Table 2. Descriptive statistics and the results of Student’s t-test for cell viability (%) comparisons of L929 cells ex-posed to extracts of conventional and TiO₂-containing adhesives .

Groups	Day 1	Day 3	Day 5	Day 7	Day 14
	Mean±SD	Mean±SD	Mean±SD	Mean±SD	Mean±SD
Transbond XT	63.1±5.9	70.5±6.9	78.9±3.9	90.6±6.1	99±10.9
TiO2-containing Transbond XT	60±6.3	66±7.5	80.2±3.5	93.5±2.9	99.8±9.3
Statistical comparison	P=0.154	P=0.246	P=0.450	P=0.195	P=0.665