Need help disabling destructive items/blocks with PEX

[N0vaGam3r]

I have a server that untill reacently i thought was protected. Now, i found out that players still could place destruction cataclyst's and other explosives, still after i added the: "-

modifyworld.blocks.place.<blockid>" permission.

I would be really glad if anyone could help me on this one. For the moment, the server is whitelised, so if you can help, tell me you'r ingame name.