Validation of an Instrument to Determine the Level of Satisfaction of Patients Rehabilitated with Removable Prosthesis

The survey is an element of health data collection. The validity of the questionnaire is essential to achieve useful evidence, being a crucial aspect in identifying and correcting sources of bias during data collection. Verbal and cognitive tests are recognized as a tool to assess whether questions cause problems for both, the interviewer and the interviewee. The aim of this study was to validate the OHIP-49 and OHIP-19 instruments in a sample of Costa Ricans applying cognitive tests such as probing and thinkalouds and then a standard pretest. In a sample of 15 individuals rehabilitated with dentures a questionnaire of 42 items was applied that served as a cognitive test. Also 20 individuals performed a standard pretest using the telephone. The validation of this instrument served to determine the final sample for a further investigation and also to collect information about the duration of the survey as well as its comprehension.