Effect of CO2, Nd:YAG and Er:YAG Lasers on Microtensile Bond Strength of Composite to Bleached-Enamel

Table 1: Distribution of experimental groups.

Group number	Group name	Type of surface treatment
Group 1	NB-Si	No bleaching
Group 2	NB-As	No bleaching + sodium ascorbate
Group 3	NB-Er	No bleaching + Er:YAG laser
Group 4	NB-Nd	No bleaching + ND:YAG laser
Group 5	MB-CO₂	No bleaching + CO₂ laser
Group 6	HB-Si	Home bleaching
Group 7	HB-As	Home bleaching + sodium ascorbate
Group 8	HB-Er	Home bleaching + Er:YAG laser
Group 9	HB-Nd	Home bleaching + ND:YAG laser
Group 10	HB-CO₂	Home bleaching + CO₂ laser
Group 11	OB-Si	Office bleaching
Group 12	OB-As	Office bleaching + sodium ascorbate
Group 13	OB-Er	Office bleaching + Er:YAG laser
Group 14	OB-Nd	Office bleaching + ND:YAG laser
Group 15	OB-CO₂	Office bleaching + CO₂ laser

Abbreviations: NB, No Bleaching; HB, Home Bleaching; OB, Office Bleaching; Si, Single Bond 2; Nd, ND:YAG Laser; Er, Er:YAG Laser; CO₂, CO₂ Laser; As, Sodium Ascorbate.