[The effect of form of alveolar ridge on relining of complete dentures]

To evaluate the effect of relining on complete dentures by analysis of model measurement.

15 edentulous mandibular models were fabricated by close mouth impression, these models were marked and cut at 5 different positions, the alveolar height, width and sectional area were measured, then direct relining was performed on these patients' lower denture (Tokuyama Rebase Fast II). The cases were followed up for 7 days. Satisfaction questionnaire was used to evaluate the effect before and after relining. The results of relationship between alveolar ridge and effect of relining on complete dentures were analyzed with SPSS15.0 software package.

There was significant correlation between the retention of lower complete dentures and the ridge form of alveolar at premolar area (P<0.01); The sectional area of alveolar ridge had the most significant correlation with the level of retention (P<0.01), and the effect of buccal side was more significant than that of lingual side. There was a correlation between the width of the alveolar ridge and retention; The buccal sectional area appeared to be more effective prognostic aid to retention. The logistic equation derived from model measurement could be used to predict the effectiveness of complete denture relining with an accuracy rate approaching 70%.

The dimensions of alveolar ridge at premolar area is most correlative with the retention of lower dentures after relining. Model measurement can be used as an accurate method to predict the effectiveness of relining for patients wearing complete dentures.