Table 1.
Means (standard deviations) of the relative contrast of the four tested materials at the 11 thicknesses
| Thickness (mm) | Materials | |||
|---|---|---|---|---|
| Acrylic | Wood | Utility wax | Water | |
| 4 | 0.57 (0.02) A ab | 0.57 (0.05) A a | 0.64 (0.02) A a * | 0.62 (0.01) A a * |
| 8 | 0.59 (0.03) A a | 0.57 (0.06) A a | 0.63 (0.01) A a * | 0.59 (0.01) A ab |
| 12 | 0.51 (0.02) A abc | 0.58 (0.07) A a | 0.55 (0.06) A ab | 0.54 (0.00) A abc |
| 15 | 0.47 (0.02) A abcde | 0.52 (0.02) A ab | 0.59 (0.08) A ab | 0.53 (0.00) A abcd |
| 20 | 0.44 (0.00) A bcde | 0.55 (0.02) A ab | 0.55 (0.02) A abc | 0.45 (0.01) A bcd |
| 24 | 0.46 (0.00) A abcde | 0.49 (0.04) A ab | 0.53 (0.11) A abc | 0.47 (0.01) A bcd |
| 28 | 0.48 (0.02) A abcde | 0.42 (0.01) A b | 0.55 (0.01) A abc | 0.49 (0.01) A abcd |
| 32 | 0.47 (0.06) A abcde | 0.51 (0.03) A ab | 0.50 (0.02) A abc | 0.47 (0.01) A bcd |
| 36 | 0.43 (0.04) A cde | 0.43 (0.04) A ab | 0.47 (0.03) A bc | 0.47 (0.01) A bcd |
| 40 | 0.42 (0.02) A de | 0.51 (0.02) A ab | 0.46 (0.06) A bc | 0.44 (0.02) A cd |
| 45 | 0.36 (0.05) A e | 0.46 (0.04) A b | 0.42 (0.12) A c | 0.40 (0.01) A d |
Means followed by different lowercase letters in columns and uppercase letters in rows differ statistically among them (Dunnett's test; p<0.05).
*
Statistically different from the patient by the Dunnett's test