The aim of the study was to assess patients' socio-demographic factors with their removable prosthesis in general, as well as to assess their problems with the functional limitation, physical pain, psychological discomfort, physical disability, social disability, and handicap investigate impaired oral health-related quality of life (OHRQoL) in patient treated with removable dentures before treatment and at 1 and 12 months after treatment. The first part of the questionnaire was comprised of 20 questions. It was designed in four different sections as: (i) general socio-demographic factors, (ii) general health, (iii) experience and use of dental and denture care, and (iv) anamnestic sign and symptoms of temporomandibular disorders (TMD). A statistical analysis system (SAS) was used for data management and analysis. Patient-reported problems were studied using the item list contained in the Turkish version of the oral health impact profile (OHIP) in a convenience sample of 136 prosthodontic patients before (m(0)), 1 month after (m(1)), and 12 months (m(2)) after treatment were then examined by using two-way ANOVA with repeated measurement. Differences in OHRQoL were present when item-specific prevalence was stratified by time of total scores; gender, residential area, working status, self-reported general health, smoking status, denture type, importance of the convenient dental care, trauma story, self-reported TMD/pain, and self-reported TMD/difficulty opening mouth wide. At baseline, the most prevalent frequently reported problems "difficulties chewing'' (49.3%), "digestion worse'' (40.4%), "take longer to complete a meal'' (36%), "food catching'' (30.9%), and "dentures not fitting'' (29.4%), and m2 the most prevalent frequently reported problems were "avoid going out'' (25%), "difficulties chewing'' (17.6), "sore jaw'' (15.5%), and "take longer to complete a meal'' (14%). The study confirmed that denture status is by far the strongest predictor of impaired OHRQoL compared to socio-demographic factors. Subjects with strong or moderate values had significantly fewer oral health-related problems (OHIP-extent) of time of total scores. The number of problems decreased substantially after prosthodontic treatment. The profile of pretreatment and post-treatment problems differed substantially, but in general, only a few problems remained after adaptation to new dentures. (C) 2010 Elsevier Ireland Ltd. All rights reserved.