Yorkie

6ml Thin bed solid bed will give 100% coverage essential for wet areas (tapered v notch) the distance between the end of the tooth to the neighbouring tooth is half the distance of the depth ie: 6ml depth and distance to neighbour being 3ml ,when pressure is applied adhesive beds out forming a continious solid bed.
6ml square notch is different as the distance between the neighbouring tooth is the same as the depth ie: 6ml, when pressure is aplied it doesn't form a continious bed and gives a covering between 50-75% as mentioned.
Hope that makes sense.