Two employees were attaching 8"" cement hose to surface cement hole. They were in basket of JCB to make hook up. Boom was extended out approx. 20' to reach pipe at cement hole when the basket boom tipped over & fell to ground approx. 25'. EEs were taken to Dr. & released to work. Injured EE chipped his 2 front teeth & on 10/9/06 he received 2 temp. caps making this reportable.