Role of CO₂ Laser on SBS between Dental Porcelain and Composite Resin Repair Process

Table 2

ANOVA and LSD test for surface roughness between different groups.

Tested groups	Roughness before mean ± SD	Roughness after mean ± SD	P-value
HF	0.59 ± 0.05	B 1.33 ± 0.09	0.001 HS
CO2	0.58 ± 0.05	C 1.06 ± 0.09
CO2 + HF	0.59 ± 0.05	1.58 ± 0.07

The letters (A, B, and C) represent the levels of significance in LSD, highly significant start from the letter (A) and decreasing with the last one. Similar letters mean there are no significant differences.