Badel Tomislav, Pandurić Josip, Marotti Marotti, Kern Josipa, Krolo Ivan
Department of Prosthodontics, School of Dental Medicine, University of Zareb, Croatia.
Acta Med Croatica. 2008 Dec;62(5):455-60.
The objective of this study was to investigate the prevalence of anterior disk displacement and condyle position in volunteers free from clinical symptoms and signs of temporomandibular disorders.
Bilateral parasagittal T1-weighted magnetic resonance images of temporomandibular joints (TMJ) in 25 asymptomatic volunteers (age range 21-27, mean 23.4 years; 18 (72%) female and 7 (28%) male) were analyzed and metric measurements of disk and condyle position were investigated. Metric analysis of the position and relationship between the disk and the condyles were described using Kurita et al. method of measuring relative and absolute distances of reference points. On statistical data analysis, the left and right TMJs of each person were presented as two separate entities. The methods of nonparametric statistics were used.
Anterior disk displacement was found in 5 (20%) asymptomatic volunteers (four of them female). Anterior displacement with unilateral reduction and anterior displacement without reduction unilaterally was present in two subjects each, whereas one volunteer had anterior displacement without reduction bilaterally. There was no difference in the calculated position of condyle between joints with and without disk displacement (Kruskal-Wallis test, p < 0.05).
This study evaluated the prevalence of asymptomatic anterior disk displacement in symptom-free healthy volunteers and the condyle position in the glenoid fossa. Displaced disk is the main cause of temporomandibular pain; however, studies in asymptomatic volunteers also suggest it to be an anatomic variant. The relationship between dorsocranially positioned condyle and anteriorly displaced temporomandibular joint disk is a controversial issue. Metric analyses were only made in parasagittal plane.
There was difference in the calculated disk position between joints with and without disk displacement, but this study found no difference in the calculated condyle positions according to the presence or absence of disk displacement.
本研究的目的是调查无颞下颌关节紊乱临床症状和体征的志愿者中关节盘前移位和髁突位置的患病率。
分析了25名无症状志愿者（年龄范围21 - 27岁，平均23.4岁；18名（72%）女性和7名（28%）男性）双侧颞下颌关节（TMJ）的矢状面T1加权磁共振图像，并研究了关节盘和髁突位置的测量指标。使用栗田等人测量参考点相对和绝对距离的方法描述关节盘与髁突之间位置和关系的测量分析。在统计数据分析中，将每个人的左右颞下颌关节作为两个独立的个体呈现。采用非参数统计方法。
在5名（20%）无症状志愿者中发现关节盘前移位（其中4名女性）。两名受试者存在单侧可复性关节盘前移位，两名受试者存在单侧不可复性关节盘前移位，而一名志愿者双侧不可复性关节盘前移位。有关节盘移位和无关节盘移位的关节之间，髁突的计算位置无差异（Kruskal - Wallis检验，p < 0.05）。
本研究评估了无症状健康志愿者中无症状关节盘前移位的患病率以及关节窝内髁突的位置。移位的关节盘是颞下颌疼痛的主要原因；然而，对无症状志愿者的研究也表明其为一种解剖变异。髁突位于背颅侧与颞下颌关节盘向前移位之间的关系是一个有争议的问题。测量分析仅在矢状面进行。
有关节盘移位和无关节盘移位的关节之间，计算出的关节盘位置存在差异，但本研究发现根据关节盘移位的有无，计算出的髁突位置无差异。
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