Impact of video instructions and additional hands-on instructions on the dental flossing performance - an...

This study aimed to evaluate the effectiveness of an instruction-video, with and without additional hands-on instruction, in teaching young adults proper flossing performance.

This randomised intervention and observational study included 94 participants, 24 (23; 25) years, receiving an instruction-video with (group 1) or without additional hands-on instruction (group 2). The flossing performance was assessed by videotaping before instruction (T1), after instruction and one week of practice (T2), as well as after two weeks of practice (T3). Parameters of interest were number of interdental spaces reached, adaptation to mesial and distal surfaces, flossing technique, systematic approach and handling combined with self-assessment of flossing skills and time spent, assessed by questionnaires.

Additional hands-on instruction did not lead to a significant improvement in any parameter compared to video-instruction alone. At T1, the participants reached many interdental spaces, but only two managed to floss their entire dentition correctly. After video instruction (T2), the participants reached more interdental spaces (p = 0.039) using a systematic approach and improved adaptation, technique and handling (p < 0.001 each). Parameters improved again at T3, resulting in 42 participants flossing their entire dentition correctly. After instruction participants found flossing less difficult, although they estimated it took more time.

Video-instruction significantly improved flossing performance, whereas hands-on instruction had no additional benefit. This indicates that video-instruction could be an effective and timesaving tool to improve flossing performance.

The results emphasize the importance of appropriate teaching-methods in dental prophylaxis and highlight the potential of video-instructions to improve interdental cleaning skills significantly.