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All Journal POSITRON Padjadjaran Journal of Dentistry
Shaliha, Shaliha
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Biochemistry, Genetics & Molecular Biology Dentistry Energy Health Professions Immunology & microbiology Medicine & Pharmacology Physics Public Health

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Perluasan Kinerja Akustik Limbah Kayu Batang Kelapa Sawit Termodifikasi Bahan Formaldehida Manik, Tetti Novalina; Shaliha, Shaliha; Siregar, Simon Sadok; Santoso, Tanto Budi; Yahya, Iwan; Mashuri, Mashuri; Zainuri, Muhammad; Darminto, Darminto
POSITRON Vol 12, No 2 (2022): Vol. 12 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.893 KB) | DOI: 10.26418/positron.v12i2.55963

Abstract

Chemical modifications for waste oil palm trunks had carried out as acoustic material. This modification was conducted in two stages. Firstly, formalization with formaldehyde solution and secondly is impregnation with melamine-formaldehyde resin. Formalization was conducted in alkaline condition (pH 10) for 3 days and 5 days. Impregnation was carried out under pressure 3 bar and 5 bar and held for an hour. For completed these modification, the samples was cured at 120oC for 10 minutes and then dried at (103±2)oC to reached moisture content of less than 6%. This modification has changed the chemical structure and the morphology of wood, as shown by the FTIR and SEM results. The samples became denser, stronger and more rigid. Furthermore, the mechanical and physical properties of modified wood are also increasing. The absorption coefficient decreases with increasing formalization time and impregnation pressure. Based on trend of absorption coefficient, BKS wood can be applicated as resonant absorber with work class from A to class B and D.
Alveolar bone trabeculae in patients with aggressive patients with aggressive periodontitis using cone beam computed tomography imaging Shaliha, Shaliha; Firman, Ria Noerianingsih; Rusyanti, Yanti
Padjadjaran Journal of Dentistry Vol 24, No 2 (2012): July 2012
Publisher : Faculty of Dentistry Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pjd.vol24no2.26828

Abstract

Introduction: Periodontitis is an inflamatory process in supporting tissues of the teeth including the gingiva, cementum, periodontal ligament and alveolar bone. Perioditis ntitis begins with migration of junctional ephithelium toward the apical side and form a pocket on gingiva. Aggressive periodontitis is one of the classifications of periodontitis with characteristics of attacking teens to young adults in relatively fast can lead to severe alveolar bone loss and it is not comparable with local factors that there. Trabeculae are part of the alveolar bone covered by compact bone and cortical bone harder . On radiographs, trabeculae only seen as a radiolucent surrounded by a radiopaque. The purpose of this research was to know the description of alveolar trabecular bone in patients with aggressive periodontitis using Cone Beam Computed Tomography imaging. Methods: This study is descriptive on 72 samples of aggressive periodontitis alveolar travecular bon e by CBCT imaging, taken from 6 archival aggressive periodontitis patients as research subjects, obtained from secondary data in the Radiology Department of RSGM FKG UNPAD. Results: The results of this study from the 3D CBCT imaging of alveolar trabecular bone leading to further describe the more posterior a decline in trabecular bone density and decrease in patients with aggressive periodontitis. Conclusion: The 3D CBCT imaging of alveolar trabecular bone leading to further describe the more posterior a decline in trabecular bone density and decrease in patients with aggressive periodontitis.
Co-Authors Darminto . Iwan Yahya Manik, Tetti Novalina Mashuri Mashuri Muhammad Zainuri Ria Noerianingsih Firman, Ria Noerianingsih Santoso, Tanto Budi Simon Sadok Siregar, Simon Sadok Yanti Rusyanti, Yanti