EFFECT OF NON DENTAL GLASS FIBER ORIENTATION ON WATER SORPTION AND TRANSVERSE STRENGTH OF FIBER REINFORCED COMPOSITE

KHALIL, ABDULGHANI, Prof. Dr. drg. Widowati S., M.S; Dr. drg. Siti Sunarintyas, M.Kes

2015 | Tesis | S2 Ilmu Kedokteran Gigi

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Recently FRC is widely used in dentistry especially for dental bridges. E glass fiber is commonly used because it increases the mechanical strength, has good bonding with polymers via silane coupling agent and insensitive to moisture which reducing the mechanical properties of Fiber Reinforced Composite. The availability of dental glass is limited and its price quite expensive in Indonesia. Non dental glass fiber is available in Indonesia with lower price, it is widely used to make sculpture, panel gypsum and automotive component. The aim of this research was to evaluate the effect of non dental glass fiber orientation on water sorption and transverse strength of fiber reinforced composite. The materials used in this research was Non dental glass fiber (HJ, China) with two orientations (Roving as unidirectional and Woven roving as bidirectional), Flowable composite (CharmFil Flow, DenKist, Korea) and Silane Coupling agent (Monobond S, Ivoclar Vivadent, Liechtenstein). This study was performed twenty four specimens of non dental glass fiber reinforced composite, divided into 4 groups; 2 groups of orientations for water sorption and 2 groups of orientations for transverse test. Water sorption and transverse strength was carried out according to ISO 10477:2004. The results was analyzed with Independent sample T-test. The results showed that the mean of water sorption (μg/mm3) was (0.0157 ± 0.001033) for unidirectional orientation and (0.0147±0.000816) for bidirectional orientation. The mean of transverse strength for 24 hours was (152.998±8.767) MPa for unidirectional and for bidirectional was (178.436±23.362) MPa. The mean of transverse strength for 7 days was (133.623±30.180) MPa for unidirectional and for bidirectional orientation was (145.373±35.859) MPa. T-test analysis showed for water sorption there is no statistical difference between Roving and Woven roving orientation (p> 0.05). for transverse strength with 24 hours there is a significant difference between Roving and Woven roving orientation (p< 0.05), but for the data of 7 days there is no statistical difference the groups (p> 0.05). Conclusion of this study: with two orientations of non dental glass fiber there is no different water sorption. While there is different transverse strength between non dental glass fiber roving and woven roving in fiber reinforced composite.

Kata Kunci : fiber reinforced composite, Non dental glass fiber, fiber orientation, water sorption, transverse strength.