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Journal : Jurnal Teknosains

BERMULA DARI MIMPI MEWUJUDKAN INOVASI M.K. Herliansyah
Jurnal Teknosains Vol 1, No 2 (2012): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.5979

Abstract

Kemakmuran suatu bangsa tergantung pada kemampuannya memanfaatkan sumbersumberalam dan mengembangkan serta memproduksi suatu produk. Bahkan kemampuanmengembangkan serta memproduksi suatu produk merupakan komponen terpentingpenentu tingkat kemakmuran ekonomi suatu bangsa. Bukti-bukti telah menunjukkan banyakbangsa-bangsa di dunia yang miskin sumber alam, tetapi memiliki tingkat kemakmuranyang tinggi karena keunggulannya dalam kemampuan mengembangkan serta memproduksiproduk-produk baru dan unggul.
PENGEMBANGAN MATERIAL PASAK ENDODONTIK Ti/40HA DENGAN MENGGUNAKAN KONSEP FUNCTIONALLY GRADIENT MATERIAL M. K. Herliansyah
Jurnal Teknosains Vol 2, No 2 (2013): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6001

Abstract

Commercial endodontic pegs have a homogeneous composition and strength so that the transmission voltage of pegs to dentin often result in damage to the tooth root. The concept of functionally gradient material (FGM) is expected to overcome these problems by adjusting the mechanical properties of each peg to the nature of the teeth. This study aims to develop a material stake with the concept of FGM from Ti/40HA material that is composed of five layers with concentrations of HA from 0% - 40% wt through the process of uni-axial pressing followed by sintering at 1200oC and 1400oC in argon gas. Then performed on each layer characterization by SEM / EDX, the optimum sintering temperature was determined by test-t (p <0,05). Morphological Testing showed that the composite of Ti/40HA still porous, while EDX shows the composition of Ca and P increase as an indication of increment in the concentration of HA as the decrement in concentration of the layer-1 (100% Ti) up to layer-5 (60% Ti-40% HA). In conclusion, Ti/40HA200 and Ti/40HA200 composite materials can be produced by decreasing its roughness as the rising concentrations of HA in each section.
SCAFFOLD BHA/GELATIN DENGAN PELAPIS PVA UNTUK APLIKASI IMPLAN Alva Edy Tontowi, MK Herliansyah, dan Punto Dewo
Jurnal Teknosains Vol 3, No 1 (2013): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6123

Abstract

Hard tissue defect, particularly at the bone structure, is a common problem in Indonesia causing improper function. About 60% of it is caused by defects that occur since birth, and the rest is caused by other factors, such as accidents. To treat these problems, medical doctor usually carry out transplantation or implantation. Implantation is done by filling the bone cavity with biomaterial made from Ca/P-based material, such as hydroxyapatite (HA). In the form of powder, pure HA is difficult to be formed into a certain shape and geometry since this material is brittle and has a high melting point (1400 oc), which is impossible to reach in a surgery environment. Additionally, in the form of macro-porous blocks, they are very weak and easy to break, far from the requirements. In order to form pure HA at room temperature and still fulfill the required strength, other biocompatible materials are needed. In this work, HA, gelatin and PVA were used to form samples. The HA was derived from bovine bone, bioactivity and oteoconductivity. Gelatin was used as a matrix of the composite, whilst Polyvynil Alchohol (PVA) acted as a coating. The HA was derived by calcination of bovine chips at 900 oC for 2 hours, while the gelatin (G) and PVA were supplied by commercial purchase. The ratio of [G/bHA] to distilled water (H2O) was 30%, 40% dan 50% w/v. PVA 0.2% w/w coating was done by dipping the block in liquid nitrogen (N2). Tests were performed by DTS and microstructure analysis was carried out by SEM. The results show that sample with [G/bHA] of 50% w/v gave DTS of 6.219 MPa. This tensile strength matched the strength of human bone from a 62 year old person.  ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
MODEL INTEGRASI DESIGN DAN PROSES MANUFAKTUR PADA PERAKITAN PRODUK MULTI-PEMASOK Budi Susanto, MK Herliansyah, dan Alva Edy Tontowi
Jurnal Teknosains Vol 3, No 1 (2013): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.6125

Abstract

In Product design process, aspects related to the manufacturing process and supply chain should be considered. The design is produced not only satisfy for consumers needs but it fulfilled the constraints related to manufacturingand supply chain aspects. This research aims to make a model to determine the cheapest product design from both of manufacturing process and supply chain. This research uses binary programming as an approach. The cost aspects used in this research are component’s manufacturing cost, supplier fixed contact cost, assembly operation cost and quality improvement cost. The result of research, a physical product design with the lowest total cost by combining components from several designs and adding the value constraint on the quality specification.
UJI IRITASI MATERIAL COBALT CHROMIUM SEBAGAI MATERIAL DASAR BONE PLATE UNTUK REKONSTRUKSI MANDIBULA Dian Permata Sari; Eti Nurwening Sholihah; Muhammad Kusumawan Herliansyah
Jurnal Teknosains Vol 7, No 2 (2018): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.8162

Abstract

The mandibular bone defect can cause speech disorder, mastication malfunction, and aesthetic problems. The application of plate for mandibular reconstruction can improve the function disorder. Plate material must be strong, resilient, able to adapt to the bone surface, and has good biocompatibility. Cobalt chromium is a cobalt base alloys are often used for implant materials. It has good mechanical properties, biocompatibility, and corrosion resistance. The aim of this study was to investigate the effect of local irritation and tissue response on material cobalt chromium. This study used three albino rabbits were injected by the material powder in polar and nonpolar solvents with intracutaneous injection method, then the treatments were observed on the first, second, and third days. Erythema and edema that occurs were scored based on grading system for intracutaneous (intradermal) reactions. Friedmann test showed no significant difference between treatment groups (p> 0.05). The results showed that erythema and edema arising from irritant reactions are still within normal limits. Irritation occurs due to the release of cobalt chromium ions which trigger hypersensitivity reactions and result in systemic immunity.