion measuring ruler and its application in MRI scanning of temporomandibular joint

目的提高颞下颌关节紊乱征患者磁共振成像(MRI)检查图像质量。方法将颞下颌关节紊乱征患者158例随机分为观察组(n=73)及对照组(n=85)。两组均采用超导磁共振仪行颞颌关节T2WI扫描,张口位检查时,观察组采用自行设计的牙咬合测量尺固定上下门齿,对照组按常规采用无菌纱布固定上下门齿。比较两组扫描前与扫描时张口位固定上下门齿间距最大开口度测量值、一次扫描成功率、扫描时间、患者舒适度情况。结果观察组扫描前与扫描时张口位最大开口度测量值比较,差异无统计学意义(P>0.05),而对照组差异有统计学意义(P<0.05);观察组一次扫描成功率(97.26%)显著高于对照组(77.65%),扫描时间[(364.48±49.43)s]显著短于对照组[(403.93±138.63)s],两组比较,差异有统计学意义(P<0.05,P<0.01);两组舒适度比较,差异无统计学意义(P>0.05)。结论自行设计制作的牙咬合测量尺用于颞下颌关节紊乱征患者MRI检查,能保证最大开口度精准测量,有效固定门齿,提高一次扫描成功率,缩短扫描时间。

Objective To improve the image quality of magnetic resonance imaging(MRI)in patients with temporomandibular joint disorders.Methods A total of 158 patients with temporomandibular joint disorder were randomized into an intervention group(n=73)and a control group(n=85).Both groups were scanned for temporomandibular joints using superconducting MRI apparatus of T2WI sequences,in the mouth opened position,the self-designed dental occlusion measuring ruler was used for the intervention group to fix the upper and lower incisors,while sterile gauzes were routinely used in the control group.The maximum opening degree,one-time scanning success rate,scanning time and patient comfort before and during scanning were compared between the two groups.Results There was no significant difference in the maximum opening degree before and during scanning in the intervention group(P>0.05),while it was significantly different in the control group(P<0.05).The one-time scanning success rate of the intervention group was significantly higher than that of the control group(97.26%vs.77.65%),and the scan time of the intervention group was significantly shorter than that of the control group[(364.48±49.43)s vs.(403.93±138.63)s](P<0.05,P<0.01).There was no significant difference in comfort level between the two groups(P>0.05).Conclusion Application of the self-designed dental occlusion measuring ruler in MRI scan of temporomandibular joint can accurately measure maximum opening degree of patients,effectively fix incisors,improve success rate of one-time scanning and shorten scanning time.