Determining the vertical dimension of occlusion is a critical procedure for a totally or partially edentulous patient. Many edentulous patients have adapted to a vertical dimension which has decreased due to bone resorption and posterior tooth wear. Restoring the proper vertical dimension is further complicated because the rest position may be subject to change. Swerdlow found that the vertical dimension of rest varies after natural tooth contacts are lost. Also, the rest vertical dimension can undergo a reduction comparable to the loss of occlusal vertical dimension 
. It is believed that an increase of the OVD may elicit masticatory disorders, and in edentulous patients accelerate bone resorption and cause denture soreness because of increased pressure on the denture-bearing tissues 
. McGee found that patients tend to register a reduced vertical dimension of occlusion because they feel more comfortable in this position 
Purpose: This study aim to evaluate the satisfaction level in conventional complete dentures patients after reducing the vertical dimension of occlusion.
Material and Methods: Fifteen completely edentulous subjects, their ages were between (39 - 66) years, the mean age of the subjects was 50 years. For each subject, one maxillary complete denture and two mandibular complete dentures were made. The first denture was made with appropriate occlusal vertical dimension (OVD), while the second denture was reduced by 3 mm less than the appropriate occlusal vertical dimension (OVD) of the first denture.
A questionnaire was used to evaluate the results of this study through the use of the visual analyses scale (VAS).
Results: The average of satisfaction level for suitable OVD was (58.66), in reduced OVD was (67.33)/ VAS.
. There was a significant differences in the satisfaction level between suitable OVD and reduced OVD
. Patients were more comfortable by using dentures with reduced occlusal vertical dimension.