TABLE 1. Acrylic resins and polymerization cycles used in this study.

Material	Lot number	Manufacturer	Polymerization cycle
Onda-Cryl (clear microwave-polymerized acrylic resin)	404050	Artigos Odontológicos Clássico Ltd, São Paulo, SP, Brazil	A: Microwave oven: 500 W for 3 min
Onda-Cryl	404050	Artigos Odontológicos Clássico Ltd	B: Microwave oven: 90 W for 13 min + 500 W for 90 sec
Onda-Cryl	404050	Artigos Odontológicos Clássico Ltd	C: Microwave oven: 320 W for 3 min + 0 W for 4 min + 720 W for 3 min *
Clássico (clear conventional heatpolymerized acrylic resin)	404050	Artigos Odontológicos Clássico Ltd	T: Conventional water bath: 74°C for 9 h
Jet (clear autopolymerizing acrylic resin)	404050	Artigos Odontológicos Clássico Ltd	Q: Press chamber: 50°C for 15 min at 2 bar

^*Cycle recommended by Onda-Cryl manufacturer.