Inadequate Interproximal Bone Volume: Possibility of Bone Loss?

Dr. I. asks:
I replaced a missing upper first bicuspid with an implant 6 months prior. The interproximal bone between the dental implant and the cuspid anterior to it was approximately 1.25 mm. I uncovered the implant 3 months later and found it had successfully osseointegrated. I placed a standard abutment and temporary crown at that visit. 6 weeks later I took a radiograph and found that there has been no bone loss. The implant and cuspid are asymptomatic. Is there still a possibility of bone loss due to the pre-operative inadequate interproximal bone volume? How would you handle this?