Materials and Method: A total of 24 heat-polymerized acrylic resin discs (3 mm height, 40 mm diameter) were lined with 2 tissue-conditioners mixed with recommended (Va,Fa) or increased P/L ratios (Vb,Fb). Linear dimensional changes were measured after 2 h of gelation and water storage for 24 and 48 h. Data were analysed using one-way ANOVA (p≤ 0.05).
Results: After 2 h of gelation and water storage of 24 h, linear shrinkage were observed in Va (0,92%, 2,82%) and Fa (1,2%, 2,95%) groups, respectively (p>0,05). After 48 h of water storage, linear shrinkage for Va (0,45%) and linear expansion for Fa (0,66%) were determined (p>0,05). When P/L ratios were increased, linear shrinkage were observed in Vb (1,72%, 1,95%) and Fb (2,12%, 2,24%) groups after 2 h of gelation and water storage for 24 h, respectively (p>0,05). After 48 h of water storage, linear expansion in Vb 0,33% and linear shrinkage in Fb groups were measured (p>0,05).
Conclusion: When dentures are lined with tissue conditioners, mixed with recommended or increased P/L ratios, accurate functional impressions can be taken after a period of 24 h.