BACKGROUND Heat-polymerized acrylic resins are commonly used as denture base, but they have relatively low mechanical properties such as impact strength, transverse strength, and modulus of elasticity that made them susceptible to fracture during clinical application. Various modifications were made to improve the mechanical properties of heat-polymerized acrylic resins, one of them was with the addition of E-glass fiber. We wanted to determine the effect of E-glass fiber (chopped strands of 3 mm size) with 1% and 1.5% weight concentration addition on mechanical properties (impact strength, transverse strength, and modulus of elasticity) of heatpolymerized acrylic resin denture base material and the correlation between them. MATERIALS AND METHODS Ninety samples of heat-polymerized acrylic resin were divided into 9 groups, consisting of impact strength, transverse strength and modulus of elasticity testing group. Each testing group consisting of group without and with addition of 1% and 1.5% E-glass fiber. Impact strength test was performed using Charpy impact tester, while transverse strength and modulus of elasticity were performed using the Universal Testing Machine. After the test, fracture surface of the samples was evaluated and scanning electron microscope view was taken. The effect of E-glass fiber addition to impact, transverse strength and modulus of elasticity on heatpolymerized acrylic resin was analysed with one-way ANOVA statistical test. Pearson Correlation test was then performed to determine the correlation between impact, transverse strength and modulus of elasticity. RESULTS There was an effect of E-glass fiber addition (chopped strands of 3 mm size) with 1% and 1.5% weight concentration to impact strength p=0.0001 (p<0,05); transverse strength p=0,002 (p<0,05); and modulus of elasticity p=0.002 (p<0.05). Pearson Correlation test showed that there was no correlation between impact and transverse strength (r=0.311 and p=0.094) (p>0.05); impact strength and modulus of elasticity (r=0.284 and p=0.128) (p>0.05); and transverse strength with modulus of elasticity (r=-0.044 and p=0.816) (p>0.05). CONCLUSION Addition of 1% and 1.5% E-glass fiber can improve the impact strength, transverse strength, and modulus of elasticity of heatpolymerized acrylic resin denture base and the addition of 1% E-glass fiber can increase a balanced of impact strength, transverse strength, and modulus of elasticity of heat-polymerized acrylic resin denture base.

Gigi tiruan sebagian lepasan (GTSL) merupakan pilihan perawatan yang efektif dan terjangkau pada kasus kehilangan gigi sebagian. Kebanyakan pasien dari segala usia memilih menghindari penggunaan logam pada perawatan GTSL karena menginginkan senyum yang cemerlang. Pada kehilangan gigi sebagian dengan gigi penyangga resesi gingiva, pembuatan GTSL resin akrilik konvensional menimbulkan masalah estetik karena cangkolan yang terlihat saat pasien tersenyum. Laporan kasus ini memaparkan penatalaksanaan kehilangan gigi sebagian dengan GTSL kerangka logam kombinasi bahan fleksibel pada kasus gigi penyangga resesi gingiva. Pasien perempuan, berusia 70 tahun datang ke RSGMP FKG USU dengan keluhan ingin dibuatkan gigi tiruan rahang atas dan bawah yang terbaik, gigi depan rahang bawahnya goyang sejak 8 tahun yang lalu, pasien tidak ingin terlihat ompong sebelum gigi tiruannya selesai. Pemeriksaan intra oral menunjukkan gigi yang hilang pada rahang atas 17, 25, 26; rahang bawah 37, 38, 45, 46; 15, 27, 28 ekstrusi; 24 resesi gingiva dan 31 mobiliti derajat II, 41 mobiliti derajat III. Penatalaksanaan kasus untuk rahang atas adalah dengan GTSL kerangka logam kombinasi bahan fleksibel dan GTSL imidiat resin akrilik untuk rahang bawah. Cangkolan wrap around pada gigi penyangga 24 dengan prinsip retento-grip tissue-bearing retention berfungsi sebagai lengan retentif sekaligus menutupi resesi gingiva, cangkolan akers pada 16 memaksimalkan retensi dan konektor mayor anterior-posterior palatal strap berfungsi untuk mendistribusikan beban ke gigi penyangga dan jaringan pendukung serta memberikan kenyamanan pada pasien. Perawatan kasus dengan GTSL kerangka logam kombinasi bahan fleksibel memiliki keuntungan yang diperoleh dari bahan fleksibel dimana lengan retentif menutupi resesi gingiva sehingga estetik tercapai dan kerangka logam menjadikan gigi tiruan lebih kaku, kuat dan stabil.selanjutnya dan kesuksesan perawatan ortodonti itu sendiri.