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Music --- oude muziek --- Matelart, Johannes

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Introduction: This study aims to find a standardized method to describe the changes in the arch perimeter, so it could be added to the protocol of the expansion study. The previous study aimed to investigate the effect of interceptive orthodontics on the dental arch characteristics after slow maxillary expansion. No method to determine the arch perimeter has been added yet to the existing protocol. Material and method: A literature review was conducted for a standardized method to determine the arch perimeter before and after expansion. Furthermore, the influence of the inclination of the upper incisors on the arch perimeter was investigated through a literature review to determine whether this should be taken into account for a standardized method for measuring the arch perimeter. These findings were gained by measuring the difference of the arch perimeter and the inclination of the upper incisors before and after treatment. Pearson’s correlation was used to check whether there is a correlation present with the help of SPSS statistics. The test group consists of 9 individuals who had a cervical headgear as treatment to distalize the molars, so the incisors have the chance to change the inclination. Results: Fifteen different methods were found to determine the arch perimeter. These were just an estimation of the arch perimeter and did not take into account the different criteria which could have an influence on the arch perimeter. Only 7 relevant articles about the relationship between the inclination and the arch perimeter were found, they were all unreliable. The control measurements showed no correlation between the change of the arch perimeter and the change of the inclination. This result was not significant due to the small sample size. Conclusion: It can be concluded that no standardized method exists. So, it is not possible to add one to the protocol of the expansion study. The research for the effect of the inclination of the upper incisors on the arch perimeter shows no reliable results.

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Introduction: End-stage temporomandibular joint (TMJ) disease is associated with significant morbidity and reduction in quality of life (QoL). In recent years, TMJ replacement surgery with alloplastic prosthesis has gained popularity as an effective approach for this selected patient group. Although initial data show favourable functional results, there is a lack of prospective data and subjective outcomes. The purpose of this study is to assess functional outcomes and patient- reported QoL after TMJ replacement surgery with a custom-made alloplastic prosthesis. Methods: Three questionnaires and a visual-analogue scale were used to assess patient-reported subjective outcomes and QoL in a prospective study. Furthermore, clinical data regarding jaw function were assessed as well. Results: Six patients (6 females, 0 males) with a mean age at time of surgery of 48.2±14.7 years (range 25-60 years) were included in this study. Five patients received a unilateral alloplastic prosthesis and 1 patient underwent bilateral joint replacement surgery. Significant improvements were found for pain (VAS-score) (p=0.0227), maximum interincisal opening (p=0.0098) and eating (p=0.0261) after TMJ replacement surgery. Furthermore, significant improvements were found for stress levels (p=0.0059), sleep quality (p=0.0125) and the ability to perform daily activities (p=0.0099). In addition, patients reported less discomfort due to pain postoperatively (p=0.0003) and an improved TMJ-related QoL (p=0.0312) and overall QoL (p=0.0125). Conclusion: In conclusion, TMJ replacement surgery with a custom-made alloplastic prosthesis is a safe and effective approach for patients with end-stage TMJ-disease. In addition to improved objective clinical outcomes, patient-reported subjective measurements and QoL seem to improve as well after TMJ replacement surgery.