238 Chapter 8 The above study has shown that the available general QoL questionnaires, such as the EORTC QLQ-C30 and QLQ-H&N35, do not capture details of prosthetic functionality such as chewing, swallowing, speaking, aesthetics, retention, and pain to measure the effects of prosthetic treatment. The Liverpool Oral Rehabilitation Questionnaire (LORQ) had shown better discriminatory power. Until then, no validated Dutch version of the LORQv3 was available. Therefore, the aim of Chapter 3 was to translate and adapt the LORQv3 into Dutch and to assess the internal consistency, reliability, and validity of the resulting LORQv3-NL. The original English LORQv3 was translated into Dutch using the forwardbackward approach. The internal consistency of the LORQv3-NL was tested in 158 participants from the Radboudumc Faculty of Dentistry, the Center for Special Oral Care of Radboudumc and Maastricht UMC+ and in general practices. Testretest reliability was performed in 34 of these 158 patients. For convergent validity, the correlation between the LORQv3-NL and the OHIP-NL14 was examined in 17 of the 158 patients. Internal consistency (Cronbach’s α = 0.89 for items 1-17), test-retest reliability (weighted kappa values of 0.401 to 0.830 for items 1-17), and convergent validity (R2 = 0.642) were satisfactory. The LORQv3-NL appeared to be a good instrument for assessing denture satisfaction and perceived fit. One of the most difficult prosthetic treatments is rehabilitating a patient with a maxillary defect due to tumour resection or trauma, for example. With a maxillary defect, oronasal separation is lost, allowing air, fluid, and often even food to escape. This impairs functions such as eating, swallowing and speaking, and thus has a significant impact on social well-being and QoL. Prosthetic treatment aims to restore the nasal-oral separation as well as possible and replace the missing teeth. Traditionally, this is done with an obturator prosthesis, in which retention is sought on the remaining teeth. This hold is more difficult to find when there are no natural teeth left. As in the mandible, implants can also be considered in the maxilla. In Chapter 4 we investigated whether implant-retainment actually leads to functional improvement and a better QoL. In the first cross-sectional study (Chapter 4.1), we compared masticatory performance and oral health-related QoL of edentulous patients with obturator prostheses with or without implants. In 19 edentulous patients with a (partial) maxillectomy whose prosthetic treatment had been completed, masticatory performance was measured objectively and three questionnaires were completed. Masticatory performance was measured by the mixing ability
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