Aim: To test the effect of reinforcement qualities of glass fibre in the repair of acrylic fractures. Methods: Four types of heat-curing acrylic resin test specimens were fabricated. The bottom and sides of the specimens were placed in stone to form a repair template. Lines were drawn 3.5mm on each side of the centring mark. The 45 degree-bevel joint margins were cut at these lines to simulate fracture and the centre section was discarded. A 1mm gap was created between the margins before repair with autopolymerising acrylic resin with and without glass fibre. Outcome measures: A three-point loading test was used to measure transverse strength, deflection and the modulus of elasticity of repaired acrylic resin joints. Results: The transverse strength of acrylic resins was increased with fibres. Conclusion: Glass fibre-reinforcement significantly increased resistance to deflection and increased the modulus of elasticity.