Bubble to Material Volume Ratio in Denture Lining Materials

Objectives: Bubbles within the denture lining materials cause stains and reduce the strength of the denture. In this study, the ratio of bubble volume in the denture lining material was compared with that of conventional materials, namely: Mild Rebaron (MR: GC, Japan), Denture Liner (DL: Shofu, Japan), Tokuso Rebase (TR: Tokuyama, Japan), and Rebase II (RII: Tokuyama, Japan). Methods: The test specimens (Five for each material) were 30mm diameter discs, 1mm thick and were tested at room temperature. The bubbles were counted using a digital photograph and their size was calculated by an Image Pro computer software program. The specimens were placed on a microscope and photographed. The volume ratio of the bubbles to material volume was used as the parameter with which to compare the 4 different materials tested. The results were obtained using a One-way ANOVA test (P<0.05). Results: The volume ratios of the bubbles for the different materials were as follows: MR: 1.70 (2.99) > TR: 0.75 (0.71) > DL: 0.73 (0.66) > RII: 0.53 (0.33). The Results showed significant differences between the 4 materials (P<0.05) according to this test. The MR showed a significantly higher ratio of bubble volume to material volume than the other denture lining materials. Conclusion: The ratio of bubble volume to material volume is one important factor to consider regarding denture lining materials. This parameter helps the dentist select the denture lining materials for patients.