PERBEDAAN KEKUATAN FLEKSURAL FIBER REINFORCED COMPOSITE DENGAN SATU LAPIS DAN DUA LAPIS FIBER ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE (UHMWPE)

PERMATA DYDHA PUTRI, drg. Purwanto Agustiono, S.U.

2014 | Skripsi | PENDIDIKAN DOKTER GIGI

Fiber reinforced composite (FRC) digunakan sebagai material restorasi gigi tiruan cekat (GTC). Area anterior sering mengalami fraktur. Aplikasi lebih dari satu fiber pada FRC dilakukan untuk mengatasi fraktur area anterior. Penelitian ini bertujuan untuk mengetahui perbedaan kekuatan fleksural satu lapis fiber dan dua lapis fiber pada FRC tipe UHMWPE. Bahan penelitian adalah FRC dengan matriks flowable composite (Master Flow, Brazil) dan fiber UHMWPE (Construct,USA). Sampel penelitian FRC dengan fiber UHMWPE berbentuk balok (2 mm x 2 mm x 25 mm). Sampel dibagi menjadi kelompok I dengan 1 lapis fiber dan kelompok II dengan dua lapis fiber. Sampel dibuat 4 buah untuk masing – masing kelompok. Sampel disinari dengan light cure selama 20 detik dan penyinaran dilakukan sebanyak 4 kali. Sampel direndam dalam akuades 120 ml dengan suhu 37 0 C selama 24 jam. Kekuatan fleksural diukur dengan Universal Testing Machine (Tokyo Testing Machine). Data kekuatan fleksural kemudian dianalisis secara statistik menggunakan uji independent t-test dengan taraf signifikansi 0,05. Hasil penelitian menunjukkan rerata kekuatan fleksural kelompok 1 lapis fiber yaitu 61,23 ± 26,42 Mpa dan 2 lapis fiber yaitu 117,28 ± 19,86 Mpa. Hasil uji independent t-test menunjukkan terdapat perbedaan kekuatan fleksural antara kelompok 1 lapis fiber dan 2 lapis fiber UHMWPE (p<0,05). Kesimpulan penelitian ini adalah kelompok FRC dengan 2 lapis fiber memiliki kekuatan fleksural yang lebih besar dibandingkan kelompok 1 lapis fiber.

Fiber reinforced composite (FRC) was used as a fixed partial denture restorative material. Anterior area often experienced fractures. Application more than a single fiber in FRC was done to overcome the fractures of the anterior area. The aim in this study was to determine the difference in flexural strength between one layer and two layers of UHMWPE type of FRC. The material used in this study were FRC flowable composite matrix (Master Flow, Brazil) and UHMWPE fiber (Construct, USA). FRC study samples with UHMWPE fiber were shaped a beam (2 mm x 2 mm x 25 mm). Samples were divided into group I with one layer of fiber and group II with two layers of fiber. Four samples for each group. The sample were light cured for 20 seconds and performed for 4 times. Samples were soaked into 120 ml aquades with a temperature of 37°C for 24 hours. Flexural strength was measured by a Universal Testing Machine (Tokyo Testing Machine). Flexural strength data were analyzed statistically using independent t - test with a significance level of 0,05. The results of this study showed that the mean flexural strength of the group I was (61.23±26,42) MPa and group II was (117.28±19,86) MPa. The results of independent t - test showed that there were flexural strength differences between one layer group and two layers group of UHMWPE fiber (p < 0,05). The conclusion of this study is the FRC group with two layers of fiber has a flexural strength higher than FRC groups with one layer of fiber.

Kata Kunci : FRC, fiber UHMWPE, kekuatan fleksural.