Perbedaan Nilai Kekerasan Resin Komposit Berbahan Dasar Silorane Dengan Resin Komposit Berbahan Dasar Methacrylate Sesaat dan Seminggu Setelah Fotoaktivasi Dengan LED
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2012-10-31
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Abstract
Perbedaan Nilai Kekerasan Resin Komposit Berbahan Dasar Silorane Dengan Resin
Komposit Berbahan Dasar Methacrylate Sesaat dan Seminggu Setelah Fotoaktivasi Dengan
LED-Rani Mahmuda Sultana-160621090004
iv
ABSTRAK
Masalah utama bahan restorasi komposit adalah kebocoran mikro, akibat penyusutan saat
polimerisasi. Resin komposit jenis baru silorane terdiri dari gugus oxitrane yang kuat dan
siloxane yang bersifat hidrofob. Berbeda dengan resin komposit methacrylate yang melepaskan
radikal bebas saat polimerisasi, silorane berpolimerisasi dengan pembukaan cincin oxitrane.
Polimerisasi resin komposit methacrylate menghasilkan pengurangan volume, sedangkan
polimerisasi pada silorane menghasilkan pengembangan volume.
Penelitian ini adalah penelitian eksperimental murni secara invitro, bertujuan untuk
mengetahui perbedaan kekerasan resin komposit berbahan dasar silorane dengan resin komposit
berbahan dasar methacrylate sesaat dan seminggu setelah fotoaktivasi menggunakan LED.
Dibuat 40 spesimen komposit (bentuk lempeng, tinggi 2mm diameter 6mm), terdiri dari 20
spesimen resin komposit silorane dan 20 spesimen resin komposit methacrylate. 10 spesimen
diambil secara acak dari tiap kelompok, direndam dalam saliva artifisial dan disimpan pada suhu
37 °C selama seminggu, lalu dilakukan uji kekerasan. 10 sampel sisa dari tiap kelompok
direndam saliva artifisial selama 10 menit lalu dilakukan uji kekerasan. Pengujian kekerasan
dilakukan menggunakan Vickers Microhardness Test (w=100gr, t=15detik), dengan tiga titik
indentasi setiap sampel. Hasil pengukuran dinyatakan dalam VHN dan diuji secara statistik
mengunakan ANAVA.
Tingkat kekerasan resin komposit berbahan dasar silorane secara signifikan lebih rendah
bila dibandingkan dengan resin komposit berbahan dasar methacrylate, tetapi stabil terhadap
perubahan kekerasan. Perbedaan tingkat kekerasan berkaitan dengan jenis ukuran filler pada
masing masing bahan, sementara kestabilan kekerasan resin komposit silorane berkaitan dengan
komposisi kimia gugus oxitrane-siloxane yang membentuknya.
Kata kunci: Kekerasan, Silorane, Methacrylate, Fotoaktivasi LED, Sesaat, Seminggu,
The difference level of hardness silorane based composite dan methacrylate based composite
a moment and a week post irradiation with LED-Rani Mahmuda Sultana- 160621090004
v
ABSTRACT
A major problems of dental composite is microleakage as result of polymerization
shrinkage. Silorane based composite comes from the combination of an advantages oxitrane
which is known as very stable, and strong material with siloxane as hidrofobic materials.
Direffent from methacrylate based composite wich release free radicals during
polymerization, silorane has an opening of cation ring oxitrane, result volume expantion of
resin, contradiction from methacrylate based wich result volume reduction of resin because it
shrinkages.
This in vitro study aimed to evaluated difference values of surface microhardness
between silorane based composite and methacylate based composite in two different time; 10
minute after irradiation and a week after irradiation using LED. Fourthy specimen of
composite disc (2mm height, 6mm diameters); consist of twenty silorane based, and twenty
methacrylate based. From each grup 10 specimen taken randomily, immeresed in artificial
saliva, kept in 37°C incubator for a week then tested microhardness. 10 specimen left in each
group, immeresed in artificial saliva for 10 minutes then tested microhardness. Microharness
was measured by Vickers Hardness Tester (VHT) with load 100gr for 15 second. Three
indentation were performed on each sample, the value is in VHN and evaluated by ANOVA .
Result of this study shows very significant differences values of surface hardness
between two composite materials. Even silorane based composite claimed had lower hardness
value than methacrylate’s, this study showed silorane were stable material due changes in
longer periode storage by slight increase (non-sigificant) hardness value. Hardness of each
material depents on the size filler content, but silorane hardness stability resulted by chemical
block Oxitrane-siloxane
Key words: Hardness, Silorane, Methacrylate, Irradiation LED, Moment, Week after.
Description
Keywords
Kekerasan, Silorane, Methacrylate