Table 2.

Type, particle size, manufacturer and lot numbers of the polishing wheels used in the study

Polishing wheels	Type	Sub Type	Particle Size	Manufacturer	Lot #
Twist Dia (TWD)	Two-step rubber wheel polishing system	Pre-polisher	Diamond particles embedded rubber spirals. Medium grit (25–35 μm)	Noritake, Japan	462,857
		High-shine polisher	Diamond particles embedded rubber spirals. (Fine grit 4–8 μm)
Nova Twist (NOV)	Two-step rubber wheel polishing system	Pre-polisher	Diamond particles embedded rubber spirals. (Medium grit)	President Dental, Germany	466,014
		High-shine polisher	Diamond particles embedded rubber spirals (Fine grit)		458,792