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Introduction: The denture base is the part of the removable denture that is supported by good adaptation to the underlying oral tissue. Most of the denture bases are made of acrylic or polymethyl methacrylate resin, better known as PMMA. However, the acrylic resin also has disadvantages such as easily broken and absorbs liquids both water and chemicals. The chemical absorption like alcohol, ethanol, and some drinks that contain acidic materials will chemically be induced with acrylic resin and settle in the pores of the acrylic resin. The chemical damage or defect creates roughness on the surface of the acrylic resin which can cause cracking or crazing and a decrease in surface strength and hardness. Materials and Methods: The method used in this research was a laboratory experimental design with a post-test-only control group using 12 samples consisting of 2 different types of samples by measuring the surface roughness of the acrylic resin after immersing the sample with a predetermined time. Results and Discussions: One-way ANOVA test results showed a significant difference in surface roughness after the samples immersion with a value of p = 0.006 (p <0.05). Conclusions: Based on this research, can be concluded that there is an increase in the surface roughness of the heated polymerized acrylic resin for 3 hours and 4 hours of immersion. The longer the heated polymerized acrylic resin is soaked in arak hence the level of surface roughness increases.

Dental material that is often used in dentistry is alginate. Alginate molding material has imbibition properties that absorb water when it comes into contact with water so that the shape is easier to expand and syneresis is the loss of water content through evaporation, causing shrinkage of the alginate mold when left too long in the open air. It is recommended that the printed product be disinfected first to avoid cross infection. One of the herbs that has antibacterial properties is noni. The purpose of this study was to determine differences in immersion and spraying techniques with 0.5% sodium hypochlorite and noni extract 50%, 25% and 12% for 5 minutes. Data were analyzed by ANOVA test. The conclusion of this study is that there is a change in the stability of the dimensions of the alginate mold in the AB (anteroposterior) and BC distance inter junction techniques, at concentrations of 12% and 25%, experiencing a higher increase compared to the concentration of 50% but still within the clinical tolerance limit ie below 0.5%. The spraying technique has a smaller percentage change compared to the immersion technique. There is a change in dimensional stability of alginate molds with a significant difference in the immersion and spraying technique, soaking causes an increase indimensional changes compared to the spraying technique.

Accumulation of plaque and food scraps on an acrylic resin base will increase bacterial colonies and C. albicans which will cause denture stomatitis. Maintenance of denture hygiene using mechanical, chemical and combination of two methods. Basil leaf extract contain essential oils which are important in fight against resistant C. albicans biofilms. The purpose of this study was to determine the comparison of C. albicans colonies after cleaning various denture cleaning methods. The method of this study is used an experimental method, the study design is posttest only with control group design. Sample size of heat-cured acrylic resin plate is 40x12x3mm. this study use Kruskall-Wallis test and Mann-Whitney test as data analysis for comparison tests between groups (non-parametric test). The results showed that there were significant differences between the various cleansing methods used in reducing C. albicans colonies. The compotition of flavonoids basil leaf extract is anti-microbial which can prevent the entry of fungi that harm the body.