A recent technology of Bulk fill composite resin has been developed to save manipulation time. Bulk fill composite resinhas been claimed to have depth of cure up to 4 mm with a high degree of conversion. This paper will evaluate the role of bulk fill composite resin’s composition in increasingits degree of conversion. The degree of conversion is the percentage of carbon double bonds that were converted into single bonds as a result of polymerization. It is determined by its composition that contained filler, resin matrix and the photoinitiator. With the development and modifications of the composition, the bulk fill compositeresin can be obtained a high degree of conversion so that the expected properties can be achieved.
Disinfectant by microwave energy is highly recommended as a solution to solve the problem of chemical disinfection on denture bases. One of the denture base materials is heat cured acrylic resin. Aim, to evaluate the effect of disinfectant by microwave energy with different time on the transversal strength of heat cured acrylic resin. 30 plates (n = 6) of heat cured acrylic resin with size 65x10x2,5 mm were divided into 5 groups (control; and microwave energy disinfected for 2, 4 , 6, and 8 minutes with 650 Watts of power). Transversal strength test was carried out using Torsee's Electronic System Universal Testing Machine with a test speed of 0.1 mm / second, and a load cell of 50 kgf. Data analyzed using one-way ANOVA and LSD pos hoc. Results, there were significant differences in the transverse strength among all groups (p <0.05). Mean values of all groups were 103.59 ± 0.66 MPa; 112.02 ± 2.10 MPa; 117.48 ± 1.73 MPa; 125.46 ± 2.25 MPa; and 135.89 ± 1.56 MPa respectively. Conclusion, the longer it is disinfected by microwave energy, the higher the transversal strength of heat cured acrylic resin.
Akhir-akhir ini teknologi nano semakin berkembang pesat di bidang kedokteran gigi. Penggunaan teknologi ini akanmemungkinkan pengembangan ilmu material dan bio-teknologi. Teknologi nano mengembangkan bahan dalam bentukpartikel berukuran nano untuk mendapatkan produk-produk yang lebih baik. Hal ini erat hubungannya denganperkembangan bahan dan perawatan di kedokteran gigi. Makalah ini akan memaparkan mengenai pengaplikasianteknologi nano, teknologi pemanipulasian serta tujuan penggunaan teknologi nano di bidang kedokteran gigi.Nanokomposit, dental implan, nanoadhesif, bahan cetak nano, gigi tiruan, pasta gigi dan kawat ortodonti merupakanbahan yang telah menggunakan teknologi nano. Sintesa partikel nano dapat diakukan dengan metode top down (fisika)dan metode bottom up (kimia). Sebagai kesimpulan, dengan teknologi nano ini akan diperoleh sifat-sifat bahan yang lebihbaik pada sifat fisis (hardness, translusensi, flow), mekanis (strength, modulus of elasticity, strength, khemis(osseointegrasi) dan biologis. Walaupun demikian masih ada keburukan yang masih kontroversi pada penggunaanteknologi nano, misalnya sitotoksisitas.
Denture base made of heat-cured acrylic resin can be sometimes fractured easily during impact such as falling while cleaning it. This study aimed to evaluate the impact strength of heat-cured acrylic resin added with banana (Musa acuminata Linn.) stem fiber of 0.5%, 1%, 1.5% by weight. A total of 32 plate-shaped specimens of heat-cured acrylic resin measuring 65 x 10 x 2.5 mm were divided into 4 groups, group I as control (without addition of banana stem fiber), group II (with addition of 0.5% banana stem fiber), group III (with addition of 1% banana stem fiber), and group IV (with addition of 1.5% banana stem fiber), then the impact strength test was performed using a Charpy Impact Tester. The result shows that the impact strength were increased from group I to group IV and the data obtained were analyzed statistically using One Way ANOVA and post hoc LSD test (p <0.05). The data showed significantly results of the impact strength value with group IV as the highest among all groups, and an increase in impact strength occurred along with increase in the percentage of fiber added to the heat-cured acrylic resin. Based on the results, banana stem fiber has the potential as heat cured acrylic resin reinforcement materials.
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