How Do I Determine if the Implants are Osseointegrated?

Authors

Dr. C. asks:
I have placed my first implants in the maxilla in # 4 [maxillary right second premolar], #6 [maxillary right canine], #11 [maxillary left canine] and #13 [maxillary left second premolar] sites. These are NobelBiocare Replace Select regular platform implants. The radiographs look great and there is no evidence of any pathologic radiolucent lesion. The soft tissue around the implants looks great. There is no evidence of anything being wrong. But how do I determine if the implants are osseointegrated? I am going to place 4 Locators and make a maxillary overdenture. I do not want to proceed unless I am sure that they have osseointegrated?