Radke John C, Kamyszek Greg J, Kull Robert S, Velasco Gerardo R
a BioResearch Associates, Inc. , Milwaukee , WI , USA.
b Western NY TMD and OFP Clinic , W. Seneca , NY , USA.
Cranio. 2019 Jan;37(1):12-19. doi: 10.1080/08869634.2017.1365421. Epub 2017 Sep 4.
The null hypothesis was that mandibular amplitude, velocity, and variability during gum chewing are not altered in subjects with temporomandibular joint (TMJ) internal derangements (ID).
Thirty symptomatic subjects with confirmed ID consented to chew gum on their left and right sides while being tracked by an incisor-point jaw tracker. A gender and age matched control group (p > 0.67) volunteered to be likewise recorded. Student's t-test compared the ID group's mean values to the control group.
The control group opened wider (p < 0.05) and chewed faster (p < 0.05) than the ID group. The mean cycle time of the ID group (0.929 s) was longer than the control group (0.751 s; p < 0.05) and more variable (p < 0.05).
The ID group exhibited reduced amplitude and velocity but increased variability during chewing. The null hypothesis was rejected. Further study of adaptation to ID by patients should be pursued.
无效假设为颞下颌关节（TMJ）内紊乱（ID）患者在咀嚼口香糖时下颌的幅度、速度和变异性未发生改变。
30名确诊为ID的有症状受试者同意在使用切牙点颌追踪器进行追踪的同时，分别用左右两侧咀嚼口香糖。一个性别和年龄匹配的对照组（p>0.67）自愿接受同样的记录。采用学生t检验将ID组的平均值与对照组进行比较。
对照组比ID组张口更大（p<0.05）且咀嚼速度更快（p<0.05）。ID组的平均周期时间（0.929秒）比对照组（0.751秒；p<0.05）更长且变异性更大（p<0.05）。
ID组在咀嚼过程中表现出幅度和速度降低，但变异性增加。无效假设被拒绝。应进一步研究患者对ID的适应性。
