Angela Evelyna
Faculty of Dentistry Maranatha Christian University

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Pengaruh Perbandingan Bahan Pengisi (alumina-magnesia-silika) Terhadap Karakteristik dan Kekerasan Nanokomposit Berbasis Geopolimer untuk Aplikasi Bracket Ortodontik Cekat Kiky Viviani; Angela Evelyna; Bambang Sunendar Purwasasmita
Jurnal Material Kedokteran Gigi Vol 4 No 1 (2015): JMKG Vol 4 No 1 Maret 2015
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (380.4 KB)

Abstract

Ceramic bracket has advantage that good aesthetic and good hardness, however it has weaknesses which are high cost and brittle so that, it needed others alternative substances such as composite. Nanocomposite has grown in many regions, one of them is in dentistry. Nanocomposite frequently used because of synthesis relative simple and it can increase characteristics substance. This study was alumina, magnesia, silica synthesized with sol-gel technique for filler of nanocomposite based geopolymer. The purposes of this study are to obtain initial characteristics and hardness of nanocomposite aluminamagnesia-silica. Specimens of this study were nanocomposite with ratio filler alumina-magnesia-silica 48:40:12 (group I) and 65:30:5 (group II). XRD used to determine the crystalline phase and composition filler powder alumina-magnesia-silica, whereas SEM and Vickers hardness test used to determine the morphology microstructure and hardness nanocomposite surface. XRD test represent phase magnesia alumina spinel formed in both groups, with crystalline size are 30-39 nm. SEM test of group I represent particle dispersion more prevalent, whereas SEM test of group II represent agglomeration particle and porous. The average of group I was 60,16 VHN, while the average of group II was 6,98 VHN. Visualization nanocomposite of group I represent transparent color and group II represent white opaque color. Conclusion of this study is nanocomposite with ratio of filler alumina- magnesia-silica 48:40:12 (group I) has particle dispersion more prevalent and hardness higher than nanocomposite with ratio of filler alumina-magnesia-silica 65:30:5 (group II), but the application as a bracket fixed orthodontic further study is needed.
Chitosan 2% Effect on Prohibiting the Growth of Candida Albicans on Heatcured Acrylic Resin Angela Evelyna; Dahlia Sutanto; Elizabeth Tiffany
Jurnal Material Kedokteran Gigi Vol 6 No 2 (2017): JMKG Vol 6 No 2 September 2017
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (538.236 KB) | DOI: 10.32793/jmkg.v6i2.266

Abstract

Maintaining acrylic denture hygiene is a necessary to prohibit the growth of several oral fungi such as Candida albicans. Candida albicans are the main etiological microorganism of denture stomatitis. One of the ways to clean denture is by immersion on synthetic denture cleaner liquid such as oxygenizing denture cleaners. However, synthetic denture cleaner have several limitation due to its biocompatibility on human body especially oral tissue. Chitosan is a derivate of chitin, a natural compound of sea creature exosceleton. Chitosan have antifungi and antibacterial nature. The objective of this study is to evaluate the antifungi efectifity of chitosan 2% on acrylic heatcured and compare it with oxygenizing denture cleaner. Aquades is used as a control. The sample consists of 15 acrylic heatcured bars (10x10x2 mm) prepared by contamination on Candida albicans suspensions at temperature 37°C for 24 hours and immersed on 3 different treatments wich are chitosan 2%, oxygenizing denture cleanser, and aquades as control and then, the solutions are being vibrate and put into sabouraud dextrose agar medium. The colony of Candida albicans counted manually. Result shows, highest mean of Candida albicans colony on aquades group (365,66 CFU/plate), followed by oxygenizing denture cleanser treatment (178,33 CFU/plate). The smallest number colony of Candida albicans are found at chitosan 2% treatment (45,33 CFU/plate). Statistical analysis using ANOVA one way shows F=9.826 and p=0, this means, there is minimal one pair of groups with very significant differential (p<0,01) which are chitosan 2% and oxygenizing denture cleanser compared to aquades as control. The difference between those two treatments also significant. Conclusions of this study is that chitosan 2% solution have a sifnificant effect on prohibiting the growth of Candida albicans colony on acrylic heatcured denture base materials. The effectivity of this solution is significantly higher than oxygenizing denture cleanser treatment.