“…There were 12 studies that used the Vita classic shade guides, 5 of which reported significantly better performance of females 49–52,54 and 7 reported no significant difference, 1,5,19,42,44,45,47 Vita 3D Master was used by 12 studies, of which 4 reported significantly better performance of females 18,53,56,57 and 8 reported no significant difference 9,14,17,32–34,36,46 . Two studies used Vita linear guide 3D Master, both reporting no significant difference 30,39 . The combination of Vita classic and Vita 3D Master was employed by 5 studies, of which 3 reported no significant difference 37,40,43 and 2 reported significantly better female performance 48,55 .…”