45 Translation and validation of the LORQv3 in Dutch 3 Introduction Current research on denture satisfaction mainly focuses on the oral healthrelated quality of life (OHRQoL). Different instruments have been developed for measuring OHRQoL, such as the Oral Health Impact Profile (OHIP)-49 [1] and its shortened version for patients with edentulism OHIP-edent [2]. Although these questionnaires concentrate on the influence of dental/denture problems on quality of life, they miss denture functionality details like mastication, swallowing, speech, esthetics, retention, and pain. It is to be expected that patients with poor adaptation to their dentures report a higher influence of denture problems on quality of life than do satisfied patients. To investigate satisfaction in patients with poor adaptation to their dentures, a questionnaire is needed that contains various detailed aspects of oral function, such as more specific information on the maxillary and mandibular dentures separately and different aspects of esthetics, food intake, pain, and social interaction, and also focuses on OHRQoL. The Liverpool Oral Rehabilitation Questionnaire (LORQ) was developed in 2004 to improve the assessment of issues and problems related to patients undergoing oral rehabilitation after oncologic treatment of the head and neck [3]. After some modifications, version 3 of the LORQ could be used in the clinical setting [4, 5]. The LORQv3 demonstrated satisfactory psychometric properties of acceptability, reliability, and validity. This tool was able to differentiate between cancer and noncancer groups and demonstrated significant correlations between items on the LORQ and in coadministered questionnaires [6]. The high variation among items and the level of detail in this questionnaire make it suitable for assessing denture complaints in patients with poor adaption. Given the significance of identifying and evaluating denture complaints in Dutch patients with denture problems, the objective of this study was to translate and adapt the LORQv3 into a Dutch-language version and to evaluate the internal consistency, reliability, and validity of the resulting LORQv3-NL. The null hypotheses were that the LORQv3-NL would not identify differences between data from patients visiting general practices, patients visiting the university dental clinic, and head and neck oncology patients, and that the LORQv3-NL would not identify differences between test-retest data at an interval of 2 weeks.
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