BACKGROUND Heat-polymerized acrylic resins are commonly used as denture base, but they have relatively low mechanical properties such as impact strength, transverse strength, and modulus of elasticity that made them susceptible to fracture during clinical application. Various modifications were made to improve the mechanical properties of heat-polymerized acrylic resins, one of them was with the addition of E-glass fiber. We wanted to determine the effect of E-glass fiber (chopped strands of 3 mm size) with 1% and 1.5% weight concentration addition on mechanical properties (impact strength, transverse strength, and modulus of elasticity) of heatpolymerized acrylic resin denture base material and the correlation between them. MATERIALS AND METHODS Ninety samples of heat-polymerized acrylic resin were divided into 9 groups, consisting of impact strength, transverse strength and modulus of elasticity testing group. Each testing group consisting of group without and with addition of 1% and 1.5% E-glass fiber. Impact strength test was performed using Charpy impact tester, while transverse strength and modulus of elasticity were performed using the Universal Testing Machine. After the test, fracture surface of the samples was evaluated and scanning electron microscope view was taken. The effect of E-glass fiber addition to impact, transverse strength and modulus of elasticity on heatpolymerized acrylic resin was analysed with one-way ANOVA statistical test. Pearson Correlation test was then performed to determine the correlation between impact, transverse strength and modulus of elasticity. RESULTS There was an effect of E-glass fiber addition (chopped strands of 3 mm size) with 1% and 1.5% weight concentration to impact strength p=0.0001 (p<0,05); transverse strength p=0,002 (p<0,05); and modulus of elasticity p=0.002 (p<0.05). Pearson Correlation test showed that there was no correlation between impact and transverse strength (r=0.311 and p=0.094) (p>0.05); impact strength and modulus of elasticity (r=0.284 and p=0.128) (p>0.05); and transverse strength with modulus of elasticity (r=-0.044 and p=0.816) (p>0.05). CONCLUSION Addition of 1% and 1.5% E-glass fiber can improve the impact strength, transverse strength, and modulus of elasticity of heatpolymerized acrylic resin denture base and the addition of 1% E-glass fiber can increase a balanced of impact strength, transverse strength, and modulus of elasticity of heat-polymerized acrylic resin denture base.

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Bahan cetak polivinil siloksan(PVS) sering digunakan pada pencetakan untuk pembuatan gigi tiruan cekatkarena mampu menghasilkan cetakan yang akurat dengan dimensi cetakan yang stabil serta dapat disimpan dalam waktu lama. Namun, pencetakan ini tidak terlepas dengan hubungannya terhadap rongga mulut dan mikroorganismenya yang dapat menimbulkan infeksi silang.Candida albicansmerupakan jenis mikroorganisme yang sering ditemukan melekat pada permukaan cetakan. Pemilihan cara desinfeksi penting dalam memperoleh keberhasilan desinfeksi Candida albicansserta mempertahankan stabilitas dimensi hasil cetakan. Penelitian ini bertujuan untuk mengetahui pengaruh desinfeksi cetakan fisiologis dengan microwave dan sodium hipoklorit terhadap jumlah Candida albicansdan stabilitas dimensi model kerja gigi tiruan cekat. Penelitian ini dilakukan pada sampel berupa cetakan yang didapat dari pencetakan model induk yang terbuat dari stainless steel berbentuk silindris dengan tinggi 3 mm dan diameter 29,97 mm serta memiliki 3 takik horizontal dengan jarak 2,5 mm dan 2 takik vertikal dengan jarak 25,02 mm dengan kedalaman 500 μm untuk uji jumlah Candida albicans, dan model kerja yang didapat dari pengisian cetakan dengan bahan gips keras tipe IV untuk uji stabilitas dimensi. Rancangan penelitian adalah eksperimental laboratoris dengan post test only control group design.30 sampel hasil cetakan PVS digunakan untuk menghitung jumlah Candida albicansdan 30 sampel model kerja terbuat dari gips tipe IV digunakan untuk pengukuran stabilitas dimensi. Data yang diperoleh dianalisis dengan uji Kruskal-Wallis. Hasil penelitian menunjukkan ada pengaruh desinfeksi cetakan fisiologis dengan microwavedan sodium hipoklorit terhadap jumlah Candida albicansdan stabilitas dimensi model kerja.

Mouthwash is an additional mechanical oral cavity cleaning method which is known to reduce oral bacterias that causes plaque build ups. Mouthwash may and may not contain alcohol. The objective of this study was to determine the alterations on the oral cavity environment (salivary pH and plaque index) before and after gargling with alcohol and non-alcohol mouthwash, and to analyze which of the mouthwash is more effective. This study was an experimental study with one group pre test and post test experimental design. The subject of this study was 16 of University of Sumatera Utara’s female undergraduates whose age ranges from 18–23 years old and accorded to the inclusion and exclusion criteria. Subjects were divided in two groups, subjects were instructed to used the mouthwash twice a day for seven days, then salivary pH and plaque index were measured at third and seventh day of used. Repeated Annova test results shown a significant decreas on salivary pH and plaque index after gargled with mouthwash containing alcohol, in the non-alcohol mouthwash there was a significant decreased in plaque index but none on the salivary pH. Dependent T-test results shown that there were no difference in salivary pH and plaque index after gargled with alcohol containing and non-alcohol mouthwash. This study shows that non-alcohol mouthwash is better because there were a significant decrease in plaque index, without caused significant decreases in pH scores.

Introduction:Clinical assessment of complete denture by the dentists may differ from the patient’s satisfaction. Dentists will prioritise the clinical aspects of dentures, while patients will prioritise more on their satisfaction. The purpose of this study was to determine the relationship between the stability and bearing area of maxillary and mandibular denture towards the complete denture wearers satisfaction. Methods: This study was a cross-sectional study with purposive sampling method. The subject of this study was as much as 30 people. The research was conducted in each patient’s house to obtained more honest review of the patient’s satisfaction towards their complete dentures without being affected by any clinical environment, and in accordance to the information of their medical records. All the subjects were interviewed using a questionnaire before a clinical evaluation was conducted. The test analysis used was the Fisher test. Clinical examination was used to assess denture stability and bearing area. Evaluation of the patient’s satisfaction level was performed using a questionnaire regarding mastication and comfort. Results:There was a significant association between the clinical evaluation towards the patient’s satisfaction level which were the stability of maxillary denture towards mastication (p = 0.012); and mandibular denture towards mastication (p = 0.029). Whereas no relationship found between maxillary denturebearing area towards comfort (p = 0,051) and mandibular denture-bearing area towards comfort (p =0,547).Conclusion:Stability of maxillary and mandibular denture affected the patient’s mastication satisfaction, whereas bearing area of maxillary and mandibular denture was not affected the patient’s comfort satisfaction.