That can do this now were specifically speaking of one kind of test this is a sheer test and it's not the most reliable or accurate test in the world but it does give us a very good indicator. Of where things row there's there's no test it is perfect we have other people doing a micro tensile type test and in fact those micro tensile type tests are now coming back with similar numbers. To this specific type of sheer test there's a lot of ways we can test bonds and this particular way seems to be one of our more effective ways of helping educate the do's and don'ts about. Bonding and when we are talking about Boston's we really have to remember the strength the tooth where bonding to and had what were doing to repair those. To repair back to its original strength in fact after this study is it true that a lot of research groups and universities started using the quote ultradense method of fine testing this is right.