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Guided Tissue Regeneration of the Mixture of Human Tooth-Ash and Plaster of Paris in Dogs
Ku, Ha Ra,Jang, Hyun Seon,Kim, S.G.,Jeong, Moon Jin,Park, Joo Cheol,Kim, Heung Joong,Kwon, Young Sun,Kim, Chong Kwan,Kim, Byung Ock Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.330-332 No.1
<P>This study evaluated the efficacy of periodontal tissue regeneration using guided tissue regeneration (GTR) with a mixture of tooth ash and plaster as a bone substitute material in the treatment of class II furcation defects in dogs. GTR was performed at the site of a surgically formed mandibular premolar bifurcation area in dogs. Four adult dogs were used in the animal study. The animals were in a good periodontal state without any systemic disease. A resorbable membrane (Bio-Gide®, Swiss) and bone graft material using a mixture of tooth ash and plaster were used to examine the biological activity. The defect in the control group was filled a Bio-Gide® only. For the experimental group, the defects were filled with a mixture of tooth ash and plaster and covered by a Bio-Gide®. Oral rinsing with 0.12% chlorhexidine was performed twice a day for 2 weeks. In control group, new bone formation was observed adjacent to the preexisting bone. Soft tissue ingrowth was also noted. In experimental group, new lamellar type trabecular bone formation as well as centum and PDL regeneration was observed in the base of the infrabony pocket. More bone regeneration would be expected when GTR is performed using a mixture of human tooth-ash and plaster of Paris as a bone graft material.</P>
Orbital and Attitude Control of a Spacecraft Around an Asteroid
Mahmut Reyhanoglu,Niloofar N. Kamran,Kuhara Takahiro 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
The objective of this paper is to design an effective control scheme for an asteroid orbiting satellite. The paper first introduces the dynamics formulation of such satellites and then provides a framework for the control system design. The control objective is to achieve a nadir pointing attitude on a circular equatorial orbit. Lyapunov-based nonlinear feedback laws are constructed to control the rotational and translational motion of the satellite so that the control objective is achieved. Computer simulations are carried out to illustrate the effectiveness of the control laws.