Table 1.

Tested groups and coding according to repair material reinforcement.

Group code	Repair material
HC	Intact heat polymerized specimens (control)
AP	Autopolymerized acrylic resin
2GF	Autopolymerized acrylic resin reinforced with 2 wt% glass fiber
5GF	Autopolymerized acrylic resin reinforced with 5 wt% glass fiber
2ZR	Autopolymerized acrylic resin reinforced with 2 wt% zirconia
5ZR	Autopolymerized acrylic resin reinforced with 5 wt% zirconia
2NZR	Autopolymerized acrylic resin reinforced with 2 wt% nano-zirconia
5NZR	Autopolymerized acrylic resin reinforced with 5 wt% nano-zirconia