Judul: Evaluasi radiografi implan tulang Hidroksiapatit-Kitosan (Ha-K) dan Hidroksiapatit-Trikalsium Fosfat (Ha-TKF) pada domba sebagai hewan model untuk manusia
Abstrak: The study was aimed to compare in vivo osteogenesis potency of two bone implant combinations which used hydroxyapatite-chitosan (HA-C) and hydroxyapatite-tricalcium phosphate (HA-TCP). This study will describe the potential use of bone substitution material which implanted on sheep as animal model for human. Six local sheeps were used in this study. Both of the bone implants were shaped into a pellet form. The bone implants were inserted under aseptic surgery on the medial of the left tibia bone and as control the medial of the right tibia bone was drilled without bone implant. Bones were subjected to radiography examination at 0 day pre and post-surgery, 7 , 30 , 60 and 90 days post-surgery. The observation parameters are radiopacity, margination, and the shape of bone implant or bone defect under radiography evaluation. The result shown that the HA-TCP bone implant has better properties for biodegradability and bioresorbsibility than HA-C bone implant. In the other hand, the process of bone growth which implanted by HA-TCP bone implant was slow because the implant has no good osteoinductive properties. The both of implants were still stay in bone until the end of observation and the progress of osteogenesis did not show better result than the control.
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Judul: Kajian Morfologi Proses Persembuhan Kerusakan Segmental Pada Tulang Domba Yang Diimplan Dengan Komposit Hidroksiapatit-Trikalsium Fosfat (HA-TKF)
Abstrak: This study was aimed to evaluate in vivo osteogenesis potency of bones implanted with graft of hydroxyapatite-tricalcium phosphate (HA-TCP) composite. This study also observed the potential use of HA-TCP as bone substitution material. Three local sheeps were used in this study. The implant was inserted under aseptic surgery on the proximal medial of the left tibia bone and as control the proximal medial of the right tibia bone was drilled without implant. Bones were harvested after 30, 60, and 90 days post-surgery and observed macroscopic and microscopically. The parameters of observation were the condition, shape and degradation degree of the implant, bonding between implant and host bone, new bone growth into the implant and signs of inflammation reaction around the implant. The result showed that the healing process on control bone was faster than those of the implanted bone. The bone implant had been already degradated in treated group of day 30 post-surgery. HA-TCP bone implant shown some signs for its biocompatibility, biodegradability, bioresorbability and osteoconductivity properties. Therefore, it is suggested that HA-TCP implant might be used as bone substitution in the bone lesions with approximately 30 days of recovery.
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Judul: Gelombang soliter internal pada lapisan atmosfiri yang memiliki perubahan kecepatan angin yang cepat
Abstrak: Gelombang internal adalah suatu gelombang yang terjadi di dalam suatu fluida. Gelombang ini muncul karena adanya perubahan rapat massa di setiap lapisan di dalam fluida. Salah satu gelombang internal yang ditemui di lappisan atmosfir adalah gelombang soliter internal, seperti yang terjadi pada fenomena "morning glory" di Australia. pada fenomena "Morning glory" terjadi penurunan tekanan hingga bebrapa milibar.
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