Patients' satisfaction in two long-term clinical studies on resin-bonded bridges.

This study aimed to evaluate patients' satisfaction with resin-bonded bridges and the effect of failures on the degree of satisfaction. In two clinical trials, 358 patients completed guided questionnaires at regular recalls (n=1484). In this way, data regarding 'overall function', 'colour', 'shape', 'functional changes', 'complaints' and 'recommendation to other patients' were obtained. The scores of each criterion were evaluated for the variables 'trial', 'gender', 'time after placement' and 'failure', using 4-way ANOVA. Encountered failures were rated using a 'failure severity scale'. For all combinations of measurement periods, the changes in patient's opinions were calculated and the differences tested using the paired t-test. Overall satisfaction was correlated with 'colour', 'shape' and inversely correlated with 'complaints' (r>0.34; all P<0.005). No statistical differences were found between males and females. No significant changes were observed in patient satisfaction over time. Failures influenced the failure sensitive variables 'functional changes' and 'avoidance of load'. The z-scores were independent of the severity of the failures (r<0.13; all P>0. 10). The degree of patient satisfaction with resin-bonded bridges appeared to be high and did not seem to be influenced by the occurrence of failure.