Hasil Pencarian  ::  Simpan CSV :: Kembali

"Penelitian ini bertujuan untuk menganalisis pengaruh ketebalan komposit resin serat pendek KRSP dan iradiansi terhadap kekerasan dan depth of cure DoC. Dua puluh empat spesimen KRSP berbentuk silinder berdiameter 6 mm dibagi menjadi 2 kelompok ketebalan; 4 dan 5 mm n=12. Masing-masing kelompok dibagi menjadi 2 kelompok yang dipolimerisasi dengan iradiansi berbeda; 1000 dan 1200 mW/cm2 n=6. Setiap spesimen dipolimerisasi selama 20 detik dengan jarak penyinaran 2 mm. Nilai kekerasan didapat melalui uji kekerasan Vickers dan DoC didapat dengan mengukur rasio kekerasan permukaan bawah terhadap permukaan atas. Data dianalisis menggunakan uji statistik One-Way ANOVA. Hasil penelitian menunjukkan adanya perbedaan signifikan.

---

This study aims to analyze the effect of short fibre reinforced resin composite SFRC thickness and light curing irradiance on the hardness and depth of cure DoC . Twenty four specimens of SFRC were made into cylindrical shape with a diameter of 6 mm and divided into 2 different thickness groups 4 and 5 mm n 12. Each group was divided into another 2 different groups which was cured by different irradiance 1000 and 1200 mW cm2 n 6 . Each specimen was cured for 20s with 2 mm light curing distance. The hardness was measured by Vickers hardness test and DoC was measured by calculating a hardness ratio of the bottom to the top surface of specimens. Data were analyzed statistically by One Way ANOVA tests. The result showed significant differences."

"Objectives. The aim of this study was to compare the fracture toughness of a microhybrid and a flowable microhyrid resin composites. Methods. Test specimens (30x15x2)mm made of amicrohybrid and a flowable microhybrid were prepared in a double torsion mould and were then polymerized for 20 seconds using a light-curing device. Taken out from the mould, the specimens were than soaked in disfilled water (37°C) for 1 hour and then fractured in a double-torsion technique. t-Test was used to test significance difference between the microhybrid and flowable microhybrid resin composites. Result. The use of double-torsion technique resulted in crack initition and crack arrest which revealed Klc of 1.14 MN/m3/2 and 1.045 MN/m3/2 for the microhybrid and the flowable microhybrid resin composites, respectively. Both resin composites were insignificantly different in the fracture toughness values showed by t–Test. Conclusions. The present study suggested that there was no significant difference between the microhybrid and the flowable microhybrid resin composites tested. It appreared that filler fraction might not affect the fracture toughness of the resin composties tested."

"Kebutuhan akan restorasi tuang di bidang Kedokteran Gigi semakin meningkat seiring dengan keberhasilan pembangunan Indonesia. Logam pilihan untuk membuat restorasi tuang pada umumnya adalah logam paduan emas. Material yang beredar di Indonesia pada umumnya masih harus diimpor dari luar negeri dan harganya cukup mahal. Dengan meningkatnya harga emas, maka perlu dicari logam alternatif lain untuk restorasi tuang. Indonesia yang merupakan salah satu penghasil tambang nikel dan tembaga, maka sudah sepatutnya dapat memanfaatkannya untuk berbagai keperluan termasuk di bidang Kedokteran Gigi. Dalam penelitian ini akan digunakan logam paduan nikel-tembaga-mangan untuk keperluan restorasi gigi. Hasil penelitian di tahun pertama telah dibuat 5 komposisi paduan nikel-tembaga-mangan dan dilakukan uji komposisi, kekerasan, kemampuan tuang, dan kekuatan tarik. Hasil penelitian menunjukkan bahwa paduan Ni-Cu-Mn lebih keras dari logam paduan emas. Kemampuan tuang cukup baik terutama paduan dengan temperatur lebur kurang dari 1000°C. Kekuatan tarik memperlihatkan hasil yang bervariasi dimana paduan 5ONi-30Cu-20Mn mempunyai kombinasi kekuatan maksimal dan strain yang cukup besar. Hal tersebut memperlihatkan bahwa paduan nikel-tembaga-mangan dapat digunakan sebagai bahan untuk pembuatan restorasi tuang. Walaupun demikian masih perlu dilanjutkan dengan uji sifat khemis, yaitu uji korosi, dan uji biologis mengenai biokompatibiliti bahan pada tahun berikutnya."

"ABSTRAKKebutuhan akan restorasi tuang di bidang kedokteran gigi semakin meningkat seiring dengan keberhasilan pembangunan Indonesia. Logam pilihan untuk membuat restorasi tuang pada umumnya adalah logam paduan emas, dan material yang beredar di Indonesia pada umumnya masih harus diimpor dari luar negeri dan harganya cukup mahal. Dengan meningkatnya harga emas, maka perlu dicari logam alternatif lain untuk restorasi tuang. Indonesia yang merupakan salah satu penghasil tambang nikel dan tembaga, sudah sepatutnya dapat memanfaatkannya untuk berbagai keperluan termasuk di bidang kedokteran gigi.Dalam penelitian ini digunakan logam paduan nikel-tembaga-mangan untuk keperluan restorasi gigi. Hasil penelitian di tahun pertama telah dibuat 5 komposisi paduan nikel-tembaga-mangan, yaitu, 2ONi-40Cu-40Mn, 30Ni-40Cu-40Mn, 30Ni-40Cu-30Mn, 40Ni-30Cu-30Hn, dan 5ONi-30Cu-20Mn. Kelima paduan tersebut telah dilakukan uji komposisi, kekerasan, kemampuan tuang, dan kekuatan tarik.Hasil penelitian menunjukkan bahwa paduan nikel-tembaga-mangan mempunyai kekerasan yang lebih besar dari logam paduan emas. Temperatur lebur paduan berkisar dari 960 °C sampai dengan 1160 °C. Kemampuan tuang cukup baik terutama pada paduan dengan temperatur lebur kurang dari 1000 °C. Kekuatan tarik memperlihatkan hasil yang bervariasi dimana mempunyai kombinasi kekuatan tarik dan strain yang cukup besar. Hal tersebut memperlihatkan bahwa paduan nikel-tembaga-mangan dapat digunakan sebagai bahan untuk pembuatan restorasi tuang di bidang kedokteran gigi. Untuk memperbaiki sifat yang dipunyai logam paduan, maka perlu ditambahkan sedikit logam Pd (palladium).Pada penelitian pada tahun berikutnya perlu dilakukan pengujian sifat kimia, yaitu uji korosi, dan uji sifat biologis, yaitu uji toksisitas dan sensitivitas pada binatang percobaan.

---

ABSTRACTDemand for cast restorations in dentistry is rapidly increasing along with the improvement in economical status as a result of development. Among other metals used in dentistry, gold alloys are usually the metal of choice for cast restorations, because of its superior qualities. The materials available in Indonesia are still imported and they do cost a fortune. As the value of gold increases, it is necessary to use metal for cast restorations. For Indonesia, as one of the nickel and copper producing countries, it is most obvious that we should be able to utilize the metals for various purposes, especially in dentistry.The study uses nickel-copper-manganese alloys for tooth restoration. In the first year of study, 5 compositions of nickel-copper-manganese alloys combinations have been produced, namely: 2ONi-40Cu-4OHn, 30Ni-40Cu-40Mn, 3ONi-4OCu-30Mn, 4ONi-30Cu-30Mn, and 5ONi-30Cu-2OMn. Each of the five composition have undergone several tests, which are composition test, hardness test, castability, and tensile strength test.The result of the study shows that nickel-copper-manganese alloys are harder than gold alloys. The melting point of Ni-Cu-Mn alloys are between 960 °C and 1160 °C. The castability is satisfactory, especially when the melting point is below 1000 °C. Variety of its tensile strength has been noted, with a relatively high strain. These properties indicates that nickel-copper-manganese alloys can be used as cast restoration in dentistry. To improve the property or quality of the alloy, a small amount of palladium was added.Studies for the following year is designed to test the alloys chemical properties (corrosion) and biological properties (toxicity and sensitivity on experimental animals)."

"As the demand for healthy, attractive teeth increases, the methods and materials employed in restorative dentistry have become progressively more advanced. Non-metallic biomaterials for tooth repair and replacement focuses on the use of biomaterials for a range of applications in tooth repair and, in particular, dental restoration.Part one reviews the structure, modification and repair of dental tissues. The properties of enamel and dentin and their role in adhesive dental restoration are discussed, along with biomineralization and biomimicry of tooth enamel, and enamel matrix proteins (EMPs) for periodontal regeneration. Part two goes on to discuss the processing, bonding and wear properties of dental ceramics, glasses and sol-gel derived bioactive glass ceramics for tooth repair and replacement. Dental composites for tooth repair and replacement are then the focus of part three, including composite adhesive and antibacterial restorative materials for dental applications. The effects of particulate filler systems on the properties and performance of dental polymer composites are considered, along with composite based oral implants, fibre reinforced composites (FRCs) as dental materials and luting cements for dental applications.With its distinguished editor and international team of expert contributors, Non-metallic biomaterials for tooth repair and replacement provides a clear overview for all those involved in the development and application of these materials, including academic researchers, materials scientists and dental clinicians."