Abstract
ObjectiveThis study assessed the test‐retest reproducibility of the Utrecht mixing ability test (MAT) and the construct validity of the MAT in relation to the Mandibular Function Impairment Questionnaire (MFIQ) in patients with mandibular condylar fractures.Material and methodsTwenty‐six patients treated for a mandibular condylar fracture participated in this clinimetric study; all patients performed the MAT twice. Simultaneously the MFIQ was conducted. Test‐retest reliability and construct validity were assessed using the intra‐class correlation coefficient (ICC) and Spearman correlation, respectively.ResultsThe ICC of the MAT was 0.906 (95% CI: 0.801‐0.957), which indicates an excellent reliability. A weak correlation of 0.386 (P = .052) between the first MAT and the overall outcome of the MFIQ was found. A significant moderate correlation of 0.401 (P = .042) was found between the retest of the MAT and the overall outcome of the MFIQ. One question on the MFIQ (about yawning) showed a moderate positive correlation of 0.569 (P = .002) and 0.416 (P = .034) for the MAT test and retest, respectively.ConclusionThe MAT is an easy test to use in follow‐up of patients. The test‐retest reliability of this test is excellent in condylar trauma patients. As the validity of the MAT and the MFIQ could not be confirmed, the MFIQ may be an addition to patient's feedback about the rehabilitation process of their mandibular functioning.
Highlights
After a maxillofacial injury, patients frequently have problems with eating food (67%) and have to change their diet (55%) due to decreased masticatory functioning.[1]
The results of the standard deviation (SD), standard error of measurements (SEM), smallest detectable change (SDC) and a Bland-Altman plot with corresponding Limits of agreement (LoA) can be found in Table 2 and Figure 1
This study focused on the test-retest reproducibility and construct validity of the mixing ability test (MAT) in patients with mandibular condylar fractures
Summary
Patients frequently have problems with eating food (67%) and have to change their diet (55%) due to decreased masticatory functioning.[1]. Masticatory performance is the objective efficiency of this mastication process, which can be measured by different methods (fi comminution or mixing ability methods).[9] The Utrecht mixing ability test (MAT) with two-coloured wax was described as a reliable test for patients with cerebral palsy syndrome.[10] For patients with mandibular trauma, such as condylar fracture, the reproducibility and validity of this test have not yet been investigated.[2,9]. Masticatory ability is the subjective testing of the mastication process, which reflects the expectations of the patients and their quality of life by taking the psychological and emotional adjustment of the patient in their daily life into account. This can be an advantage over measurement of objective outcomes alone. We hypothesise that the reproducibility of the MAT will be sufficient (ICC ≥ 0.7) and that the construct validity would be at least moderately correlated (≥ 0.60)
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