Methods: The spraycaused mean surface deviations of a white (Dentaco Scanspray plus) and a blue (Dentaco Scanspray blue) scanspray were defined and compared with the paired t-test. Scansprays were used according to instructions. First spraycaused surface deviations on a planar surface were defined with a pertometer. Adjacent approximate clinical conditions were created by using an artificial head and dental prothesis with a chamfer preparation in toothregion 14, which was detected optically (Dentascope) and covered with scanspray. The spraycaused surface deviations were defined again.
Results: Within the limitations of this study mean deviations of both sprays on a planar surface were 12,71µm(SD:4,08µm). The white spray showed mean deviations of 12,68µm(SD:3,41µm) and differed not significantly (p=0,979) from the blue spray 12,73µm(SD:4,77µm). Under approximate clinical conditions mean surface deviations were 13,77µm (SD:23,32µm). The white spray caused mean surface deviations of 14,21µm (SD:27,34µm), the blue spray 13,33µm(SD:18,45µm) whereas statistically no significant differences were found (p=0,548). Both sprays showed mean deviations buccal of 12,17µm(SD:27,49µm), distal of 10,17µm(SD:21,33µm), palatal of 16,50µm(SD:29,32µm), mesial of 17,90µm(SD:20,53µm) and occlusal of 12,09µm(SD:13,98µm), while significant differences could only be detected between the buccal and occlusal surface area (p<0,001).
Conclusion: The evaluated mean surface deviations of 12,68µm on the planar surface and 14,21µm under approximated clinical conditions for the white scanspray and 12,73µm on the planar surface and 13,33µm under approximated clinical conditions for the blue scanspray are clinically acceptable. Because of small absolute differences of mean surface deviations there are no advantages in using a white over a blue scanspray.