PERBEDAAN KEKUATAN KOMPRESI ANTARA FIBER REINFORCED COMPOSITE DENGAN FIBER SISAL (Agave sisalana) TERALKALISASI DAN NON-ALKALISASI

ASEP SYAEFULLOH, Prof. Dr. drg. Widjijono, S.U.

2014 | Skripsi | PENDIDIKAN DOKTER GIGI

Fiber reinforced composite (FRC) merupakan material yang tersusun atas matriks dan material penguat berupa fiber. Fiber yang banyak digunakan untuk pembuatan gigi tiruan cekat (GTC) adalah fiber sintetis. Fiber sisal digunakan sebagai material penguat pada FRC karena murah dan berasal dari sumber yang dapat diperbarui. Alkalisasi pada fiber sisal dapat meningkatkan adhesi antara fiber dan matriks yang dapat meningkatkan kekuatan mekanik FRC. Tujuan penelitian ini adalah untuk mengetahui perbedaan kekuatan kompresi FRC dengan fiber sisal (Agave sisalana) teralkalisasi dan non alkalisasi. Bahan penelitian ini adalah FRC dengan matriks berupa resin komposit flowable (Master Flow, Brazil) dan fiber sisal (Balittas, Malang) serta larutan NaOH 5%. Sampel penelitian berupa FRC dengan fiber sisal (silindris, tinggi 8mm, diameter 4mm) disinari dengan light curing unit selama 20 detik. Sampel berjumlah 8 buah dan dibagi menjadi 2 kelompok yaitu alkalisasi dan non-alkalisasi (n=4). Sampel direndam dalam aquades selama 24 jam pada suhu 37°C. Kekuatan kompresi diukur dengan menggunakan universal testing machine dengan kecepatan tekan 1mm/menit. Data kekuatan kompresi kemudian dianalisis secara statistik menggunakan independent t-test (α=0,05). Hasil penelitian menunjukkan rerata kekuatan kompresi FRC dengan fiber sisal kelompok non-alkalisasi sebesar 463,40 ± 31,59 MPa dan kelompok alkalisasi sebesar 751,54 ± 27,22 MPa. Hasil independent t-test menunjukkan bahwa terdapat perbedaan kekuatan kompresi pada FRC dengan fiber sisal teralkalisasi daripada non-alkalisasi dengan perbedaan yang bermakna (p<0,05). Kesimpulan penelitian ini adalah kekuatan kompresi FRC dengan fiber sisal teralkalisasi lebih tinggi daripada FRC dengan fiber sisal non-alkalisasi.

Fiber-reinforced composite (FRC) is a material composed of a matrix and a reinforcing fiber. The fiber widely used for the manufacture of fixed partial dentures is a synthetic one. Sisal (Agave sisalana) fiber is used as a reinforcing material on FRC, for it is cheap and it comes from the renewable resources. Alkalization on sisal fiber can increase adhesion between the fiber and matrix. This can increase the mechanical strength of the FRC. The purpose of this research was to explore the difference between the compressive strength of the FRC with alkalized sisal fiber and that of the FRC with non-alkalized sisal fiber. The material of this research was FRC with matrix consisting of flowable composite resin (Master Flow, Brazil), sisal fiber (Balittas, Malang), and 5% NaOH solution. The research sample which was the FRC with sisal fiber (cylindrical, 8mm height, 4mm internal diameter) was cured using a light curing unit for 20 seconds. The number of the samples was 8 and they were divided into two groups; they are the alkalized and non- alkalized groups (n=4). The samples were soaked in aquades for 24 hours at a temperature of 37°C. The compressive strength was measured by using a universal testing machine with the compression speed of 1mm/minute. The data of the compressive strength was then analyzed statistically using independent t-test (α=0.05). The result of the research showed that the mean of the compressive strength of the FRC group with alkalized sisal fiber was 751.54±27.22 MPa and of FRC group with non- alkalized sisal fiber was 463.40±31.59 Mpa. The independent t-test showed that there was a significant difference in the compressive strength of the FRC with alkalized sisal fiber and that with non-alkalized sisal fiber (p < 0.05). The conclusion of this study was the compressive strength of the FRC with alkalized sisal fiber was higher than that of the FRC with non-alkalized sisal fiber.

Kata Kunci : FRC, fiber sisal, alkalisasi, kekuatan kompresi